switches

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gotmud

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Can I use a standard 20 amp single pole switch for 277 volt switching as long as I identify the wires? I have a building with all 277v lighting and need to install switches. Note...(I do mostly residential wiring so this is not a stupid question for me):grin:
 
As long as the switch is rated for the applied voltage you should be ok. There should be voltage ratings marked right on the yoke or body of the switch. You will also want to check 404.8(B) since you are "adding" switches.

Pete
 
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You need a switch that is rated 120/277 volts.

Looking at the P&S catalog, most of the commercial and spec. grade switches are rated 120/277 V, but some of the residential grade switches are only rated at 120V.

Steve
 
gotmud said:
Can I use a standard 20 amp single pole switch for 277 volt switching as long as I identify the wires? I have a building with all 277v lighting and need to install switches. Note...(I do mostly residential wiring so this is not a stupid question for me):grin:
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If the switch is listed for 277V you can use it. Those little cheap snap switches will say right on the front for 120V AC only and that you can not use. Look on the switch and it will tell what voltage you can use it for.
 
pete m. said:
As long as the switch is rated for the applied voltage you should be ok. There should be voltage ratings marked right on the yoke or body of the switch. You will also want to check 404.8(B) since you are "adding" switches.

Pete
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so is this saying if I have a 3 gang bank of switches there has to be a barrier between all 3 switches?
 
If the voltage measured between switches in that box is greater than 300V, yes. If the switches are all on the same phase and system, then no.

Bear in mind, switches from 120V and 277V could have a voltage difference greater than 300V between them.
 
The 2002 NEC used to require the barriers to be permanently installed, which excluded most means provided by the manufacturers.
In the 2005 NEC, the wording was changed to 'securely installed'. So the barriers manufacturers provide with their boxes are now permitted, such as the ones that slide securely in the slots.
 
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