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When the load of an existing service entrance switch increases beyond its continuous current rating or continuity of service requires, a second service entrance switch of identical rating shall be permitted to be connected in parallel with it, provided:
(a) Each switch has interrupting capacity equal to or greater than the maximum fault current that can occur at its location.
(b) Each switch has its own overcurrent protection arranged to trip both switches automatically.
(c) Both switches have a common electrical or mechanical tripping arrangement.
EXCEPTION: Both switches need not have a common tripping arrangement if continuity of service requires that both switches not be tripped together, under fault conditions, and a suitable relay protection scheme is employed to separate faulted portions from the system.
(d) Both switches can be padlocked in the open position.
(Title 24, Part 3, Section 3-230-214.)
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. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).