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(a) Circuit breakers shall clearly indicate whether they are in the open "off" or closed "on" position.
(b) Where circuit breaker handles on switchboards or in panelboards are operated vertically rather than rotationally or horizontally, the up position of the handle shall be the "on" position.
(c) Circuit Breakers Used as Switches.
Where used as switches in 120-volt and 277-volt fluorescent lighting circuits, circuit breakers shall be listed and shall be marked "SWD."
(1) A circuit breaker with a straight voltage rating, such as 240 V or 480 V, shall only be installed in a circuit in which the nominal voltage between any two conductors does not exceed the circuit breaker's voltage rating. A two-pole circuit breaker shall not be used for protecting a 3-phase, corner-grounded delta circuit unless the circuit breaker is marked 1f- 3fto indicate such suitability.
(2) A circuit breaker with a slash rating, such as 120/240 V or 480Y/277 V, shall only be installed in a circuit where the nominal voltage of any conductor to ground does not exceed the lower of the two values of the circuit breaker's voltage rating and the nominal voltage between any two conductors does not exceed the higher value of the circuit breaker's voltage rating.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
1. Renumbering and amendment of former Section 2390.42 to Section 2390.81 filed 8-27-86; effective thirtieth day thereafter (Register 86, No. 37). For prior history, see Registers 83, Nos. 45 and 6.
2. Amendment of section heading, section and Note filed 5-5-2008; operative 5- 5-2008. Submitted to OAL for printing only pursuant to Labor Code142.3(a)(3) (Register 2008, No. 19).
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