The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 03:17 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 8
Trumpy 6
Who's Online
0 registered (), 202 Guests and 6 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#174679 - 02/11/08 02:00 PM Grounding in Control Panels
rwilsond Offline
New Member

Registered: 08/24/05
Posts: 5
Loc: 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?

Top
2014 / 2011 NEC & Related Books and Study Guides
#174682 - 02/11/08 02:39 PM Re: Grounding in Control Panels [Re: rwilsond]
LarryC Offline
Member

Registered: 07/05/04
Posts: 776
Loc: 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

Top
#174707 - 02/12/08 03:32 AM Re: Grounding in Control Panels [Re: LarryC]
SteveFehr Offline
Member

Registered: 03/19/05
Posts: 1192
Loc: 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.


Edited by SteveFehr (02/12/08 03:33 AM)

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals