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Posted By Topic: Stainless benchtop bonding

Tom93
Feb 09 2020 17:25

Hi so we recently pre-wired a new build house and in the color spec said nothing specific about the benchtop but the color drawings given showed a maltica benchtop, so no bonding wire run. However when we come to do fit off we have the suprise of finding a stainless benchtop. Now there are no hot points coming through the stainless, but there is a electric hob in the middle of it. Would we need to bond it. Not having much luck finding anything in 3000 about it.
   

AlecK
Feb 09 2020 18:36

The reason you can't find a requirement to bod benchtops is because there isn't one.

Equioptential bonding is for things that are in electrical contact with the ground; not for things that are completely isolated from it.
   

DougP
Feb 09 2020 22:31

Of course that doesn't stop the builder or plumber, or the kitchen guy, or about half of the electricians in NZ from telling you that it is required to be earthed/bonded.

Of course Alec is correct. You can't find anything about bonding benchtops in section 5.6, because there isn't any requirement.

It sounds like you are already aware that it _might_ be required to be earthed if there are socket outlets or switches mounted on a conductive splashback (for example), if the conditions of 5.4.6.1 can't be met.

   

AlecK
Feb 10 2020 16:32

"Of course that doesn't stop the builder or plumber, or the kitchen guy, or about half of the electricians in NZ from telling you that it is required to be earthed/bonded."

or a large number of "Inspectors".
   

Tom93
Feb 10 2020 17:23

Yeah correct about the hot points, but in regards to the hob, that wouldn't change the fact ae, as it has it's own earth?
   

AlecK
Feb 10 2020 19:55

Exactly.
The hob has it's accessible conductive parts earthed.
How is the bench ever going to be at a different voltage to the hob? It's not as if it can generate its own voltage.
   

Tom93
Feb 11 2020 12:43

That's cool, it's just more that my boss was after a definitive answer on it as hes always bonded the benchtops. And this was my arguement as to not needing to be worried about it.
   

AlecK
Feb 11 2020 14:32

would suggest your boss is out of date.
There used to be a requirement to bond metal benches, but that was in back in the days of ECP 25; which ceased being relevant 20 years ago.