Multiple Voltage in One Box

SpencerSpe

New User
Location
Arizona
Occupation
Project manager
We are involved in a remodel of a retirement home. The architect has decided to put all the switches in one location in a four gang configuration. We have found that some of the lights are 277 volts others are 120 volt. The voltages are in separate conduits. Does this break code?
 

mikeames

Senior Member
Location
Germantown MD
Occupation
Teacher - Master Electrician - 2017 NEC
Many threads on it. Someone did the math on all the possible combinations, but I cant find it.

 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
I believe there are at least 7 possible voltages between the conductors of a 208Y/120 volt system and those of a 480Y/277 volt system, with 3 of those voltages being less than 300 volts.
Most AHJs will require the barriers even where there are conductors from both systems in the box.
 
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