Bathroom spa tub Bond

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vinnyrpb

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If a house has PVC water piping (no copper) do you have to bond the spa-tub motor back to the panel? I was told no!!!! Isn't this only required to be bonded to the copper piping if thereis any in the house??? Can anyone please clarify.

Thanks for the help!

[ July 09, 2004, 01:26 PM: Message edited by: vinnyrpb ]
 
Re: Bathroom spa tub Bond

The question is not completely clear to me. The motor, if not double insulated, will require an EGC run with the circuit conductors.
Don
 
Re: Bathroom spa tub Bond

The idea to bond the copper to the motor ground is elimate any possible electrified pipe
Answer is no thats your 3rd no

[ July 09, 2004, 06:44 PM: Message edited by: jimwalker ]
 
Re: Bathroom spa tub Bond

Originally posted by jimwalker:
The idea to bond the copper to the motor ground is elimate any possible electrified pipe
Answer is no thats your 3rd no
Click to expand...
Jim, the idea is to eliminate the possibility of a voltage gradient.
 
Re: Bathroom spa tub Bond

Jim, another term to go with Ryan's post is equipotential.

In essence it wouldn't really matter if the pipe were "electrified" if everything touchable were at an equal potential, and this is achieved with bonding, not grounding.

Bonding does not achieve "grounding", nor does it take potential difference from earth to copper piping to a value of zero.

Roger
 
Re: Bathroom spa tub Bond

#8 BONDING jumper to metallic lines is to protect pipes from energizing, Not to ground the motor. The motor is protected by the cord EGC, which is connected to the external lug of the motor, which in turn bonds the water piping thru the connected #8.
 
Re: Bathroom spa tub Bond

As written in 680.74, the bonding jumper doesn't need to be solid...it just has to be "not smaller than #8 solid". #8 stranded is "not smaller than #8 solid" and therefore would comply.

Before you jump down my throat, compare the wording of 680.74 to 680.26(C) and you'll see what I mean.
 
Re: Bathroom spa tub Bond

Roger's answer is really well worded and is very specific for this question. Here bonding is not for opening an overcurrent device, but as Roger has stated 'equipotential' reasons.

Ryan
in response to the 'Solid 8 AWG', I remember that the email response from the NFPA was that it could be 8 AWG solid or if of a larger conductor, it could be stranded. The reason put forth that larger could be stranded in this application is that chlorine is not a major factor for hydro massage tubs (Jacuzzis). Also getting a larger conductor than 8 AWG in solid is not easy to locate.

Pierre

[ July 11, 2004, 06:57 AM: Message edited by: pierre ]
 
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