Eathing continuiting of building structure

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Eathing continuiting of building structure

Post by Eduexpert on Sat May 13, 2017 3:35 pm

Hi,

An Electrical contractor is installing wiring inside the apartments in a multi-dwelling apartments building block. The job is in Australia, based on AS 3000.

He is not using the boxes in the wall. He is just running the cable from the unit/apartment distribution board to the power outlet and will terminate directly in the outlet.

An independent inspector came to inspect and said that he is concerned if a cable is loose from the outlet behind the wall, and the active conductor in that loose cable comes in touch with the steel studs supporting the gyprock wall, that steel stud will become energised and will cause an electrocution hazard.

The Electrical contractor states that each circuit breaker in the distribution board is equipped with a residual current device/ground fault circuit interrupt.

The inspector is still not happy, he said the Electrical contractor needs to demonstrate that the steel studs are actually earthed.

Each steel stud is fixed to the ground with 2 screws.

Can you please provide some information/standard/link to a website/ which shows how can we test the earthing continuity of the structure? Do we get a normal ohm meter and connect it between each stud and the next? and what should be a good reading? Obviously concrete is not copper so I'm not expecting zero resistance but what is a good value?
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waross (Electrical)25 Mar 17 14:24
It may be safer and more productive in the long run to explain to the contractor that it is not always wise to try to win an argument with the Authority Having Jurisdiction.
Under our code, all connections in a ground path must be made in an approved fashion with approved devices.
I doubt that two screws in a metal stud will be an approved connection method for a ground conductor, by qualified electrical workers.
I would ask for a "Ductor" test on all studs. I doubt that all will pass.
You would not test between studs but between each stud and the grounding electrode.
Be sure to have a good fire watch when performing the Ductor tests.


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