EPS Magazine, July 2011

0711EPSpC1:Layout 1

7/6/11

3:34 PM

Page C1

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:44 PM

FOR FREE INFO, CIRCLE 1 ON READER SERVICE CARD

Page C2

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

FOR FREE INFO, CIRCLE 4 ON READER SERVICE CARD

3:44 PM

Page 1

0711EPSp02.qxd:Layout 1

7/7/11

11:56 AM

Page 2

CONTENTS

PUBLISHER

Danny J. Salchert OFFICE MANAGER

Anita Salchert NATIONAL SALES MANAGER

Jerry DiChiara jerryd@epsmag.net CREATIVE DIRECTOR

Derek Gaylard CONTRIBUTING WRITERS

John Olobri • Adam Beson CIRCULATION DIRECTOR

Pam Fulmer

12

FEATURES 6 Understanding Soil Resistivity Testing

By John Olobri

12

Copper Ensures Reliability, Power Quality at Boston Data Center Data Centers Differ from Most Other Industries in Electrical Power Reliability and Power Quality

CASE STUDY 26 University Lighting Control Systems: Extreme Reliability Systems Are In High Demand

By Adam Beson

DEPARTMENTS 30 Industry News 34 Product Focus 40 Ad Index ON THE COVER Photo courtesy of Copper Development Association

2

Electrical Products & Solutions • July 2011

PRESIDENT

Danny J. Salchert Executive and Advertising Offices 3591 Cahaba Beach Road Birmingham, AL 35242 toll free: 800.981.4541 phone: 205.981.4541 fax: 205.981.4544 www.epsmag.net • danny@epsmag.net Electrical Products & Solutions™ is published twelve times a year on a monthly basis by ABD Communications, Inc., 3591 Cahaba Beach Road, Birmingham, Alabama, 35242, USA. Electrical Products & Solutions™ is distributed free to qualified subscribers. Non-qualified subscription rates are $57.00 per year in the U.S. and Canada and $84.00 per year for foreign subscribers (surface mail). U.S. Postage paid at Birmingham, Alabama and additional mailing offices.

Electrical Products & Solutions™ is distributed to qualified readers in the electrical contracting industry.

Publisher is not liable for all content (including editorial and illustrations provided by advertisers) of advertisements published and does not accept responsibility for any claims made against the publisher. It is the advertiser’s or agency’s responsibility to obtain appropriate releases on any item or individuals pictured in an advertisement. Reproduction of this magazine in whole or in part is prohibited without prior written permission from the publisher.

POSTMASTER: Send address changes to ABD Communications, Inc., P.O. Box 382885 Birmingham, Alabama 35238-2885

PRINTED IN THE USA

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

FOR FREE INFO, CIRCLE 5 ON READER SERVICE CARD

3:45 PM

Page 3

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:45 PM

Page 4

FOR FREE INFO, CIRCLE 6 ON READER SERVICE CARD

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:45 PM

Page 5

FOR FREE INFO, CIRCLE 7 ON READER SERVICE CARD

0711EPSp06,08.qxd:Company Spotlight

7/6/11

3:51 PM

Page 6

2

PA PA RT RT 1 AR OF TI A CL E

FEATURE • AEMC® Instruments

Understanding Soil Resistivity Testing

By John Olobri, Director of Sales and Marketing, AEMC® Instruments

I

n my experience over the last fifteen years of teaching classes on ground resistance test methods and working with technicians and engineers in the field, I have seen surprisingly little understanding of the value of soil resistivity testing.

It is a rather easy test to perform and the results can save you a lot of time and effort later on.

In this article we will deal with the subject in two parts. In part one, we will discuss the methods and techniques of testing soil resistivity. In part two we will discuss what to do with the test results.

To accomplish this task you need a ground resistance test instrument capable of testing using four electrodes commonly referred to as a four point or four pole tester. You also need four auxiliary electrodes and four spools of wire.

Next you need to decide on which test method to employ. There are two methods that are commonly used, the Wenner and the Schlumberger. Of these two, the Wenner method is the more popular and easier to use for testing soil resistivity for a grounding electrode system. The Schlumberger method is more practical to

6

use when the task is to plot soil resistivity at several different depths, a requirement popular with geological surveying. In either method the results are represented by the Greek letter Roe (ρ) and are expressed in Ohm-Meters or Ohm-Centimeters representing the resistance of a cubic meter of soil. For this article we will concentrate on the Wenner method. If we observe one simple condition we can apply a very simple formula to obtain soil resis-

Electrical Products & Solutions • July 2011

tivity. This condition will be explained later. The simplified formula is ρ= 2πAR. Where: π is a constant = to 3.1414 A = the spacing of the electrodes (in meters will save time in obtaining the results without having to do a conversion) R = the resistance value of the test Before we get in to the actual test, first let’s look at soil composition. Soils made up of ashes, shale or Continued on page 8

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:45 PM

Page 7

FOR FREE INFO, CIRCLE 8 ON READER SERVICE CARD

0711EPSp06,08.qxd:Company Spotlight

7/6/11

3:51 PM

FEATURE • AEMC® Instruments loam tend to have the lowest soil resistivity. Soils made up of gravel, sand or stone have the highest soil resistivity.

Moisture content, temperature and salts also affect soil resistivity. Soil that contains 10% moisture by weight will as much as five times lower in soil resistivity than that which contains 2.5%. Soil at room temperature will be as much as four times lower in resistivity than that at 32 degrees. So the time of year that you conduct the test can play a major role in the results. Finally salt content factors in the results in a big way. Just changing the composition by 1% can reduce soil resistivity by as much as a factor of 20. Therefore a quick visual analysis of the job site can give you a good idea as to whether you can expect low resistance from the installed grounding electrode system made up of a single ground rod or if you will need to install several rods to achieve the needed results. These conditions should be written down and kept with the test results.

Temperature, moisture and soil type are easily identified. Salt content may be more difficult to determine.

Now we are ready to take some measurements. As most commercially available ground rods are 8 to 10 feet long, it makes sense to check the expected soil resistivity at a depth of 10 feet. Checking it at 20 feet is also a good idea for comparison.

Using the Wenner method you need to space the four electrodes out an equal distance from each other and spacing equal to the depth to be tested (See figure 1). If we are testing at a 10 foot Figure 2

8

Page 8

Continued from page 6

depth then the four electrodes need to be spaced in a straight line 10 feet apart. If we are testing at a 20 foot depth then the electrodes need to be spaced 20 feet apart and so on. The 2 outside rods are used to send and receive a known current at a known frequency (AC) and the 2 inside rods are used to measure the voltage drop. The instrument converts this information to a resistance measurement.

