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(a) Means shall be provided to isolate each circuit breaker or circuit breaker installation from all sources of potential.
(b) The isolating means shall provide a visible gap in the electrical circuit adequate for the operating voltage.
(c) Isolating or disconnecting switches (with no interrupting rating) shall be mechanically interlocked with the circuit breaker or shall be provided with prominently displayed caution signs in accordance with Section 2835 to prevent switching load current.
(d) The isolating means shall be permitted to be individually or group operated.
(Title 24, Part 3, Section 3-710-21(a)(11).)
NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
1. Editorial correction filed 11-2-83 (Register 83, No. 45).
2. Editorial correction of subsection (c) filed 11-3-83 (Register 83, No. 45).
3. Amendment of subsection (d) filed 12-10-87; operative 1-9-88 (Register 88, No. 1).