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PEX and copper bonding #94249
07/21/05 06:36 PM
07/21/05 06:36 PM
M
Matt Barrett  Offline OP
Member
Joined: Jan 2004
Posts: 28
Danbury, CT
OK I have a question for you guys…

We are currently roughing a house that uses all PEX tubing (plastic water piping.)

But, at every bathroom/sink/fixture, etc, they transition to copper in the walls.
So basically, we have several isolated copper water “systems” in the house supplied by this nonmetallic pipe.

How would you handle the bonding/grounding of this? I want to bond it all together, is that necessary?

2017 / 2014 NEC & Related Books and Study Guides
Re: PEX and copper bonding #94250
07/21/05 06:59 PM
07/21/05 06:59 PM
R
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
Code requires you to bond the metallic piping if it is likely to be energized. I might argue that a stand alone sink is not likely to become energized.


Ron
Re: PEX and copper bonding #94251
07/21/05 09:23 PM
07/21/05 09:23 PM
B
BobH  Offline
Member
Joined: Oct 2004
Posts: 135
Newfane, N.Y USA
You could bond it to the circuit that it is likely to become energized by. If that makes sense. If it is likely to become energized at all.

Re: PEX and copper bonding #94252
07/22/05 09:02 AM
07/22/05 09:02 AM
J
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
This is not a pool area or hospital room. You do not have a metallic piping system, you have seperate pieces of metal.

If you are going to bond isolated sections of pipe simply because they are metal, don't forget to bond the towel and curtain rods. What about the couplings and connectors for the PE tubing?

If you are going to bond the piping because is near a counter top receptacle, then don't forget to bond the drawer pulls also.

Only if there is good probability that the metallic item will come in contact with an electrical conductor is bonding required. I can not think of a situation that would energize these pipe stubs.

Re: PEX and copper bonding #94253
07/22/05 09:41 AM
07/22/05 09:41 AM
R
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
I can think of a situation where the metallic pipe at the sink may be energized, point of use electric water heater, and if it were installed then I would verify that there was an EGC at the equipment to essentially bond the piping at the same time as the heater.


Ron
Re: PEX and copper bonding #94254
07/22/05 11:27 AM
07/22/05 11:27 AM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
I agree 100% with JBD

Quote
You do not have a metallic piping system, you have separate pieces of metal.


No bonding required.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: PEX and copper bonding #94255
07/22/05 04:31 PM
07/22/05 04:31 PM
M
Matt Barrett  Offline OP
Member
Joined: Jan 2004
Posts: 28
Danbury, CT
Thanks for the replies guys. I will leave it as it is.

Re: PEX and copper bonding #94256
07/22/05 06:41 PM
07/22/05 06:41 PM
E
Electricmanscott  Offline
Member
Joined: Jan 2002
Posts: 1,457
Holden, MA USA
Good to ask Matt but for some reason this question kills me everytime I hear it. Alot of people are quick to jump on the bond wagon [Linked Image] without actually thinking for a couple minutes about the situation.

Re: PEX and copper bonding #94257
07/22/05 07:23 PM
07/22/05 07:23 PM
M
Matt Barrett  Offline OP
Member
Joined: Jan 2004
Posts: 28
Danbury, CT
Well, each bathroom has about 20 or so feet of copper in the walls, for shower, sink, etc.

Master is all copper so about 50 feet, but grounded by the steam shower unit.

NM can touch the pipe in some places.

How about the boiler? Allot of copper in the basement but PEX to the AH. So all that is grounded by the 14/2 to the boiler?

It all just seems a little unsafe. All because of plastic pipe.

Re: PEX and copper bonding #94258
07/22/05 07:52 PM
07/22/05 07:52 PM
D
Dnkldorf  Offline
Member
Joined: Dec 2004
Posts: 1,064
nowhere usa
This thread ponders the question:

How is any water pipe likely to become energized?

What is the criteria for likely?


Dnk.....

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