To properly get a good indication of soil resistivity of the grounding electrode site we should take five measurements and average them for the final answer.

We should take them in a square pattern and then one on an inside diagonal of the square (See figure 2).

Now to use the simplified formula described earlier we need to observe one rule. That is the depth of the test electrodes should be no more than 1/20th the spacing of the rods. For testing at a ten foot depth the electrodes should be placed

Electrical Products & Solutions • July 2011

no more than 6 inches in the ground.

Our rods are spaced 10 feet apart and only six inches in the ground. The instrument is ready to be connected to the rod.

We must connect the terminals of the instrument in sequence to the rod using the spools of wire provided (See figure 3).

Once the connections are made we can run the test. Turn the instrument on, place the selector switch in the soil resistivity test position and press the test button.

Observe and write down the resistance reading measured. Do the same for each of the 5 measurements. For our test example let’s assume that our average for the 5 measurements was 340 ohms.

Now apply the formula ρ= 2πAR= 2(3.1414) (3) (340) = 6408.46 ohmmeters.

Notice we converted 10 feet to 3 meters to simplify our math.

In part 2 of this article we will explain what to do with this test result. ❏

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:45 PM

FOR FREE INFO, CIRCLE 9 ON READER SERVICE CARD

Page 9

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:46 PM

Page 10

FOR FREE INFO, CIRCLE 10 ON READER SERVICE CARD

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:46 PM

FOR FREE INFO, CIRCLE 11 ON READER SERVICE CARD

Page 11

0711EPSp12-24.qxd:Company Spotlight

7/6/11

3:55 PM

Page 12

FEATURE • Copper Development

Copper Ensures Reliability, Power Quality at Boston Data Center Data Centers Differ from Most Other Industries in Electrical Power Reliability and Power Quality

Figure 1. Fifteen-foot ceilings at One Summer Street enable installation of 24” to 36” raised floors while maintaining ample overhead space for cable trays and racks.

D

on’t be misled by that Macy’s sign; behind it lies an 800,000 sq. ft. data center. Such centers have become a significant portion of the national electrical picture. Power reliability and power quality are exceptionally high.

Their robust copper wiring and grounding practices provide an example for every industry.

Data centers have quietly become a significant portion of the national electrical infrastructure. The Federal Government alone was operating more than 1,100 in 2009.1 Along with commercial facilities, the data centers are huge electric power users. The U.S. Environmental Protection Agency once projected that such centers would account for three percent of all electricity consumed in the country in 2011, but they surpassed that figure a year earlier. At a 10% cumulative annual growth rate (CAGR), consumption could double well

12

before the decade is out.2 Steve Collins, an Associate with Vanderweil Engineers, a leading engineering firm (see description below), estimates that the gross power consumed by these “server farms” will increase significantly as centers continue to proliferate and unit electrical loading in them rises to a projected 1,500 W/sq ft.

Data centers differ from most other industries in that electrical power reliability and power quality are exceptionally high.

A TIA 942 Tier 4-rated facility will have 100% reliability, but, allowing for human error, the standard allows or projects at least 99.995% average availability (0.4 h average annual downtime over five years), yet, the percentage is often higher than that.

High power quality implies stable, correct voltage with undistorted waveform. Equipment is correctly installed, rigorously maintained, and, not incidentally, dependent on miles of copper for reliability.

Electrical Products & Solutions • July 2011

All of which brings us to One Summer Street, an 800,000-sq ft data center located in Boston’s “Downtown Crossing”. Don’t be misled by that Macy’s sign; the data center occupies most of the 2½-acre, cityblock-size building, including systems infrastructure located in the basement levels and multiple roof areas. As a data center, its advantages include a potentially large nearby customer base; eight utility feeds from two substations for reliable power and service by no less than 40 national and international communication providers. The neutral colocation center is a true carrier hotel. It’s the largest and arguably the most significant data center facility in the entire New England region.

New Infrastructure The Markley Group built, owns and operates One Summer Street. The company is a leading data center developer with properties in the U.S. and Europe totaling more than three million square feet.

Markley Group acquired the 70-year-old Macy’s building in 1999 and has invested more than $150 million to create the kind of sophisticated infrastructure a facility of this importance requires. Continued on page 14

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:46 PM

Page 13

FOR FREE INFO, CIRCLE 12 ON READER SERVICE CARD

0711EPSp12-24.qxd:Company Spotlight

7/6/11

3:55 PM

Page 14

FEATURE • Copper Development

Figure 2. More than 30 generators and HVAC equipment nearly blanket the building’s 2½-acre, mulitiered roof. A total of 30 MW of emergency power plus more than 10 MW of rotary and battery UPS power ensure seamless transfer. Future build-out to 40 MW of generation will accommodate growing electrical loads.

Figure 3. Four of eight 13.8 kV-480 V utility transformers located in a vault at One Summer Street. A similar set of transformers in a separate vault form the other half of the double-ended utility feed.

Copper buswork seen at the upper left feeds distribution switchgear located in the basement. Utility ground straps are visible on the floor and rear wall.

Continued from page 12

That infrastructure is the subject of this case study. The building itself was exceptionally sound, with features such as secure walls and high ceilings not found in some purpose-built centers (Figure 1). Its large, multitiered roof area was ideal for emergency generators, chillers and related equipment (Figure 2). And, with Macy’s continuing to occupy the lower floors, the center itself is hidden in plain view not a trivial security consideration.

The building’s old electrical infrastructure was another story. Energy-hungry data centers didn’t exist 70 years ago, so totally new electrical, grounding, IT and HVAC systems had to be installed. Power density exceeds 400 watts per square foot. The Markley Group assigned the building’s makeover to Vanderweil Engineers, a Boston-based firm with more than 50 years’ experience with commercial, industrial and public facilities, including data centers. Besides design, Vanderweil undertook construction administration and oversight, recommended subcontractors, and even conducted detailed inspections during construction. They were also the systems-commissioning and integrated testing agents.

Figure 6. Power is fed to equipment cabinets via power distribution units (PDUs), seen here. Each PDU/cabinet is served by a minimum of two branch Fully Redundant circuits providing 2N redundancy. Copper Electrical Systems grounding conductors are run in ladder The building’s utility vaults are de- racks, above.

signed for a 20-MW electrical service, which is expandable to 40 MW. The vaults are dedicated to the data center.

