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04-02-2008, 08:41 PM
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#1
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Senior Member
Join Date: Jan 2008
Location: Cleveland,Oh.
Posts: 130
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grounding
From time to time at shop where I work Im requested (by mach. Tech)to install a ground rod next to a piece of equipment (metal working mach.,mill) and ground control cabinet to it(this is to disipate static elec.believed to be problem w/cnc equip.),even though mach. is grounded at busway.Wouldnt this be incorrect to add g rod ? sorta like a sub panel with being tie in to a seperate g rod
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04-02-2008, 08:49 PM
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#2
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Senior Member
Join Date: Feb 2007
Location: Eighty Four,Pa.15330
Posts: 5,515
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nope....................... Meaning no ground rod.
Last edited by bobelectric; 04-02-2008 at 08:51 PM.
Reason: Esplainn.
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04-02-2008, 08:53 PM
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#3
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Senior Member
Join Date: Jan 2008
Location: Cleveland,Oh.
Posts: 130
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thanx Ive always been curiuos about this situation. is there anything I could find this under in nec bobelec
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04-02-2008, 09:06 PM
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#4
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Senior Member
Join Date: Feb 2007
Location: Eighty Four,Pa.15330
Posts: 5,515
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Quote:
Originally Posted by stillirnin
thanx Ive always been curiuos about this situation. is there anything I could find this under in nec bobelec
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All this secret seperate grounding isolated dedicated circuit stuff never proved to me that if isolated grounding doesn't go to central point you'all get noise,ect.
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04-02-2008, 09:10 PM
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#5
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Town Drunk
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,716
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See 250.54
Legal, but IMO unnecessary.
I think this is what Brian calls "voodoo grounding" 
__________________
John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution. 
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04-02-2008, 09:13 PM
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#6
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Senior Member
Join Date: Feb 2007
Location: Eighty Four,Pa.15330
Posts: 5,515
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Look ,Man,N.E.C. art.250.One ground point out of many possibie choices.They all must go to it.
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04-02-2008, 09:23 PM
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#7
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Senior Member
Join Date: Feb 2007
Location: Eighty Four,Pa.15330
Posts: 5,515
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and that isolated ground wire we had to pull always went back to the main ground point.
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04-02-2008, 10:34 PM
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#8
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Senior Member
Join Date: Feb 2007
Location: Kentucky
Posts: 665
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Installed a CNC setup at a machine shop about a year ago. The specs for the machine required (2) ground rods at a minimum of 25' from the machine, with both ground rods separated by 6' of course. I definitely didn't want that piece of equipment damaged in anyway by my installation, who knows how much that would cost.
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04-03-2008, 10:41 AM
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#9
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Ax grinder
Join Date: Jan 2007
Location: North Logan, Utah
Posts: 1,898
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Quote:
Originally Posted by bobelectric
Look ,Man,N.E.C. art.250.One ground point out of many possibie choices.They all must go to it.
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You are permitted to install a supplementary grounding electrode (Ground rod) for a piece of equipment and connect this GE to the equipment grounding conductor or the frame of the equipment. See 250.54.
This grounding electrode can't be installed in place of an equipment grounding conductor though.
Chris
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04-03-2008, 07:26 PM
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#10
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Town Drunk
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,716
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Quote:
Originally Posted by chenley
Installed a CNC setup at a machine shop about a year ago. The specs for the machine required (2) ground rods at a minimum of 25' from the machine, with both ground rods separated by 6' of course. I definitely didn't want that piece of equipment damaged in anyway by my installation, who knows how much that would cost.
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When something like this is in the instructions, it is probably best to do it. If, God forbid, something happens, I could very well see the equipment manufacturer not honoring the warranty.
"See, the ground rods weren't installed, it's the electricians fault!" 
CYA.
__________________
John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution.
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