2002 NEC 250.104(A)(4)

Status
Not open for further replies.
G

gregt1

Member
2002 NEC 250.104(A)(4) I believe I understand the requirements of this article...but my understanding does not go along with the electrical inspector or engineer on this project.

My understanding: Separately derived system. The interior metal water piping in the area served by the SDS must be bonded to the grounded conductor of the SDS. Can be done 2 ways. #1 By running a bonding conductor from the metal water piping to the connection point of the grounding electrode conductor on the SDS. #2 By running a bonding conductor from the effectively grounded frame of the building, if the frame is used as the grounding electrode for the SDS, to the metal water piping that is in the area served by the SDS. These bonding conductors would be sized off of 250.66.

Their understanding: There is no need to bond the interior metal water piping in the area served by the SDS because the building water line is bonded to the building steel back at the main service.
Please clarify!
Thanks
 
Re: 2002 NEC 250.104(A)(4)

The exception to 250.104(A)(4) clearly states "in the area served by the SDS."

I don't think the bond at the main service would qualify if it is not "in the area" of the SDS.
 
Re: 2002 NEC 250.104(A)(4)

Originally posted by gregt1: Their understanding: There is no need to bond the interior metal water piping in the area served by the SDS because the building water line is bonded to the building steel back at the main service.
Click to expand...
Help me understand ?their understanding.? Where and how are ?they? planning on making a connection from the grounded conductor of the SDS to planet Earth? Are they suggesting that it is OK to bond the grounded conductor to the nearby building steel, and then take credit for an existing connection (pipe to building steel) located some distance away?

If that is ?their understanding,? then I agree with Bryan. It would not meet the code requirement.
 
Re: 2002 NEC 250.104(A)(4)

Originally posted by charlie b:
Originally posted by gregt1: Their understanding: There is no need to bond the interior metal water piping in the area served by the SDS because the building water line is bonded to the building steel back at the main service.
Click to expand...
Help me understand ?their understanding.? Where and how are ?they? planning on making a connection from the grounded conductor of the SDS to planet Earth? Are they suggesting that it is OK to bond the grounded conductor to the nearby building steel, and then take credit for an existing connection (pipe to building steel) located some distance away?

If that is ?their understanding,? then I agree with Bryan. It would not meet the code requirement.
Click to expand...
 
Re: 2002 NEC 250.104(A)(4)

Charlie,
This is on a school that is being built for the school district that I am a maintenance electrician for. "Their understanding" is the AHJ, the electrical engineer and the contractor. They are connecting the grounding electrode conductor for the SDS to building steel in the immediate vicinity of the SDS. Then they are trying to take credit for the bond to the water pipe back at the building service to satisfy 250/104(A)(4). This is some distance away from the SDS
Thanks for the help
 
Status
Not open for further replies.
Top