bonding
- Thread starter aromero
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mdshunk
Senior Member
- Location
- Right here.
It's often bonded by proxy. The buliding steel is bonded, and the sprinkler pipework is clamped in a zillion places with the hangers to the building steel.aromero said:
electricalperson
Senior Member
- Location
- massachusetts
article 250.104 B says other metal piping including gas lines that is likely to be energized shall be bonded. in my opinion spinkler pipe probably wont be energized. there is also a FPN that says: bonding all piping and metal air ducts within the premises will provide additional safety. you can bond it if you want but its not required
electricalperson
Senior Member
- Location
- massachusetts
250.102 talks about sizing the bonding conductor. follow the table in250.66 for this type of installation if you do choose to bond it.aromero said:
in last couple years I was required to bond the incoming sprinkler near point of entrance (prior to os&y)a few times. Didn't argue, just did it, but now I just ask the inspectors what they want (since I don't have an opinion either way - I mean, lets face it, if there's a fire and a couple of heads go off, the sprinkler pipe is going to be energized, so how can you argue with that ?)
fire sprinkler piping
fire sprinkler piping
individual sections of sprinkler piping are often isolated by the type couplings used in the installation, however, the incoming sprinkler line is often steel (or ductile iron) pipe and buried in the ground for several feet.
To me, it is a far better electrode than most "drinking" water lines in that it is larger and less likely to be disturbed.
I see no reason that it does not fit the description in 250.52(A) and I require it to be treated as a grounding elctrode.
fire sprinkler piping
individual sections of sprinkler piping are often isolated by the type couplings used in the installation, however, the incoming sprinkler line is often steel (or ductile iron) pipe and buried in the ground for several feet.
To me, it is a far better electrode than most "drinking" water lines in that it is larger and less likely to be disturbed.
I see no reason that it does not fit the description in 250.52(A) and I require it to be treated as a grounding elctrode.
Cavie
Senior Member
- Location
- SW Florida
Fire sprinkler pipe is a "Metal water piping system" See 250.104 (A) and 250.104 (A) (1). Most fire departments will not let it be used as a grounding electrictrode but it must be bonded. in accordance with Table 250.66 Don't think domestic drinking water, Think "Metal water piping system" Gas piping falls under 250.104 (B)
electricalperson
Senior Member
- Location
- massachusetts
i always thought metal water piping ment the drinking water pipes. but i guess thats a good way to think of it since it carries water. the code isnt too clear on what they mean by metal water piping. so im sure after a little thinking and code research that it should be bonded and i was wrong in my first few comments. i learned something new once againCavie said:
electricalperson
Senior Member
- Location
- massachusetts
so if all metal water piping should be bonded does that mean we need to bond the cast iron drain pipes that run through a building?
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