Two entirely separate 13.8-kV, 10-MW utility feeds enter through the two vaults, each containing four liquid-cooled, 2,500kVA, 13.8 kV-480/277 V transformers, Figure 3. Three double-ended switchboards provide fully redundant services, referred to as the “A” and “B” circuits.

The data center has never experienced an outage, although it is fully protected should one occur.

The center’s 480-V power is distributed from the basement to server floors via ten 4,000-A copper bus risers. Four 5,000-A bypasses connected to the 6000-A rated switchgear enable load-switching among Figure 4. Switchgear (in cabinets, bottom) the riser feeds in the event one service should fail (Figure 4). Power bus risers and three of the ten 480-V, 4,000-A are physically separate from IT/data riscopper bus risers that feed power to ers in order to avoid electrical noise on upper floors (top of photo). Four 5,000-A bypasses enable switching among sensitive circuits. primary feeds.

Approximately one hundred 480 V14

Figure 5. Two (of more than 100) redundant 480 V-208/120 V distribution transformers feed customers’ servers and convenience outlets. All sub-distribution transformers are copper-wound, dry-type, K-rated, and meet NEMA TP-1 efficiency standards.

Electrical Products & Solutions • May 2011

208/120 V distribution transformers of various sizes feed servers and convenience outlets (Figure 5). Additional 480/277 V transformers serve lighting and HVAC requirements. All distribution transformers are copper-wound, dry-type, K-rated (mostly K13 and K20) units meeting NEMA TP-1 efficiency standards.

Individually fed power distribution units (PDUs) feed branch circuit panels and remote power panels (RPPs). For redundancy, branch circuits are extended to each server cabinet in an “A+B” configuration from two unique PDUs. The redundancy at the branch circuit improves reliability and permits either half of the electrical system to be shut down for maintenance without disrupting power (Figure 6).

Going Beyond the Code “Every Day” The National Fire Protection Association’s (NFPA) National Continued on page 16

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

FOR FREE INFO, CIRCLE 13 ON READER SERVICE CARD

3:46 PM

Page 15

0711EPSp12-24.qxd:Company Spotlight

7/6/11

3:56 PM

Page 16

FEATURE • Copper Development

Figure 7. The main grounding bar at One Summer Street is a three-foot by one-foot copper plate (right) located in the subbasement. All grounding conductors in the building’s two grounding system branches terminate here. The smaller bar at left rear is an extension of the larger bar.

Electrical Code® (NFPA 70: NEC) is concerned primarily with safety. It doesn’t fully address reliability or sensitive electronic equipment, which are dealt with in publications such as the Institute for Electrical and Electronics Engineers (IEEE) “Gold”3 and “Emerald”4 books, and the Telecommunications Industry Association standards5, among others. Data centers could not guarantee the levels of reliability and power quality required if they were designed and built to the Code’s minimum requirements. Electronic equipment especially IT and telecommunications equipment requires higher reliability and better power quality than the Code’s minimum standards provides for.

For example, Code-mandated wire sizes and voltage drop limits involve safety issues (overheating) but can also affect reliability and power quality. Don Esson is the Markley Group’s facilities manager at One Summer Street. “The NEC is a minimum standard,” he says, “and we supersede it every day in every project we work on.

Working strictly to Code practice, we would be running AWG #12 wire for a 20A branch circuit. Our standard is to run #10 instead. It can handle 1.5 times the ampacity; it’s more robust and therefore more reliable. Also, with #10, the customer has the built-in flexibility to upsize to 30-A receptacles in the future if he wishes. There’s very little increase in materials and labor costs, but reliability improves and you usually don’t have to upsize the conduit when upsizing copper, as you would with aluminum.

“We limit the number of outlets per branch circuit to between four and six, ex16

Continued from page 14

cept for IT circuits, which are one-on-one, or actually two-on-one since all IT branch circuits are double-ended: each receptacle contains two #10 phase conductors and a neutral conductor for the “A” circuit and two more for the “B” circuit, plus separate full-size grounding conductors.

“Voltage drop is another important consideration. We always bump up one conductor size, so if you had a 100-A feeder,

by Code you would typically run #4. We would probably run that with #2 wire. Voltage drop gets taken out of the equation at that point. The Code permits a two percent drop for feeders and three percent for branches, but we hold that to just two percent.”

Back-up Power The facility has approximately 20 MW of emergency generator capacity, and more than 10 MW of rotary (flywheel-type) and battery power in multiple UPS systems.

Power cables from generators and UPS systems are in multiple sets of 500–750-kcmil conductors. “Back-up power is extremely important for a facility such as this,” says Mr. Esson, “and, while value engineering may give us a choice to save on cost, it is important for us to utilize quality components to maintain system reliability. Equipment testing, commissioning and integrated testing, along with proper scheduled maintenance, are essential for these equipment items and systems.”

Single-point Grounding Christopher McLean, PE, LEED AP, is Vanderweil’s Electrical Engineer at One Summer Street. From his employer’s side, he’s been personally responsible for almost all of the power distribution improvements during the several years he’s been on the project. That responsibility includes the allimportant grounding system. Prior to the inception of the Markley Group’s ownership, tenants were all treated individually, which resulted in each tenant having their own electrical service entrance equipment, a scenario that created multiple ground current loops throughout the building.

“Grounding is critical in a data center,” says Mr. McLean. “Computer equipment is very sensitive to harmonics and high currents, so you want to isolate the equipment from transients, high frequencies and ground currents that might be placed on your grounding system at points of voltage

Electrical Products & Solutions • July 2011

and current transformation. We only have two levels of transformation, from 13.8-kV utility service to 480 volts and again from 480 volts to 208/120 volts, but they occur at hundreds of points where you’re connecting neutral to ground at transformers, switchboards and other separately-derived systems. Any of those points could feed transients, stray currents or harmonics back to the computer equipment. Our enforcement of a single-point grounding system prevents that.”

The single point Mr. McLean refers to is the center’s main grounding bar, a one-foothigh by three-feet-wide copper plate located in the building’s subbasement (Figure 7).

To that plate alone are bonded all ground leads from the building. There are actually two risers for the grounding system: one for the power distribution system, which includes generators, transformers and UPS equipment; the other for IT and communications circuits. Separating the two systems isolates IT/comm equipment from noise, harmonics and floating ground currents that may be present at ground-to-neutral bonds.

The two systems are bonded together only at the main grounding bar.

