Single Phase Disconnect

Status
Not open for further replies.
B

bob1066

Member
I have seen alot of OEM's in my industry (Industrial Water Treatment Equip) provide control panels with no disconnect on the enclosure. The enclosures are usually single phase 120 VAC and contain programmable controllers, relays etc. Is not providing a disconnect on this type of single phase equipment a code violation?

Thanks
 
Re: Single Phase Disconnect

A disconnect may be required, but the manufacturer is not required to be the one who provides it. When I write specifications, I have to state which entity (i.e., manufacturer or installer) is responsible for providing the disconnect.
 
Re: Single Phase Disconnect

Thanks for the feedback. Wouldn't the disconnect be part of the enclosure door to prevent entry into the enclosure?
 
Re: Single Phase Disconnect

The disc. might not be part of the enclosure as long as tagged for what unit and what circuit nothing says has to be part of the same enclosure.
 
Re: Single Phase Disconnect

The door interlocked disconnects on enclosures may be a nice feature in some situations. I have never found many of them to hold up very well if they a defeated often.

Me personally I leave them out of most designs. I will sometimes include a disconnect on the outside of the cabinet.

Paul
 
Re: Single Phase Disconnect

I would suggest reading NFPA 79 Chapters 5 & 6 and doing what you think is best. If the disconnect is not on controller you should not be able to open door without a tool and control panel should be labeled with a warning. :)
 
Re: Single Phase Disconnect

Never designed a machine this way but if memory serves me correctly, a cord and plug will be an adequate disconnecting means. Is this the case in your situation?

Bob
 
Status
Not open for further replies.
Top