Am I correct to say that if a house has a cold water ground and I run a grounding electrode to it that I DO NOT need to also install a ground rod? Where I live inspectors like to see both a ground rod and a cold water grounding electrode connection, but after looking at article 250.50 are they going over the code minimum requirement. Thanks.
250.50 Grounding electrode system
- Thread starter mrhanky
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russ
Senior Member
- Location
- Burbank IL
Re: 250.50 Grounding electrode system
250.53(D)(2) Supplemental Electrode Required
250.53(D)(2) Supplemental Electrode Required
pierre
Senior Member
- Location
- Westchester County, New York
Re: 250.50 Grounding electrode system
Don't forget that 250.53(D)(2) also requires one to comply with 250.56, which most likely means two ground rods will be installed
.
Pierre
Don't forget that 250.53(D)(2) also requires one to comply with 250.56, which most likely means two ground rods will be installed
.Pierre
russ
Senior Member
- Location
- Burbank IL
Re: 250.50 Grounding electrode system
pierre:
Just to remind you.
250.54 states that a supplementary grounding electrode, doesn't have to comply with 250.56
I don't understand this, I'm still reading though.
[ November 30, 2003, 09:21 AM: Message edited by: russ ]
pierre:
Just to remind you.
250.54 states that a supplementary grounding electrode, doesn't have to comply with 250.56
I don't understand this, I'm still reading though.
[ November 30, 2003, 09:21 AM: Message edited by: russ ]
russ
Senior Member
- Location
- Burbank IL
Re: 250.50 Grounding electrode system
After looking at my 1999 handbook, I believe you're right. It does have to meet 250.56 requirement.
After looking at my 1999 handbook, I believe you're right. It does have to meet 250.56 requirement.
Re: 250.50 Grounding electrode system
There is a difference between supplemental and supplentary grounds. The supplemental ground rod of 250.53 needs to meet 250.56, while supplementary grounds do not. Supplementary grounds of 250.54 are in addition to any required grounding, while supplemental grounds are those required when metal water pipes are the only GE.
Which means the ground rod at the parking lot light (which is not even required by code) is supplementary and is allowed to be installed without resistance measurements and is not required to have another installed. Only those ground rods installed to meet 250.53(D)(2) and 250.50, need to meet 250.56.
There is a difference between supplemental and supplentary grounds. The supplemental ground rod of 250.53 needs to meet 250.56, while supplementary grounds do not. Supplementary grounds of 250.54 are in addition to any required grounding, while supplemental grounds are those required when metal water pipes are the only GE.
Which means the ground rod at the parking lot light (which is not even required by code) is supplementary and is allowed to be installed without resistance measurements and is not required to have another installed. Only those ground rods installed to meet 250.53(D)(2) and 250.50, need to meet 250.56.
pierre
Senior Member
- Location
- Westchester County, New York
Re: 250.50 Grounding electrode system
250.54 Supplementary Grounding Electrodes.
These, as has been stated are not the same as 'SUPPLEMENTAL' ground rod. I am not sure why the CMP did not try to use a different term for this type of GE, such ancillary, appended, or auxilary. It would sure help eliminate some of the confusion.
Pierre
250.54 Supplementary Grounding Electrodes.
These, as has been stated are not the same as 'SUPPLEMENTAL' ground rod. I am not sure why the CMP did not try to use a different term for this type of GE, such ancillary, appended, or auxilary. It would sure help eliminate some of the confusion.
Pierre
russ
Senior Member
- Location
- Burbank IL
Re: 250.50 Grounding electrode system
Earl:
That clears up my confusion. Thanks for pointing that out.
Earl:
That clears up my confusion. Thanks for pointing that out.
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