george t. everett
Senior Member
- Location
- New York
259.104(A)(1) covers the bonding of the interior metal water piping in a separately derived system. How does this differ from the water pipe bonding of a single family dwelling?
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Water Pipe Bond
- Thread starter george t. everett
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george t. everett
Senior Member
- Location
- New York
Re: Water Pipe Bond
Sorry! Should be 250.104(A)(4)
Sorry! Should be 250.104(A)(4)
websparky
Senior Member
- Location
- Cleveland, Ohio
Re: Water Pipe Bond
Hi George,
The water pipe "bond" in this case is distinctly different than 250.52(A)(1) where the water pipe is used as a "grounding electrode".
In this case, the "separatley derived system" (a transformer, for instance), used in an industrial or commercial application will not always be located close to the grounding electrode system for the premises and therefore is required to be "bonded" to the water system in the area in which it serves. Keep in mind, this is a "bond", not a "ground". Also, the exception following helps to understand the intent.
Much different than a house!
Hi George,
The water pipe "bond" in this case is distinctly different than 250.52(A)(1) where the water pipe is used as a "grounding electrode".
In this case, the "separatley derived system" (a transformer, for instance), used in an industrial or commercial application will not always be located close to the grounding electrode system for the premises and therefore is required to be "bonded" to the water system in the area in which it serves. Keep in mind, this is a "bond", not a "ground". Also, the exception following helps to understand the intent.
Much different than a house!
steveve1
Member
- Location
- Tucson, AZ
Re: Water Pipe Bond
Dave hit the nail on the head!
A separatly derived system is considered a new service.
THUS: all bonding requirements for service entrance apply. Acceptable grounding electrodes and conductors can be found in 250-30.
I know that this means that water, et. all, will be bonded at more than one location in a structure. The AHJ's in my area require this "redundant" bonding.
Remember the difference between grounding and bonding.
Dave hit the nail on the head!
A separatly derived system is considered a new service.
THUS: all bonding requirements for service entrance apply. Acceptable grounding electrodes and conductors can be found in 250-30.
I know that this means that water, et. all, will be bonded at more than one location in a structure. The AHJ's in my area require this "redundant" bonding.
Remember the difference between grounding and bonding.
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