Bond water entrance with steel structure?

[greenspark1]

Hi all. The situation is that we have a large office building with the switchgear 300' away from the domestic water entrance. The building is metal framed. Can we use the structural members to bond the metallic water piping instead of running a conductor all the way from switchgear to water entrance? I'm envisioning bonding the water piping to structure and the switchgear to structure? I can't quite tell from NEC 250. Thanks for any insight.

 

[jumper]

If the structural steel is continuous from switchgear to water pipe then yes. 250.68(C)(2).

 

[infinity]

You said metal framed building, you first need to determine if the frame qualifies as a grounding electrode. If so you can do what Jumper said.

 

[packersparky]

You said metal framed building, you first need to determine if the frame qualifies as a grounding electrode. If so you can do what Jumper said.

The 2017 NEC doesn't require the building steal to qualify as a grounding electrode in order to use it as a bonding jumper. That being said, I don't know if Maine is using the 2017 or not.

 

[infinity]

The 2017 NEC doesn't require the building steal to qualify as a grounding electrode in order to use it as a bonding jumper. That being said, I don't know if Maine is using the 2017 or not.

Do you have a code reference for the 2017, we're still on the 2014.

 

[packersparky]

Do you have a code reference for the 2017, we're still on the 2014.

250.68(C)(2)
(C) Grounding Electrode Conductor Connections. Grounding
electrode conductors and bonding jumpers shall be permitted
to be connected at the following locations and used to
extend the connection to an electrode(s):

(2) The metal structural frame of a building shall be permitted
to be used as a conductor to interconnect electrodes
that are part of the grounding electrode system, or as a
grounding electrode conductor. g, the usual steel tie wires, or other
approved means.

 

[greenspark1]

Perfect, thank you for the reference!

250.68(C)(2)
(C) Grounding Electrode Conductor Connections. Grounding
electrode conductors and bonding jumpers shall be permitted
to be connected at the following locations and used to
extend the connection to an electrode(s):

(2) The metal structural frame of a building shall be permitted
to be used as a conductor to interconnect electrodes
that are part of the grounding electrode system, or as a
grounding electrode conductor. g, the usual steel tie wires, or other
approved means.