3 Phase Wire Color Code Usa. Phase 3 phase 3 wiring should be yellow. Neutral neutral wires should be grey. Any other colors except these may be used for other power lines.
For a single phase supply red or brown is used for line and black or sky blue is used for neutral. For a three phase supply red white and blue colours are used. Phase 2 phase 2 wiring should be orange. These are the wire color coding standards that are used in the united states.
For a three phase supply red white and blue colours are used.
Usa wiring color codes for dc supply. Phase 3 phase 3 wiring should be yellow. 3 277 480 volt ac wiring color codes in usa. Brown orange and yellow are used for 480 vac. For earth or protective conductor green yellow or green or bare copper conductor can be used.