Extending “earthward” from the main grounding bar are multiple connections to building steel in walls and the subbasement floor, as well as to the water main on both sides of the meter. The building stands just 23 feet above sea level, making the floor and footings effective earthing points (Ufer grounds). Design ground resistance is five ohms.

Connections to building steel (including the basement floor) are made only from the main grounding bar. McLean explains that “All of the hundred-plus transformers throughout the building are connected to ground, plus we have many neutral-toground currents from unbalanced singlephase sources that ultimately put current to ground someplace. Had we connected to building steel from several points on the grounding system, the entire building steel system could have become one giant ground loop. That could compromise the ground-fault settings in switchgear and cause problems everywhere in the building.

By connecting from only one point — the main grounding bar in the basement — we’ve created a very robust grounding system that isolates those problems.”

Conduits are also bonded to the grounding system only at the Continued on page 18

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

FOR FREE INFO, CIRCLE 14 ON READER SERVICE CARD

3:46 PM

Page 17

0711EPSp12-24.qxd:Company Spotlight

7/6/11

3:56 PM

Page 18

FEATURE • Copper Development

Continued from page 16

Figure 8. Typical conduit runs at One Summer Street illustrate why the center relies on separate internal green wires rather than conduit itself as the grounding path. Copper is a better conductor than conduit steel. And, if conduits were used for grounding, thousands of connections and fittings would have to be inspected, torqued and tightened periodically, a hopeless task.

main grounding bar to create a complete system. However, and despite it being permitted by Code, conduit is never used as the only grounding conductor. McLean explains: “In almost all instances, conduit would not be an effective grounding path.

We always run at least one separate grounding conductor for each feed. Where we run two parallel feeds in the same conduit, each gets its own green wire. “One look at Article 250 in the Code would show you that the ampacity of the required copper grounding conductor is much higher than that of either galvanized conduit or electrical metallic tubing, EMT. Also, if we used the conduits as grounds, thousands of fittings and interconnections would then have to be inspected, torqued and tightened periodically, whereas a separate green wire only has to be inspected and torqued at the two end connections (Figure 8).”

FOR FREE INFO, CIRCLE 30 ON READER SERVICE CARD

18

Electrical Products & Solutions • July 2011

Grounding connections between the main grounding bar and the two grounding system branches are made through separate risers in the building’s corners, one for power distribution and one for IT equipment. Plans called for adding two more ground risers in the near future. Conductors from the main bar to the building floors are sized at 750 and 1,000 kcmil. They terminate at one-foot by three-foot copper grounding bars at each floor (Figure 9).

Smaller conductors lead from those bars to multiple four-inch by one-foot collector bars located high on walls throughout the floor space (Figure 10). Two sets of large and small grounding bars per floor serve power distribution and IT equipment, respectively.

Grounding Overhead and Underfoot Equipment racks are grounded by overhead and under-floor systems. For overhead systems, individual cabinets are grounded with AWG #6 or #4 Continued on page 20

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:46 PM

FOR FREE INFO, CIRCLE 15 ON READER SERVICE CARD

Page 19

0711EPSp12-24.qxd:Company Spotlight

7/6/11

3:56 PM

Page 20

FEATURE • Copper Development

Continued from page 18

Figure 10. Multiple grounding collector bars are mounted on walls in server rooms. The AWG 2/0 conductor, top, leads to the riser bar, while #2 green cable, bottom, is a collector bus for a row of cabinets. Conductor sizes vary with clients’ needs.

Figure 11. Green grounding conductors bond individual cabinets to an overhead collector bus. In this example, cabinet grounds are AWG #6 and the collector bus is #2, but larger sizes may be used.

collector bars serving the power distribution branch of the grounding system.

The raised-floor grounding system conFigure 9. A 1,000 kcmil grounding conductor (lower left) from the main sists of grids of AWG #2 and 4/0 bare copgrounding bar terminates at a ground bar per, (Figure 13). For approximately every serving one floor from one of the 3000 sq ft of raised-floor area, one 4/0 building’s two ground risers. Smaller the racks. It may range from #2 to 4/0 in grounding conductor is run from the grid to conductors bonded to the main floor bar size depending on need (Figure 11). the wall-mounted collector bar. (upper cables) lead to collector bars on Collector bus cables are directed to the the floor. nearest collector bar. The ladder racks Planned Maintenance Important leading to overhead ladder racks. Ground- themselves are also grounded via the bars One Summer Street clearly has well ing conductors from all cabinets in a row (Figure 12). Cable trays carrying 208-V thought out and executed electrical and are bonded to a collector bus cable run in power to servers are grounded to separate grounding systems, but Continued on page 22

FOR FREE INFO, CIRCLE 31 ON READER SERVICE CARD

20

Electrical Products & Solutions • July 2011

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:47 PM

Page 21

FOR FREE INFO, CIRCLE 16 ON READER SERVICE CARD

0711EPSp12-24.qxd:Company Spotlight

7/6/11

3:56 PM

Page 22

FEATURE • Copper Development

Figure 12. Overhead cable trays and ladder racks are jumpered and grounded with AWG #2 bare copper. These conductors, along with the cable bus that collects ground leads from individual cabinets, are connected to the nearest wall-mounted collector bar.

Continued from page 20

Figure 13. Bare copper grounding conductors are shown strung under a section of raised floor. Raised-floor grounding conductors from approximately every 3,000 sq ft of floor area are connected to a wall-mounted collector bar.

even these systems can degrade over time: pected effects. The electrical and ground- cording to a written program. Grounding Connections loosen, contact resistances ing systems at One Summer Street are, connections are checked for tightness on a rise and loads change, producing unex- therefore, inspected and maintained ac- fixed schedule and Continued on page 24

FOR FREE INFO, CIRCLE 32 ON READER SERVICE CARD

22

Electrical Products & Solutions • July 2011

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:47 PM

Page 23

FOR FREE INFO, CIRCLE 17 ON READER SERVICE CARD

0711EPSp12-24.qxd:Company Spotlight

7/6/11

3:56 PM

Page 24

FEATURE • Copper Development re-torqued as needed. Power quality is monitored to ensure clean waveforms and voltage stability. Emergency generators and UPS units are periodically exercised.

Systems are also regularly upgraded to meet changing needs.

