San Francisco has deleted language from the 2010 California Electrical Code from this paragraph.(1) 600 Volts, Nominal or Less. Conductors of ac and dc circuits from separately derived systems, from separate services, or from separate utility meters shall not be permitted to occupy the same equipment wiring enclosure, cable or raceway with conductors from other systems, services, or meters. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure, cable, or raceway.
Exception No 1: For solar photovoltaic systems in accordance with Section 690.4(B).
Exception No 2: Conductors installed in accordance with Section 700.9.
Exception No. 3: Class 1, 2 or 3 conductors installed in accordance with Article 725.
Exception No 4: Conductors in auxiliary gutters connected to the separately derived systems, service equipment, or meter bank.
(FPN): See Section 725.136(A) for Class 2 and Class 3 circuit conductors.