Grounding Screw
(A green screw specifically used to connect a ground wire to a metal electrical box)
Toggle
(Opens and closes the electrical circuit)
Single Pole Switch
Switch Variations:
Push button, toggle, illuminated switch, rocker, tamper resistant, voltage class, mercury switch, pull-chain/ pull-chord, dimmer switch, and electronic switch.
Terminal Screws
(Type of electrical connector where a wire is held by the tightening of a screw)
A light switch is a switch most commonly used to operate electrical lights, permanently connected equipment, and/or electrical outlets. The first light switch that used “quick-break technology” was invented by John Henry Holmes in 1884 in Newcastle, UK. The “quick-break” switch overcame the problem of a switch’s electrical current flowing through the air between the conductors (electric arcing) whenever the circuit was opened or closed.
Double Push Button Switch
1800’s
The double push button light switch has 4 buttons, one set that closes the line and one set that opens the line. Pushing the raised button opens/ closes the electrical circuit and pops out the sunken button so the process is reversed. In the U.S., the buttons were commonly black but the “on” button typically had a white “mother-of-pearl” (real or fake) piece in the middle to show its function. The switch was customarily installed with the “on” button on top. Push-button switch reproductions are available on the market today for vintage or authentic styling.
The chain ed Bridgeport, 1896. trolled An attached switch: on off. of a ceiling wall es switches. either or (off, speed,
Pull Chain Switch
1890’s
The first patent for the pull chain switch was awarded to Harvey Hubbell of Bridgeport, Connecticut in 1896. A pull switch is controlled by a chain or string. An electric pull switch is attached to a toggle type switch: one pull to switch on and next pull to switch off. The most common use of a pull switch is to operate a ceiling electric light. The ceiling fan and mechanical wall fans are also appliances often operated by pull switches. Pull switches are either two-position (open or closed) or multi-position (off, low speed, medium speed, and high speed).
Sierra Despard Switch
1940’s
These momentary low voltage switches are used with only copper wiring and three quick connect terminals on the back for easy installation . Sierra electric low voltage light switches, switch plates, and relays were installed in mid-century homes, built between 1940 and 1980, and were also known as “Square D” or Despard low voltage switches. Sierra Electric Company went out of business in the early 1980’s and was purchased by Pass & Seymour.