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Electrical House Wiring Installation Pdf9/18/2023 The blue ones are travelers that might be in the switches at both the top and bottom of a staircase to control the same light. electrical installations for buildingsother thandwellings. Blue and yellow wires, although not usually found in non-metallic (NM) cable, are sometimes used as hot wires in an electrical conduit. SECTION EIGHT - WIRING SYSTEM: CABLES IN CONDUIT, TRUNKINGAND DUCTING.Bare copper wires are the most common type of grounding wires.Green wires can only connect to other green wires but can still be live if the electrical system is faulty. Green wires connect the grounding terminal in an outlet box and run it to a ground bus bar in the electrical panel, giving current a place to escape to the ground in the event a live wire touches metal or another conductor.The tape just lets you know that the white wire, which is normally neutral, is being used as a hot wire instead. White wires wrapped in black or red electrical tape are also hot wires.Don’t let the “neutral” part fool you because they can still carry a charge-especially if the current load is not balanced. White and gray wires are neutral wires that connect to the neutral bus bar, which attracts current and carries it throughout the house.
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