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Branch bus bar CIRCUIT BREAKERS 2013-07-04


If the ampacity of a branch bus bar or wire is less than the maximum current rating of any fuse accommodated by a fuseholder it supplies, or if it is less than the current rating of any trip unit (including rating plugs) of an interchangeable trip circuit breaker that it supplies, UL requires a clear and permanent marking, plainly visible when the fuse or trip unit is being replaced. This prevents the use of a fuse, trip unit, or rating plug having more ampacity than a bus bar or wire. A panelboard with branch-circuit bus bars that permit adding a branch-circuit unit, circuit breaker, switch, or fuseholder requires markings on the wiring diagram, the branch-circuit bus bars, or some other location. Markings indicate the ampacity of the bus. This marking isnot required if the ampacity of the bus bar is not less than a) the maximum current rating of any unit to be connected to it; or b) the current rating of the panelboard. If the opacity of a branch bus bar or wire is less than the maximum current rating of any fuse Accommodated by a fuse holder it supplies, or if it is less than the current rating of any trip unit (Including rating plugs) of an interchangeable trip circuit Breaker that it supplies, UL requires a clear And permanent marking, plainly visible when the fuse or trip unit is being replaced. This prevents the use of a fuse, trip unit, or rating plugs having more opacity than a bus bar or wire. A panel board with branch Circuit bus bars that permit adding a branch Circuit unit, circuit breaker, Switch, or fuse holder requires markings on the wiring diagram, the branch Circuit bus bars or some other location. Markings indicate the ampacity of the bus. This marking is not required if the ampacity of the bus bar is not less than a) the maximum current rating of any unit to be connected to it; or b) the current rating of the panelboard.