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Feeders and branch circuits shall have a fault protective device in each ungrounded conductor. The protective device(s) shall be capable of detecting and interrupting all values of current in excess of their minimum trip setting or minimum melting point which can occur at their location. A fuse rated in continuous amperes not to exceed three times the nominal rating of the conductor or a breaker with relay having a minimum trip setting of not more than six times the nominal rating of the conductor will be considered as providing the required protection. The nominal rating of the cables will be as required by Section 2821.
EXCEPTION: Taps need not have separate fault protective devices, provided that the conductors are capable of withstanding the maximum short circuit current that can occur for the time necessary for a fault protective device on the source side of the conductors to operate.
(Title 24, Part 3, Section 3-240-100 and 3-240-101.)
NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
HISTORY
1. Editorial correction filed 11-2-83 (Register 83, No. 45).
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