Data centers are indeed mission-critical facilities with unique reliability and power quality requirements. Top-tier de-

Continued from page 22

signers and owners like Vanderweil Engineers and The Markley Group, respectively, clearly provide their clients with both of these elements at One Summer Street. The key components are not surprising: sound design, careful installation, attentive management, regular maintenance ... and the correct use of copper for circuitry and grounding. ❏

Endnotes Office of Management and Budget, www.scribd.com/doc/27535844/DataCenter-Consolidation-Memo-02-26-10 2 www.energystar.gov/ia/partners/ prod_development/downloads/EPA_ Datacenter_Report_Congress_Final1.pdf 3 The IEEE Gold Book: IEEE Standard 493, Recommended Practices for Grounding of Industrial and Commercial Power Systems, Institute of Electrical and Electronics Engineers, February 2007.

4 The IEEE Emerald Book: ANSI/IEEE 1100, Recommended Practice for Powering and Grounding Electronic Equipment. Institute of Electrical and Electronics Engineers, December 2005.

5 TIA-942: Telecommunications Infrastructure Standard for Data Centers, Ed. V, March 2010, Telecommunications Industry Association.

1

The Principals Donald J. Esson is the chief infrastructure engineer at One Summer Street. He can be reached at 617.451.2303 and at desson@markleygroup.com.

Stephen R. Collins is an Associate at Vanderweil Engineers and has been the project manager for the One Summer Street projects. He can be reached at 617.423.7423 and scollins@vanderweil.com.

Christopher K. McLean, PE, LEED AP, is an electrical engineer with Vanderweil Engineers assigned to One Summer Street.

He can be reached at 617.574.8184 and cmlean@vanderweil.com.

Founded in 1950, Vanderweil Engineers is a full-service engineering firm committed to developing innovative solutions and solid working partnerships. It has earned a 90% repeat business ratio and is consistently ranked among the top U.S. engineering firms. Vanderweil can be reached at www.vanderweil.com or (617) 423-7423 Over the past two decades, the Markley team has developed thirteen data center and telecom buildings throughout Europe and North America, with Markley's flagship facility located at One Summer Street in Boston. Markley Group can be contacted at www.markleygroup.com or (213) 622 3000. The Boston facility, in particular, can be contacted at (617) 451-6464.

FOR FREE INFO, CIRCLE 33 ON READER SERVICE CARD

24

Electrical Products & Solutions • July 2011

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

FOR FREE INFO, CIRCLE 18 ON READER SERVICE CARD

3:47 PM

Page 25

0711EPSp26-29.qxd:Company Spotlight

7/6/11

4:03 PM

Page 26

CASE STUDY • Nexlight

University Lighting Control Systems:

By Adam Beson

U

Extreme Reliability Systems Are In High Demand

niversities and school districts around the country are realizing the long-term investment potential of installing extreme reliability building control systems that optimize energy efficiency, provide simple to use occupant control, and deliver long term building performance with little or no maintenance.

HVAC, Security, Lighting, and Lighting Control systems manufacturers are all providing new and innovative solutions for green building environments. Savvy contractors who know what to look for when choosing products are going to benefit.

Lower installed costs, no callbacks, and lifetime reliability are all money saving features that are not to be ignored. This article will spotlight one universities latest building projects, outline the lighting control strategies, and provide insight to the major benefits and challenges faced during the construction and first year of use.

The University of St. Thomas in Minnesota, is the home of a new athletic complex on the school’s St. Paul campus. College officials say it was the biggest construction project in St. Thomas’ history. The $52 million facility called the Anderson Athletic and Recre-

26

ation complex completed construction on the 180,000-square-foot building in the fall of 2010.

The athletic center is approaching the 1-year anniversary of operation. Major elements of the facility include: 2,000seat basketball and volleyball arena

HVAC, Security, Lighting, and Lighting Control systems manufacturers are all providing new and innovative solutions for green building environments. aquatic center containing an eight-lane swimming pool, diving area, and spectator seating. Field house with 200-meter, six-lane track, four sport-courts on the interior of the track. Beneath the field house are locker rooms, meeting

Electrical Products & Solutions • July 2011

rooms, training rooms and other support facilities. The building west wing contains a fitness center, weight room and aerobics rooms on the first floor, and offices, classrooms and labs on the second and third floors. The university was very specific about their wants for the new control system. Facility Electrical Manager Dan Hoffman was involved in the lighting controls from day one. “We need a light control system that works all the time. Sounds simple, but we have issues in many of our buildings with other control systems. I don’t have time to chase them around all day,” says Hoffman.

The control for this building type uses four major strategies where applicable; time clock, occupancy sensors, daylight sensors, and local switching. All four technologies work together on a simple two-wire network toward simplified automated control and greater energy savings. This networked system uses relay panels, sensors, and switches all connected via a low voltage 2-wire system bus that is polarity neutral and topology free. Virtually eliminating incorrect Continued on page 28 wiring.

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:47 PM

Page 27

FOR FREE INFO, CIRCLE 19 ON READER SERVICE CARD

0711EPSp26-29.qxd:Company Spotlight

7/6/11

CASE STUDY • Nexlight

4:03 PM

Page 28

Continued from page 26

Multiple controls technologies work together to reduce overall energy consumption without disrupting daily activity

Time Clock The Astronomical time clock provides the first level of control. Exterior lights turn on 15 minutes before sunset and remain on overnight for security and safety, turning off 15 minutes after sunrise seven days a week. Interior lighting in the common areas and hallways are enabled during the hours of operation. After normal open hours, a “sweep” function in programmed to turn off lights accidentally left on every 90 minutes. Additional programming is set to accommodate for shortened summer hours, special events, and observed holidays to run for additional savings. Facility Manager and Electrical Specialist Dan Hoffman commented on the automated

Daylight sensors dim perimeter lighting to appropriate levels on sunny days.

system, “This lighting control system provides all of our staff and students with lighting when and where they need it.

Simply put, I need this building to operate reliably — this works.”

Occupancy Sensors For classrooms, bathrooms, closets and storage areas, occupancy sensors give additional savings by turning lights off during the day with inactivity. Control strategies like Off-delay times and sensor detection technologies used for the individual areas are different because of function, and frequency of use. Commissioning each area to maximize efficiency without disruption is essential. For example, the third floor is designated as staff office areas. Often working after normal building hours, coaches and staff offices stay illuminated and override the building time clock sweeps because of the occupancy detection. As the facility manager has learned nothing gets building occupants more upset than having lights go off on them. Hoffman said, “We quickly learned that occupancy sensors were a valuable solution to give staff hands free lighting after hours. No one is left in the dark.”

Daylight Sensors Commissioning and calibration of sensors ensures greater occupant satisfaction and energy efficiency.

