eurekah
Member
- Location
- BC, Canada
Hello, I'm currently designing a control enclosure and have come across an issue that I'm unsure exactly what would be the best way to handle. The control enclosure will be powered from a 480V 3Ph feeder. Typically I used 120V control transformers inside the enclosure, but with this design we decided to supply a 120V ~30A single phase line externally to the enclosure.
I'm planning on having an externally operated handle for the 480V supply as usual, but what should I do for the 120V supply disconnect? Ideally I would like to have a system where the single handle will disconnect both the 480V and 120V supply just to be sure that nothing is left live by accident. I know typical contactors can't be used as a disconnecting means, but does someone make devices like 'certified disconnect relays' so that if the 480V supply gets disconnected it would disengage a relay that would remove power from the 120V circuit?
Thanks for the help!
I'm planning on having an externally operated handle for the 480V supply as usual, but what should I do for the 120V supply disconnect? Ideally I would like to have a system where the single handle will disconnect both the 480V and 120V supply just to be sure that nothing is left live by accident. I know typical contactors can't be used as a disconnecting means, but does someone make devices like 'certified disconnect relays' so that if the 480V supply gets disconnected it would disengage a relay that would remove power from the 120V circuit?
Thanks for the help!