6
Completing System Installation
Once PV systems are installed, they are inspected and commissioned to verify the installation matches the plans and code requirements, and to verify that performance expectations are met.
6.1
Commission the System
Commissioning of PV systems follows similar requirements to any electrical installation, involving visual observations, testing and measurements to verify the safety and quality of the installation in accordance with the plans and applicable codes and standards, and to verify the proper operation and performance of the system. Key steps of a commissioning procedure include: • • • • • • • •
Completing final installation details Completing a system checkout and visual inspections Verifying wiring insulation integrity and proper termination torques Completing system documentation and labeling requirements Perform initial start-up and operations Demonstrate and verify shutdown and emergency procedures Verifying expected output and performance Conducting user training and orientation
A final checkout confirms that the installation is complete before beginning operations. A punch list can help check off items as they are completed, and should include the following items: • • • • •
Verifying disconnects are open and lockout/tagout procedures are in place Visually inspecting all components and connections (structural and electrical) Verifying terminal torque specifications and insulation integrity Verifying consistency of overall installation with system design and code compliance Identifying and completing any unresolved items
Numerous markings, labels and signs are required to identify PV systems and their components, and to warn operators, service personnel or emergency responders of hazardous conditions. Manufacturer markings and labels identify the size, type, specifications and ratings for PV modules, inverters, controllers, combiner boxes, conductors, raceways, overcurrent devices, switchgear and all other electrical components. These markings are placed on the product at the time of manufacture, and include listing marks from the testing laboratory, such as UL. Code officials may verify these markings during final inspections, and use them for the basis of their approval. Additional markings and labels are required for the overall system and certain components, and are to be provided and placed by the installer. These include additional labels on conductors, connectors, conduits, disconnecting means, and at the point of utility connection. Special labeling is also required for bipolar arrays, ungrounded PV arrays,
108 • NABCEP PV Installation Professional Resource Guide
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