Separate 480vac feeds wired to one enclosure

[leirbagl16]

Have an application where I am powering 24vdc power supplies from three (3) 480vac feeds (circuit breaker panel). To meet E Stop safety, I need to disconnect these 480vac feeds in order to kill all power to all power supplies. My plan was to wire the three feeds to a single enclosure (12 x 12 x 6) which houses three contactors that I can control, in order to disconnect the 480vac feeds.

My question is, is this arrangement legitimate? Does the enclosure need any type of main disconnect (or three) external to the enclosure to disconnect power coming into it to allow internal access or is a warning label and an indication of where the circuit breaker panel enough.

The distance between the circuit breaker panel and the single enclosure is 10 feet.

 

[MattS87]

Have an application where I am powering 24vdc power supplies from three (3) 480vac feeds (circuit breaker panel). To meet E Stop safety, I need to disconnect these 480vac feeds in order to kill all power to all power supplies. My plan was to wire the three feeds to a single enclosure (12 x 12 x 6) which houses three contactors that I can control, in order to disconnect the 480vac feeds.

My question is, is this arrangement legitimate? Does the enclosure need any type of main disconnect (or three) external to the enclosure to disconnect power coming into it to allow internal access or is a warning label and an indication of where the circuit breaker panel enough.

The distance between the circuit breaker panel and the single enclosure is 10 feet.

I don't see any problem with multiple feeds in the same enclosure. Will definately need labels identifying voltage, power source, shock hazard. with the main panel only 10' away no main breaker is required either.

 

[petersonra]

I don't think that you are required to have any kind of disconnecting means nearby. It's just a branch circuit and not one of the Branch circuits like a motor that requires a local disconnect. You might want to consider putting each contactor in a separate box with it's power supply so you can turn one off and leave the other two on and be able to work on the one that shut off unless that really doesn't matter in your case.