different voltages between switches in same enclosure

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don_resqcapt19

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Staff member
Location
Illinois
Re: different voltages between switches in same enclosure

Both systems are grounded systems, so there will be voltage between the two hots. The amount of this voltage will vary based on the phase relationship between the two hots and the amount of phase shift between the two systems. Most combinations will result in a voltage exceeding 300 volts between the two hots.
Don
 

harold endean

Member
Location
New Jersey
Re: different voltages between switches in same enclosure

Section 404.8 (b) does not allow 2 switches to be side by side and have more than 300 volts between them What you most often see is a 4" square box with a divider in there to isolate the 277 volt switch from the 120 volt switch. Either that or you can just install 2 different boxes with each switch having only their own voltage in each box.
 
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