San Francisco has deleted language from the 2010 California Electrical Code from this paragraph.210.5(C). Ungrounded Conductors. Each ungrounded conductor of a branch circuit shall be identified by phase or line and system at all termination, connection, and splice points. The means of identification shall be permitted to be by separate color coding, marking tape, tagging, or other approved means. The method utilized for conductors originating within each branch-circuit, panelboard or similar branch-circuit distribution equipment shall be documented in a manner that is readily available or shall be permanently posted at each branch-circuit panelboard or similar branch-circuit distribution equipment.
Conductor insulation shall contain continuous color pigment for circuit wire #14 AWG through #10 AWG. Ungrounded conductors #8 AWG and larger and ungrounded conductors of any size in cable assemblies may be suitably identified at pull junction and outlet boxes.
Conductor insulation shall be:
(1) 120/240 volt 3-wire circuits – “A” phase black, “B” phase red; 120/208 volt 4-wire 3-phase wye circuits – “A” phase black, “B” phase red, “C” phase blue; 120/240 volt 3-phase delta circuits – “A” phase black, “B” (high leg) phase purple, “C” phase red; 277/480 volt 4-wire 3-phase wye circuits – “A” phase brown, “B” phase orange, “C” phase yellow. Ungrounded conductors for other voltages shall be identified by different color coding, marking tape, tagging, or other approved means.
See Section 200.7 for limitations on re-identification of white or grey conductors.
(2) Conductors for switch legs may be of a different color than the ungrounded circuit conductor when suitably identified at pull, junction and outlet boxes with marking tape, tagging or other equally effective means. The color green, white or grey shall not be used for identification.
Exception: Extensions of existing non-color coded wiring systems need not be color coded.