Residential tub wiring

[celtic]

#4 is what the AHJ calls for so thats what we use for the tub, hot or cold should not matter,

It seems that either you are misunderstanding your AHJ or your AHJ is not following the NEC.

So the bond is a #4....same as for a 200A service :?:
I guess more is better :lol:

 

[George Stolz]

#4 is what the AHJ calls for so thats what we use for the tub...

I agree with Bob. A #8 is all that's required, insisting on a #4 is not consistent with the NEC.

Under the 2005, only the piping in contact with the circulating water (ie the piping under the tub to the jets) is required to be bonded.

Under the 2002, it was more restrictive:

NEC-2002 680.74 Bonding. All metal piping systems, metal parts of electrical equipment, and pump motors associated with the hydromassage tub shall be bonded together using a copper bonding jumper, insulated, covered, or bare, not smaller than 8 AWG solid. Metal parts of listed equipment incorporating an approved system of double insulation and providing a means for grounding internal nonaccessible, non?current-carrying metal parts shall not be bonded.

...hot or cold should not matter...

Given that the bonding was for equipotential purposes, it could be argued that the hot and cold pipes were different piping systems, so the hot and cold would be bonded together again at the tub.

...and run from the panel to the main water line coming in, it is usually plastic nowadays so we have to hit it where it becomes copper.

If by "panel", you are referring to something other than the service, that is incorrect (if this is a single-occupancy building), by the 2002 or 2005.

NEC-2005 250.104(A)(1) General. Metal water piping system(s) installed in or attached to a building or structure shall be bonded to the service equipment enclosure, the grounded conductor at the service, the grounding electrode conductor where of sufficient size, or to the one or more grounding electrodes used. The bonding jumper(s) shall be sized in accordance with Table 250.66 except as permitted in 250.104(A)(2) and (A)(3).

Where the water piping is not a grounding electrode, it is still required to be bonded to the service or one of the grounding electrodes, unles (A)(2) or (A)(3) can be applied.

 

[infinity]

So the bond is a #4....same as for a 200A service
I guess more is better
_________________

Ok, I'm confused. What is the AHJ requiring to be bonded with a #4? Is this the tub and the water pipe?

 

[celtic]

So the bond is a #4....same as for a 200A service
I guess more is better
_________________

Ok, I'm confused. What is the AHJ requiring to be bonded with a #4? Is this the tub and the water pipe?

You aren't the only one:

#4 is what the AHJ calls for so thats what we use for the tub,.....

 

[workingman]

sorry for all the confusion but that how the inspector wants it done so thats how it done. i will let my boss do all the arguing.

 

[celtic]

PROBLEM:

... that's how the inspector wants it done ...

SOLUTION:

i will let my boss do all the arguing.

How you considered asking your boss to pop on this forum?