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Jumper wire at water meter

8.2K views 11 replies 7 participants last post by  Jim Port  
#1 ·
A ground wire is attached to the street side of the water meter but the inspector insists that a jumper wire is fitted on either end of the water meter. The house side of the meter has 3/4 pex.

Surely if the water meter is removed the house is still ground.

What is the reason for having a jumper wire in this case?
 
#3 ·
A ground wire is attached to the street side of the water meter but the inspector insists that a jumper wire is fitted on either end of the water meter. The house side of the meter has 3/4 pex
Surely if the water meter is removed the house is still ground.

What is the reason for having a jumper wire in this case?
You stated "A ground wire is attached to the street side of the water meter"
From where does this "ground wire" come (or go to)?

One would hope that it comes from the main "Ground Stake" of the premises concerned and this ground to the "meter" is actually an "equipotential bound" to the "Ground" of the premises.

While "The house side of the meter has 3/4 pex "there will be a metallic connection to this "pex".
Your "Inspector" may be being "super cautious" in the event that a plumber may at any time in the future disconnect the meter in that and at the same time a fault in your premises could cause the pex "water" connection to be energized.

While the whole "scenario" is quite a remote possibility, this seems to be a very cheap but super cautionary procedure

In this country, the minimum bonding conductor would be 4 square mm in Cross Sectional Area, which roughly equates to AWG 11, so I would suggest that you should use AWG !0 - or greater.
 
#5 · (Edited)
@Mikeron = "...Surely if the water meter is removed the house is still ground..." = yes

"...What is the reason for having a jumper wire in this case?..." = As joed said, if the water meter is removed for service, the house's upstream copper wiring is not bonded to ground. Additionally, a water meter may the electrical viewpoint as being "dielectric", that is, non-conductive. Of course, we would suspect that it indeed is.....but it may not be build intended for the conduction of household AC currents.

@FrodoOne = "...One would hope that it comes from the main "Ground Stake"... = This is the main service ground. Here in NA, we use the metallic incoming water pipe, not ground rods for system grounds (of course, this is for urban homes, not rural where pressurized city water service is not available).

"...is actually an "equipotential bound"..." = no, its not. It's the main service ground.

"...Is this a home inspector or an electrical inspector?..." = Excellent question. I'd like to know too. You can't ground pex......surely even a home inspector knows that.