mestudentinva
Member
Hello.. I have another question on my audit - not I'm a ME student - so please forgive me if these are rookie questions for you guys - i'm new to the industrial environment too.
ok coming of a sub panel - actually a motor control center - the wires leave the enclosure via a hammond lay in wire tray (square box, painted, comes in sections with gaskets between each section and a hinged lid) - i found it online at:
http://www.hammfg.com/pages/s6_wireway/p320_1485.htm
there is a mix of 480VAC, 24VDC and Network cables in it. I believe the tray is NEMA 12 rated - I'm not sure if that matters or not. Coming out the other side - of the wire tray RMC is attached somehow (I can't see how) and the 480VAC wire leaves the wire tray into the RMC.
My question is.. usually doesn't the RMC have to come all the way back to the MCP and be connected correctly to the enclosure so that you have a ground? With the wire tray between the RMC and panel - it seems like the RMC is not grounded. Is there another way to do this that I'm just missing? Does the RMC need to be grounded?
ok coming of a sub panel - actually a motor control center - the wires leave the enclosure via a hammond lay in wire tray (square box, painted, comes in sections with gaskets between each section and a hinged lid) - i found it online at:
http://www.hammfg.com/pages/s6_wireway/p320_1485.htm
there is a mix of 480VAC, 24VDC and Network cables in it. I believe the tray is NEMA 12 rated - I'm not sure if that matters or not. Coming out the other side - of the wire tray RMC is attached somehow (I can't see how) and the 480VAC wire leaves the wire tray into the RMC.
My question is.. usually doesn't the RMC have to come all the way back to the MCP and be connected correctly to the enclosure so that you have a ground? With the wire tray between the RMC and panel - it seems like the RMC is not grounded. Is there another way to do this that I'm just missing? Does the RMC need to be grounded?
