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#174679 - 02/11/08 06:00 PM Grounding in Control Panels  
rwilsond  Offline
New Member
Joined: Aug 2005
Posts: 5
Rancho Santa Margarita, CA
Section 409.60 of the 2005 NEC refers to "Multisection industrial control panels", but there is no definition. What would be an example of a Multisection industrial control panel? Would it be multiple sub-panels in a common enclosure?

Also, the second sentence of 409.60 seems ambiguous. Is a grounding bus required for a Multisection industrial control panel?


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#174682 - 02/11/08 06:39 PM Re: Grounding in Control Panels [Re: rwilsond]  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 781
Winchester, NH, US
In a previous life, I used to be control panel assembler. On big assembly lines, we could have 6 Hoffman 4' wide by 6' tall enclosures bolted together to make 1 long-ass control cabinet. I think that would qualify as a "Multisection Industrial Control Panel."

Also look at multi-cabinet control consoles for control rooms at large industrial facilities, nuclear plants, etc.

Larry C


#174707 - 02/12/08 07:32 AM Re: Grounding in Control Panels [Re: LarryC]  
SteveFehr  Offline
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Joined: Mar 2005
Posts: 1,198
Chesapeake, VA
I believe they're referring to large switchboard-style cabinets.

409.2 defines "Industrial control panel" and refers to pretty much anything, including breaker panels, switchgear, MCC, pushbuttons, etc. 409.60 just wants to make sure you properly bond them all together if they're installed as a single multisection unit. If you mount individual industrial control panels 1" apart, I do not believe 409.60 applies.

Edit: 409.2 was re-written in 2008, but doesn't appear to really change the definition, just presents it differently.

Last edited by SteveFehr; 02/12/08 07:33 AM.


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