Bonding Separately Derived Systems

[RAGG]

Reference NFPA 70, 2008 handbook, Exhibit 250.15, page 214. For wood construction, if there was a restroom on the upper floor (in the area served by the separately derived system) there would be a requirement to bond the water pipe to the grounding electrode conductor, per 250.104(D)(1).

If the building were of steel construction, then the separately derived system could be connected to the building steel in the immediate area with restroom water pipe bonded to the building steel in the restroom area.
Correct?

 

[RUWired]

Reference NFPA 70, 2008 handbook, Exhibit 250.15, page 214. For wood construction, if there was a restroom on the upper floor (in the area served by the separately derived system) there would be a requirement to bond the water pipe to the grounding electrode conductor, per 250.104(D)(1).

Yes, that is correct. That also coincides with article 250.30(A)7

If the building were of steel construction, then the separately derived system could be connected to the building steel in the immediate area with restroom water pipe bonded to the building steel in the restroom area.
Correct?

You would only need to bond the steel in the area of the SDS if the water was not in the area.If both the water and steel is in the area, both are required to be bonded. Only one conductor needs to be run as long as a jumper is installed between the two.
Rick

 

[RAGG]

Thanks for the reply. Seems everybody reads 250 a little differently.