28

Areas with lots of natural light during the day don’t need artificial lights on too.

Installing daylight sensors in the atrium, aquatic center, and along perimeter win-

Electrical Products & Solutions • July 2011

One 8-button switch provides control of the entire aquatic center.

dowed areas was a simple solution to provide additional control. Daylighting plays a significant role in LEED as well. Hoffman says occupants appreciate the building design and natural lighting, “Architects put in all these windows, the students are here all day rain or shine- its good to know that we don’t need to burn all those lamps while we have plenty of natural sunlight streaming in on nice days.”

0711EPSp26-29.qxd:Company Spotlight

7/6/11

4:03 PM

Page 29

Local Switching One of the most powerful elements of a networked control system is the local switching control. Programmable switches may control individual loads, groups of loads, or a preset pattern. Facilities like an athletic center benefit greatly from simplified control with a push of a single button. At St. Thomas, a security desk in the atrium is staffed during normal open hours; behind the desk are two eight-button switches provide centralized control of all the major areas of the facility.

ON/OFF control and monitoring is available for basketball arena, aquatic center, field house, fitness center, weight room and aerobics rooms. Building users can see just what lights are on because of the live status feedback (red and green LEDS) on every switch. “One switch that can set the scene for an event, that is what we Live status feedback tells staff when Game Mode lighting is on. have been looking for” said Hoffman.

Bringing it All Together

ple, 72 four-lamp fixtures provide lightComplex lighting systems and large ar- ing to a state-of-the-art field house sporteas are simple to control with a 2-wire ing complex. “The Field house is a great networked control system. As an exam- example of multiple control technologies working in concert,” says Hoffman. In regards to the design, he added “The large area is often broken up into small sections with motorized curtains for various sports activities, so zoned controls were essential.” As noted in the graphic the lighting control system created groups for each of the Courts (C1-C4), and a perimeter group for the outer track area. 8-button switches located in the locked storage closets provide local control of the field house for coaching staff and facility managers to adjust when necessary. In addition, both ends of the field house have large floor to ceiling windows, so daylight sensors were added to shed the lighting when the sun was shining (see yellow fixtures). Always flexible, this configuration is quickly modified or added to in seconds using the handheld wireless programming unit. Hoffman see lots of value in his new controls package, “Knowing I have the ability to modify the lighting controls at anytime is a real benefit, and its really fast and easy to do.”

Extreme Reliability Field house control of lighting loads and daylight sensors.

Fast forward almost one year after initial installation and use. Hoffman is sitting on the back wall of the field house watching a basketball team start a scrim-

mage, and a the track team prepare the indoor sand pit for long-jump. “These guys all get what they want” he says and smiles. “In the last year, these lights have been used in an uncountable number of configurations day and night. But the one-consistent factor is that when I push that button for ALL ON, or C1 Game, the right lights come on. And I get what I want.”

The real test of a quality system is the ultimate question to electricians who install it, engineers who specify it, and end users like Hoffman who use it every day; Would you use this product again? Hoffman pauses for a moment before responding, “Absolutely. In the 25 years I’ve worked at this university, this is the first controls system that has lived up to the hype. We have had no failures or broken equipment, its all operating like its day one.”

As the university prepares for its next construction project, another even larger NexLight lighting control system is currently being installed in St. Thomas’s latest building project, the Anderson Student Activities Center located just steps away from the Sports & Recreation Center. ❏ Adam Beson is the Director of Sales & Marketing at NexLight Lighting Controls. He can be reached by email at abeson@nexlight.com. www.nexlight.com July 2011 • epsmag.net

29

0711EPSp30-32.qxd:Company Spotlight

7/6/11

4:04 PM

Page 30

Industry NEWS

StacoVAR Power Factor Correction Equipment Specification from Staco Energy Products Now Available on MasterSpec® Staco Energy Products Co., is pleased to announce that StacoVAR Fixed and Automatic Switched Capacitor specifications are now available under “Section 263533 POWER FACTOR CORRECTION EQUIPMENT” on MasterSpec®. These specifications for 600 V and less Staco power factor correction products are now available for viewing or download at www.arcomnet.com. This web site, which is produced by ARCOM for the American Institute of Architects, is the industry leading site for specifications.

“We’re delighted to have our StacoVAR Power Factor Correction products featured on this industry leading site” said Staco VP of Sales & Marketing Dave Kendall. “Now it is easier than ever for engineers, designers, architects and spec writers to specify power factor correction equipment into their buildings and facilities up front. This not only saves energy, but also reduces their carbon footprint.”

Staco Energy Products Company manufactures voltage control, VAR compensation, uninterruptible power supplies and engineered power quality solutions. For more than seventy years, customers worldwide have relied on Staco as their dependable source for standard and tailored solutions to a wide range of electrical power problems. Headquartered in Dayton, Ohio, Staco Energy Products is a wholly owned subsidiary of Component Corporation of America, located in Dallas, Texas.

For more information, visit www.stacoenergy.com, call 866266-1191, write to Staco Energy Products Co, 301 Gaddis Blvd, Dayton, OH 45403, or e-mail to sales@stacoenergy.com. ❏

ILSCO® Connectors Installed in Cincinnati Zoo Solar Array Project The Cincinnati Zoo recently completed a project in which 6,400 solar panels were installed by ProtekPark Solar on a canopy structure over one of the Zoo’s parking lots. ILSCO’s TA-300 connectors were installed in forty-five combiner boxes which are used for electrical distribution and act as a termination point for each solar panel or array.

This solar panel array will generate 20% of the electricity used to power the Cincinnati Zoo which according to Thayne Maynard, Zoo Director, is “recognized as the greenest zoo in America…this new solar array …is the largest publicly accessible and urban solar array anywhere in America.”

Today, harnessing the sun to produce energy is at the forefront of renewable energy projects around the globe and ILSCO is grateful for the opportunity to provide TA-300 connectors in the completion of this project. ❏

30

Electrical Products & Solutions • July 2011

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:47 PM

Page 31

FOR FREE INFO, CIRCLE 20 ON READER SERVICE CARD

0711EPSp30-32.qxd:Company Spotlight

7/6/11

4:04 PM

Page 32

Industry NEWS

Rosendin Electric Promotes Sorauf, Frese, and Santos to Head Up Bay Area Regional Operations Rosendin Electric, the nation’s largest private electrical contractor and a 100% employee-owned company, today announced three new promotions for its Silicon Valley operations. Chris Sorauf has been promoted to Division Manager, Alan Frese assumes new responsibilities as Division Manager, and Gregory Santos has been named Operations Manager. These three promotions are part of Rosendin Electric’s ongoing growth strategy to accommodate new Bay Area business.

