Enclosure Installation

Status
Not open for further replies.
C

CMB

Member
Location
Central Florida
Is there any place in the code that says you cannot cut-out the bottom of a floor mounted PLC cabinet, Hoffman type, to accomidate the conduits? All of the conduit stub ups have grounding bushings and a gasket has been installed between the enclosure and the concrete to seal the opening. It is also installed in an air conditioned electric room. Basic 120volt PLC with 24volt inputs and outputs.
This is a common practice for this type of installation when you have 30 or 40 conduits entering the bottom of these enclosures, and it is also on a housekeeping pad.
The local inspector is requesting reference from the code saying this is legal.
 
Its a violation, sorry my 2008 is in the truck but raceways have to be mechanically continuous between enclosures. (In the 99 it 300-10)
 
iwire said:
Its a violation, sorry my 2008 is in the truck but raceways have to be mechanically continuous between enclosures. (In the 99 it 300-10)
Click to expand...

'08 it's 300.12 but theres anexception to "open bottom equipment".
If it's not "store bought" as open thats another can of worms :D
 
Are the conduits used as raceways or can they be called sleeves? Depends on what cable type you have inside the conduit and where the other end of the conduit is. We use a lot of cable tray and cable with a TC rating and you can get away with a lot of things. Depending on what you are doing, look at using Roxtec blocks to bring cables into the cabinet rather than cutting the bottom out.
 
iwire said:
Its a violation, sorry my 2008 is in the truck but raceways have to be mechanically continuous between enclosures. (In the 99 it 300-10)
Click to expand...

Floor mounted MCC and large MCB enclosures are typically open bottom from the factory and all that is required is grounding bushings on the entry conduits.
 
Status
Not open for further replies.
Top