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Comprehensive Guide to Electrical Switch Installation and Wiring Procedures

This guide outlines the essential procedures for installing electrical switches, making common splices, and performing various wiring tasks. It covers the installation of single pole, three-way, and four-way switches, each with its terminal requirements. The importance of following NEC codes, using appropriate conduit, and selecting the right wire for the environment is detailed. Specific splicing techniques like the rat tail splice and western union splice are explained, along with guidelines for using copper vs. aluminum wiring. Essential for both novices and professionals in electrical work.

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Comprehensive Guide to Electrical Switch Installation and Wiring Procedures

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  1. Objective 17.02 • Explain the procedure for installing switches, making common splices, and doing other electrical wiring tasks

  2. Installation Procedures • Single Pole Switches: • Toggle • Rocker arm • Push button • Silent • Type depends on use and location

  3. Installation Procedures • A light fixture uses two terminals • A single pole switch has two terminals • A three-way switch • Has three terminals • Uses two traveler wires • A black and a red

  4. Installation Procedures • A four-way switch has four terminals and can only be installed in between two three-way switches • It has four travel wires

  5. Installation Procedures • Electrical or wiring boxes musts be installed at every junction, splice, light, switch or outlet

  6. Installation Procedures • Certain NEC Codes require wires to be inside conduit. • Thin conduit may be cut with a hack saw or a metal cutter saw • NM cable is installed inside buildings

  7. Installation Procedures • Outdoor wire is selected based on use • UF: used to bury underground as feeder wire • USE is used to provide mechanical protection where wires enter and leave the ground • SE and SEU are used to bring electrical service into a building • TW is used to provide service in areas that have moisture

  8. Installation Procedures • The wire loop should be attached to a screw terminal in the same direction the screw turns

  9. Installation Procedures • A rat tail splice is used inside junction boxes • A western union splice is used where strength of the splice is required

  10. Installation Procedure • Copper wire is preferred • If aluminum is used, one size larger wire must be used to carry the same electrical current • Remember the smaller the number, the larger the wire

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