Exception to the rule of grounding.....need answer!!!!
- Thread starter michaeld
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Re: Exception to the rule of grounding.....need answer!!!!
There is not one for any installations I know of.
There is not one for any installations I know of.
- Location
- Massachusetts
Re: Exception to the rule of grounding.....need answer!!!!
Bennies right, you should look at 250.114 exception.
I did not remember about the NEC Exception for double insulated tools.
[ May 11, 2004, 04:55 AM: Message edited by: iwire ]
Bennies right, you should look at 250.114 exception.
I did not remember about the NEC Exception for double insulated tools.
[ May 11, 2004, 04:55 AM: Message edited by: iwire ]
- Location
- Bremerton, Washington
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- Master Electrician
Re: Exception to the rule of grounding.....need answer!!!!
Second, you will void the listing
The manufacturer makes the double indulated tools to a standard and they have a dielectric withstand test done.
First, where will you attach the equipment bond wire?
Second, you will void the listing
The manufacturer makes the double indulated tools to a standard and they have a dielectric withstand test done.
karl riley
Senior Member
Re: Exception to the rule of grounding.....need answer!!!!
I'm curious about this. I've never seen a double insulated tool with a metallic case. Do they exist?
Karl
I'm curious about this. I've never seen a double insulated tool with a metallic case. Do they exist?
Karl
Re: Exception to the rule of grounding.....need answer!!!!
My sawzall hax a 2 wire cord says double insulated on it and the whole front half is a steel case although it is covered by rubber but the rubber I think is just for grip it slides all around.
My sawzall hax a 2 wire cord says double insulated on it and the whole front half is a steel case although it is covered by rubber but the rubber I think is just for grip it slides all around.
Re: Exception to the rule of grounding.....need answer!!!!
When I asked about double insulated motors I was thinking particularly of 680-22(a)(4) (99 NEC)which says a double insulated motor shall not be bonded. It doesn't say need not be bonded, it says shall not be bonded. By the way, what does a double insulated pool motor look like anyways? Do they even have exposed metal parts?
Brian
[ May 12, 2004, 11:36 PM: Message edited by: monkey ]
When I asked about double insulated motors I was thinking particularly of 680-22(a)(4) (99 NEC)which says a double insulated motor shall not be bonded. It doesn't say need not be bonded, it says shall not be bonded. By the way, what does a double insulated pool motor look like anyways? Do they even have exposed metal parts?
Brian
[ May 12, 2004, 11:36 PM: Message edited by: monkey ]
Re: Exception to the rule of grounding.....need answer!!!!
A lot of tools and equipment are double insulated with metal enclosures. The metal is necessary for physical protection.
The first clue is the tools will not have a grounded cord or attachment plug. Garbage disposals and trash compactors have metal enclosures and frames.
I got hammered by two of the professional code instructors, Joe Tedesco and R Keis, for my view on grounding. My view is substantiated in many cases.
50 years ago, I protested the emphasis on grounding and the cost. Equipment grounding, in many cases, is still a big waste of money and resources.
A lot of tools and equipment are double insulated with metal enclosures. The metal is necessary for physical protection.
The first clue is the tools will not have a grounded cord or attachment plug. Garbage disposals and trash compactors have metal enclosures and frames.
I got hammered by two of the professional code instructors, Joe Tedesco and R Keis, for my view on grounding. My view is substantiated in many cases.
50 years ago, I protested the emphasis on grounding and the cost. Equipment grounding, in many cases, is still a big waste of money and resources.
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