110.15 High-Leg Marking.
San Francisco Building Inspection Commission Codes · 2022 edition · ingested 2026-07-08 · San Francisco
110.15 High-Leg Marking. On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, only the conductor or busbar
← having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is [ ] purple in color or by other effective means. Such identification shall be placed at each point on the system where a connection is made if the grounded conductor is also present.
Information Note: Identification of Ungrounded Branch Circuit Conductors & Feeder conductors shall comply with Section 210.5(C)(1) Branch Circuits Supplied from More Than One Nominal Voltage System & 215.12(C)(1) Feeders Supplied from More Than One Nominal Voltage System.
110.26(A)(3) Revise this section as follows:
(3) Height of Working Space. The work space shall be clear and extend from the grade, floor, or platform to a height of 2.0 m (61/2 ft) or the height of the equipment, whichever is greater. Within the height requirements of this section, other equipment that is associated with the electrical installation and is located above or below the electrical equipment shall be permitted to extend not more than 150 mm (6 in.) beyond the front of the electrical equipment.
Exception No. 1: On battery systems mounted on open racks, the top clearance shall comply with 480.10(D).
Exception No. 2: [ ← ] [Exception deleted by local amendment.]
Exception No. 3: Meters that are installed in meter sockets shall be permitted to extend beyond the other equipment. The meter socket shall be required to follow the rules of this section.
110.26(B) Revise this section as follows:
(B) Clear Spaces. Working space required by this section shall not be used for storage. When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be suitably guarded. The standing area of the workspace shall not contain obstructions, abrupt changes in grade, or irregularities.
Chapter 2. Wirin and Protection g
ARTICLE 210 – BRANCH CIRCUITS
210.5(C)(1)(a) Revise this section as follows:
(a) Means of Identification. The means of identification for conductors #8AWG or larger shall be permitted to be by separate color coding, marking tape, tagging, or other approved means. Conductors of any size in cable assemblies may be suitably identified at all termination, connection and splice points. Conductor insulation in raceways shall contain continuous color pigment for circuit wire sizes # 10 AWG and smaller.
Phase Identification Colors for Branch Circuits shall be as follows:
(1) 120/240 Volt 3-Wire Single Phase Systems – “A” Phase Black, “B” Phase Red.
(2) 120/208 Volt 4-Wire 3-Phase Wye Systems – “A” Phase Black, “B” Phase Red, “C” Phase Blue.
(3) 120/240 Volt 3-Phase Delta Systems – “A” Phase Black, “B” (High Leg) Phase Purple, “C” Phase Red.
Information Note: New Construction or Complete Remodel of an Existing Building
(4) 120/240 Volt 3-Phase Delta Systems – “A” Phase Black, “B” Phase Red, “C” (High Leg) Phase Purple.
Information Note: Partial Remodel of an Existing Building – i.e. Replace Main Electrical Service where “C” Phase is Purple, & Re-Connect Existing Panels.
(5) 277/480 Volt 4-Wire 3-Phase Wye Systems – “A” Phase Brown, “B” Phase Orange, “C” Phase Yellow.
(6) Ungrounded conductors for other voltages shall be identified by different color coding, marking tape, tagging, or other approved means.
(7) Branch Circuit Conductors for switch legs may be of a different color than the Ungrounded Circuit Conductor when suitably identified at pull boxes, junction boxes and outlet boxes with marking tape, tagging or other equally effective means.
Exception No 1: In Multi-Family Dwelling Unit Buildings supplied by 120/208 Volt 4-Wire 3-Phase Systems, within Dwelling Units supplied by 120/208 Volt 3-Wire Single Phase Systems, Ungrounded Branch Circuit Conductor shall be permitted to be “A” Phase Black, “B” Phase Red.
Informational Note: See Section 200.7 for limitations on re-identification of white or grey for Grounded Conductors, and 250.119 for prohibition on using Green for Ungrounded Conductors.
ARTICLE 215 – FEEDERS
215.12(C)(1)(a) Revise this section as follows:
(a) Means of Identification. The means of identification for conductor #8 AWG or larger shall be permitted to be by separate color coding, marking tape, tagging, or other approved means. Conductors of any size in cable assemblies may be suitably identified at all termination, connection and splice points.
Phase Identification Colors for Feeders shall be as follows:
(1) 120/240 Volt 3-Wire Single Phase Systems – “A” Phase Black, “B” Phase Red.
(2) 120/208 Volt 4-Wire 3-Phase Wye Systems – “A” Phase Black, “B” Phase Red, “C” Phase Blue.
(3) 120/240 Volt 3-Phase Delta Systems – “A” Phase Black, “B” Phase (High Leg) Purple, “C” Phase Red.
Information Note: New Construction or Complete Remodel of an Existing Building
(4) 120/240 Volt 3-Phase Delta Systems – “A” Phase Black, “B” Phase Red, “C” Phase (High Leg) Purple.
Information Note: Partial Remodel of an Existing Building – i.e. Replace Main Electrical Service where “C” Phase is Purple, & Re-Connect Existing Panels.
(5) 277/480 Volt 4-Wire 3-Phase Wye Systems – “A” Phase Brown, “B” Phase Orange, “C” Phase Yellow.
(6) Ungrounded conductors for other voltages shall be identified by different color coding, marking tape, tagging, or other approved means.
(7) Branch Circuit Conductors for Switch Legs may be of a different color than the Ungrounded Feeder Circuit Conductor when suitably identified at pull boxes, junction boxes and outlet boxes with marking tape, tagging or other equally effective means.
(8) In Multi-Family Dwelling Unit Buildings supplied by 120/208 Volt 4-Wire 3-Phase Systems, within Dwelling Units supplied by 120/208 Volt- 3-Wire Single Phase Systems, within Dwelling Units supplied by 120/208 Volt 3-Wire Single Phase Systems, Ungrounded Feeder Conductors shall be the following:
a) 120/208 Volt 3 Wire Single Phase “A” Phase Black, “B” Phase Red
b) 120/208 Volt 3 Wire Single Phase “B” Phase Red, “C” Phase Blue
c) 120/208 Volt 3 Wire Single Phase “A” Phase Black, “C” Phase Blue
d) Labeling Required at the Sub-Panel indicating which Phases Serve the Unit from the 120/208 Volt 4-Wire 3-Phase Multi / Meter Distribution System
Informational Note: See Section 200.7 for limitations on identification of white or grey for Grounded Conductors, and 250.119 for prohibition on using Green for Ungrounded Conductors.
Informational Note: See 210.5(C)(1) for additional information regarding Identification of Ungrounded Conductors.