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Basic Electrical Wiring General Rules

Basic Electrical Wiring General Rules. Denham Springs Freshman Ag I. National Electrical Code (NEC). Boxes must be securely fastened to building Cable or conduit must be clamped securely to the box Metal boxes must be grounded. Ground wire must be attached by screw or clip.

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Basic Electrical Wiring General Rules

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  1. Basic Electrical WiringGeneral Rules Denham Springs Freshman Ag I

  2. National Electrical Code (NEC) • Boxes must be securely fastened to building • Cable or conduit must be clamped securely to the box • Metal boxes must be grounded. Ground wire must be attached by screw or clip. • Wires in boxes must be connected to each other using wire nuts. No bare areas on wires except ground wires. • If white wire is used as hot, mark it with black tape

  3. National Electrical Code (NEC) • Ground wires must be held together by metal clamp or wire nuts • Wires must be attached to terminals on switches and receptacles by tightening no more than one wire under one screw or spring clamp. • Positive/hot wires (black, red, or blue) are always attached to brass screws. Neutral wires (white) are attached to silver screws and ground (green) to green screws.

  4. Wiring Basics • Standard switch box holds only 4 wires, not counting ground wires. • Only strip a minimum amount of insulation off wires. Bare wire should not be visible out of the clamp, but insulation should not be under the clamp. • Hook wires under screw clamps in a clockwise fashion.

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