Chris Sorauf has been with Rosendin Electric for 16 years and has 32 years of experience in electrical contracting. Chris has been promoted to Division Manager of Santa Clara operations with focus on the high-tech industry and service work.

Prior to returning to the Bay Area to assume his new role, he was Division Man-

ager for the New Mexico region. Chris was formerly a Senior Project Manager for the San Jose office and has extensive expertise in pre-construction, with additional experience in Lean Project Delivery Systems, Nuclear Quality Assurance, and LEED® Certified construction.

Alan Frese assumes new responsibilities as Division Manager for Rosendin Electric’s San Jose Building Division which focuses on some of the larger projects in the Bay Area. Alan has been with Rosendin Electric for 12 years and has more than two decades of experience in the industry. During his tenure with Rosendin Electric, Alan has worked on design, management, and estimation of projects.

Gregory Santos has been promoted from Division Manager to Operations Manager for the Greater Bay Area. Greg joined

Rosendin Electric as an electrician in 1997 and has 23 years of experience in the industry. Since formally joining the company, Greg worked his way up from foreman to area superintendent, to project manager, division manager and now Operations Manager. He holds an electrical contractor’s license in 15 states for Rosendin Electric and a Bachelor of Science degree in Business Administration from California Polytechnic State University.

“As an employee-owned company, Rosendin Electric always looks within its ranks for managers who are superior performers and who understand how to promote our ongoing success,” said Rick Shandrew, Senior Vice President of Rosendin Electric. “Chris, Alan, and Greg are typical of Rosendin Electric’s management team – they are dedicated, smart, and committed to excellence and safety.

These promotions are in recognition of their contributions to the success of the company, and to help us continue to expand in our most important markets.” ❏ About Rosendin Electric Rosendin Electric, Inc., headquartered in San Jose, California, is a 100% employee-owned electrical engineering, power and communications provider and is the largest privately held electrical contractor in the United States. With over 2,000 employees and experience nationwide, Rosendin Electric has built upon a 90-year reputation for quality design and installations. For additional information, visit www.rosendin.com.

If you have industry news that you would like published in Electrical Products & Solutions magazine please email it to danny@epsmag.net for review.

FOR FREE INFO, CIRCLE 34 ON READER SERVICE CARD

32

Electrical Products & Solutions • July 2011

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

3:48 PM

Page 33

FOR FREE INFO, CIRCLE 21 ON READER SERVICE CARD

0711EPSp34-40.qxd:Company Spotlight

7/6/11

4:05 PM

Page 34

Product FOCUS EZ-FOLD™ Wall Mount Bracket Wall Mount Bracket is an alternative to the heavier and pricier wall mount racks. It provides similar functionalities – to mount panels and equipments in a confine space – with less cost. The traditional wall mount bracket is too bulky to store and it is costly to ship because of the size of its fixed arms. Some manufacturers attempted to reduce the space by folding two arms with hinges only to create another deficiency – weak arms. Two arms are needed to have enough strength to support heavy panels, cables and expensive equipments and hinging the arms makes it dangerous to bear extra weight. By hinging two arms, it also sways the entire bracket and makes it unstable.

The EZ-FOLD Wall Mount Bracket is designed differently. It can be folded to only 2.5 inches in height and installers can easily stack them in the truck or store them in small spaces. When it is unfolded, the arms will extent to 15 inches to accommodate most of the equipments, panels, and plenty of cable storage space. The EZ-FOLD has two hinges for folding purposes.

Once it is unfolded and securely mounted, the two hinges do not bear weight anymore. Both arms are supported by stud or backboard mounting screws. The weight limit is also strengthened by the double-row screw mounting.

Additional features: Available in 2, 4, 6 and 8 rack unit sizes Divided hinge allows easy access every 2 RU Heavy duty 16 gauge steel Bridge lances everywhere for cable ties Optional cover for top and bottom

FOR FREE INFO, CIRCLE 35 ON READER SERVICE CARD

34

Electrical Products & Solutions • July 2011

For more information, visit icc.com

FOR FREE INFO, CIRCLE 36 ON READER SERVICE CARD

0711EPSpFullPages.qxd:Company Spotlight

7/7/11

9:57 AM

Page 35

FOR FREE INFO, CIRCLE 22 ON READER SERVICE CARD

0711EPSp34-40.qxd:Company Spotlight

7/6/11

4:05 PM

Page 36

Product FOCUS Met-Con™ Flexible Conduit Connector Allows For Easy, Tool-Free Replacement of LED Lighting Modules Metal enclosure provides code compliant use in air handling space LED luminaires have shown dramatic improvements in performance in recent years, as well as energy efficiency. As a result, LEDs are undergoing a period of rapid growth in a variety of lighting applications, from street lighting to commercial down lighting. Although also known for long life performance, LEDs occasionally need replacement in the field due to failure or changing occupant needs, making replaceable modules essential to good luminaire design.

IDEAL today introduced the Met-Con™ connector especially designed for the LED market that houses its popular PowerPlug™ 182S 2-pole luminaire disconnect. Equipped with a connector latch, this unique protective enclosure enables electricians to easily replace LED modules located in the air handling space without the use of tools. Users simply pull down the module, undo the latch, disconnect the Met-Con to cut power from the luminaire, and make the replacement.

The Met-Con enclosure, which is made of zinc alloy and stainless steel, provides code compliance for use in spaces used for environmental air and complete metal enclosure for commercial lighting applications. It connects to flex conduit using standard industry screw capture for convenient installation at the OEM. While the latch easily opens without tools, when closed, it holds securely. The Met-Con is tested for use in Class 2 LED modules applications to UL 1598 Luminaires Standard.

The Met-Con Connector is exclusively designed to fit IDEAL 182S 2-pole disconnects for 18-22AWG wire sizes. The Met-Con is sold in quantities of 250 female (part #50-682SF) and 250 male (part #50-682SM) pieces.

For more information, visit www.idealindustries.com/products/oem

FOR FREE INFO, CIRCLE 37 ON READER SERVICE CARD

36

Electrical Products & Solutions • July 2011

FOR FREE INFO, CIRCLE 38 ON READER SERVICE CARD

0711EPSp34-40...#2.qxd:Company Spotlight

7/7/11

2:12 PM

Page 37

Cablo-Port – Innovative Solutions for Rooftop Pathway and Equipment Support Cablo-Port from Legrand/ Cablofil, is a UV and weather resistant rubber base that creates a cushion between rooftop mounted cable pathways, piping and HVAC equipment that can create leaks in sensitive roofing materials.

