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Discuss Installing a feed to new building - confused!! in the Australia area at ElectriciansForums.net

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Hey yall!


I've been asked to look at a job where there's a new building going up. As part of the build the other contractors are installing all the electrics and other services within the building, but leaving the actual hooking up to external contractors (which is why I've been asked to look at it). Is this normal? It seems very odd to me as basically they're going to stick in whatever they like, then it's up to me to calculate maximum demand afterwards and put a feed in for all of it. I also can't see how on earth they're going to certificate all the work they've done without any power hooked up!

Any suggestions appreciated, is it one to steer clear from or should I just ask them what size they want putting in and put a note that certificating all the work they've done inside will be their responsibility, so they'll have to come back to do Zs and all their certs. Seems like they're just cherry picking the nice jobs tbh as the armour will have to be run under a car park through to the building.

It will only be a 63A single phase as only a small office, so if I go ahead with the quote I guess I'll just size the feed to the main switch rating (63A) and connect the gas and water bonds locally to earth within the CU instead of running back to MET, which is about 150 meters away.
 
No you can not use one conductor for earth and main bonding. They are 2 totally different concepts and need to be seperated.

Bonding in a bathroom is totally different as it's supplementary bonding and that is normally picked up via a CPC. what your doing there is just making sure that all extraneous conductive parts in the bathroom are of equal PD.

To avoid that long run back you will need to make the building a TT supply, then you can say that the earth bar in the CU is your main MET for that installation
 
Thanks

I'd got that from my NIC guy at a job we looked at last assessment! There was a 50mm earth in an installation that he said would also be performing the role of bonding conductor. Thought I'd read it somewhere too but can't find it in the BRB. It looks like a TT will be the best option, unless it would be acceptable to bond it to the clamp where the gas comes out of the ground in the main building, which is obviously bonded back to the MET already.
 

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