Us ac power circuit wiring color codes. Phase 1 phase 1 wiring should be brown.
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The international electrotechnical commission or iec has established a wire color code for most european countries for ac branch circuits.
Ac wiring diagram colors. Ground ground wiring should be green or green with a yellow stripe. Phase 1 brown phase 2 black phase 3 grey neutral blue ground green with yellow stripe. The colors adopted as local practice are shown in table below.
These are the wire color coding standards that are used in the united states. Black red and blue are used for 208 vac three phase. Brown orange and yellow are used for 480 vac.
It is better to take a good up close photo of the old thermostat and what terminals the colored wiring are terminated. Phase 2 phase 2 wiring should be orange. Conductors larger than 6 awg are only available in black and are color taped at the ends.
Us nec ac single multi phase wiring color codes the mandatory colors for power wiring in national electric codes nec are green bare or green yellow yellow strip or band on green for protective ground pg and white alternatively grey for neutral wire. Neutral neutral wires should be grey. Canadian ac wiring color codes.
Phase 3 phase 3 wiring should be yellow. Basic thermostat wiring colors air conditioner systems always remember when changing a thermostat for a new thermostat to take a photo of the colors and where they go on the old thermostat or get a pencil and paper and write it down.
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