UV and weather resistant, Cablo-Port is available in Standard and Widebody base styles. The Widebody base minimizes roof pressure, provides a larger area for glue application and supports up to 1000 lbs. sq/ft. CabloPort features pre-mounted FAS P and Channel support options in Pre-Galvanized, Hot-Dipped galvanized and 304L Stainless Steel. Also available in a seismic rated series.

Cablo-Port is made of 100% recycled rubber to assist with building qualification for LEED credits and features a Reflective Safety Strip for visibility on dark roofs.

For more information, visit www.legrand.us/cablofil

FOR FREE INFO, CIRCLE 42 ON READER SERVICE CARD

FOR FREE INFO, CIRCLE 43 ON READER SERVICE CARD

July 2011 • epsmag.net

37

0711EPSp34-40.qxd:Company Spotlight

7/6/11

4:05 PM

Page 38

Product FOCUS Catamount® Twist Tail® Cable Tie Enables Trimming Excess Tail Without Tools New Product from Thomas & Betts doesn’t leave sharp edges The new Catamount® Twist Tail® Cable Tie from Thomas & Betts enables the installer to remove the tail end of the tie without the use of tools. The patented design allows the user to simply bend and twist off the tail after installation, leaving no sharp edges to scratch cables or hands.

“The Catamount Twist Tail Cable Tie enables installers to remove the excess tail without tools,” said Rachelle Weiss, product manager for Thomas & Betts. “This can save time since the installer needs only to grasp the excess tail between his thumb and forefinger, bend it in the other direction and twist. Plus, it doesn’t leave sharp edges.”

Available in white or ultraviolet-resistant black 6.6 nylon, the Catamount Twist Tail Cable Tie provides 30 pounds of minimum loop tensile strength, which is suitable for any light-duty cable tie application.

For more information, visit www.tnb.com

FOR FREE INFO, CIRCLE 39 ON READER SERVICE CARD

38

Electrical Products & Solutions • July 2011

FOR FREE INFO, CIRCLE 40 ON READER SERVICE CARD

0711EPSp34-40.qxd:Company Spotlight

7/6/11

4:06 PM

Page 39

AEMC® Introduces the NEW Simple Logger® II Model AL834 The Simple Logger® II Model AL834 is a 4-channel AC current data logger with four integral flexible current sensors. Each sensor is 24 inches long and capable of wrapping around an 8 inch conductor. The AL834 has two measurement ranges of up to 300 and 3000 Amps. Both the data logger housing and the current sensors are water resistant rated to IP 65. A selection of data storage modes, as well as data sampling rates is user programmable through the DataView® application software provided. Up to 1,000,000 measurements can be stored in internal nonvolatile memory. The Model AL834 is powered by four C cell alkaline batteries capable of providing six months or longer recording time. Data storage rates as fast as 8 per second are user programmable. Communication to the DataView® software is accomplished through wireless Bluetooth technology. The Bluetooth adapter, provided, facilitates this communication link.

APPLICATIONS:

Single/split phase and 3 phase monitoring Neutral and ground current monitoring Intermittent problem detection Harmonic current monitoring using DataView® software Machine load monitoring Fault current detection Load profiling For more information, visit www.aemc.com

ILSCO Introduces Waterpipe Ground Clamps ILSCO expands its offering of ground clamps to include Type GPL3, bronze waterpipe ground clamps. The GPL3 series fits IPS pipe sizes from ½” through 12” and accepts ground conductor sizes from 4 – 4/0.

The UL Listed and CSA Certified bronze clamps have silicon bronze hardware and provide superior corrosion resistance. The clamps rotate 90 for installation flexibility and are suitable for direct bury in earth or concrete.

For industrial construction, maintenance, power plants, substations and anywhere perimeter fencing is required to be grounded.

ILSCO is your ClearChoice® for electrical connectors.

For more information, visit www.ilsco.com

July 2011 • epsmag.net

39

0711EPSp34-40...#2.qxd:Company Spotlight

7/7/11

2:12 PM

Page 40

Advertiser INDEX This advertisers index is compiled as a courtesy to our readers. While every effort is made to provide a complete and accurate listing of companies, page numbers and reader service numbers, the publisher is not responsible for errors.

Company AEE SOLAR AEMC INSTRUMENTS ALBER CORPORATION ARPI OF USA BYTE BROTHERS CABLOFIL CONDUIT REPAIR SYSTEMS CONTINENTAL CONTROL SYSTEMS, LLC COPPER DEVELOPMENT ASSOCIATION EXTECH INSTRUMENTS/FLIR SYSTEMS E-Z METER GENERATOR INTERLOCK TECHNOLOGIES HIOKI USA ICC KRENZ & COMPANY LAPP USA MEGGER MH RHODES/CRAMER COMPANY

PG#

RS#

Company

11 1 10 36 24 22 4 34 13 3, 9 36 7 15 17 38 23 IFC 37

11 4 10 37 33 32 6 36 12 5, 9 38 8 13 14 39 17 1 42

MINUTEMAN UPS NEXLIGHT NORTHWEST LIGHTING SYSTEMS PANASONIC LIGHTING CONTROLS PG LIFELINK PHASE-A-MATIC PHILIPS EMERGENCY LIGHTING PLC BUILDINGS LIGHTING CONTROL SYSTEMS SOKKIA SOUTHWIRE COMPANY STEELMAN INDUSTRIES STRIP-TEC TASK LIGHTING THE HOME DEPOT UNDERGROUND DEVICES UTILITY METALS VERVE LIVING SYSTEMS

FOR FREE INFO, CIRCLE 41 ON READER SERVICE CARD

40

Electrical Products & Solutions • July 2011

PG#

RS#

25 27 31 35 IBC 38 32 40 5 33 34 18 37 19 20 21 BC

18 19 20 22 2 40 34 41 7 21 35 30 43 15 31 16 3

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

FOR FREE INFO, CIRCLE 2 ON READER SERVICE CARD

3:48 PM

Page C3

0711EPSpFullPages.qxd:Company Spotlight

7/6/11

FOR FREE INFO, CIRCLE 3 ON READER SERVICE CARD

3:48 PM

Page C4