277V Single Pole Breaker in 480Y/277 system

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ajb5102

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Mechanical Engineer
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I can use a 277V rated single pole breaker in a panel rated for a 480Y/277 voltage, because the single pole breaker will be connected to 1 leg of the transformer secondary side and will see less than 277V? Correct?
 
It will see 277V, not "less than"...

If your question is about using "slash" rated breakers as opposed to "straight" 480V rated breakers, if you have a 480/277V system, that is exactly what slash rated breakers are for. So no problem.
 
Jraef said:
It will see 277V, not "less than"...

If your question is about using "slash" rated breakers as opposed to "straight" 480V rated breakers, if you have a 480/277V system, that is exactly what slash rated breakers are for. So no problem.
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I want to know why there are slash rated verses straight rated breakers anyways. Why not make one version to cover both scenarios?
 
ajb5102 said:
and will see less than 277V? Correct?
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At peak hours that 277v may very well drop down to 5-10 volts less, then back up when the off peak usages periods start. The 277v as any other utility supplied voltage fluctuating slightly or at times dramatically during the course of a 24 hour period.
 
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