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Posted By Topic: 110v Sockets

Nov 08 2018 16:16

WE have a client that has a couple of pieces of 110V equipment that he would like to use in his house.
Can we install a 230-110v stepdown transformer in his garage and use that to supply a couple of 110v Sockets in his house.
I believe we are not allowed but have been unable to find the relevant references in the regulations and AS/NZS3000



Nov 08 2018 16:45

you would a require a 110V socket that has attained a NZ SDoC, I believe Legrand have one in their Arteor range that has this. As it is a different outlet style it should be legal, but it would pay to label them some how 110V 60Hz etc.

Nov 08 2018 16:53

I don’t believe that there will be a prohibition on doing this but there are several things that you have to get around.
The first thing is that domestic installations have to be done to comply with AS/NZS3000:2007 Part 2.

This means that the socket outlets will have to be RCD protected. Hard to achieve after an isolating transformer.

Most 110 volt equipment comes from the USA and is designed to operate at 60hz. Motors will run slower and draw more current. Cooling fans will possibly not move as much air as required.

Appliances that do not comply with one of the standards cited in Schedule 4 of the Electical (Safety) Regulations 2010 are by definition unsafe. ESR23. It is unlikely that 110V appliances will comply with any of the cited standards.

So despite there being no rule specifically saying No the things you have to get sorted are many.

Nov 08 2018 17:44

The other thing most small transformers can\'t do is supply sufficient fault current to operate fault protection by automatic disconnection. Could use an RCD on the output, but won\'t find one that\'s been Approved as a DHRA and operates on 110 V.

There are new additional rules specifically for non-standard socket types in the 2018 edition of \"3000\" []. Basically only allowed in international airports & hotels; and if at 110 V have to be supplied at \"reduced low voltage\". True the new edition has yet to be cited, but you\'d be brave / foolish to ignore what it\'s telling you.


Nov 09 2018 15:16

> There are new additional rules specifically for non-standard
> socket types in the 2018 edition

That\'s just mean.

Of course, the right answer is to use sockets according to IEC 60309 a/k/a ceeform.

Conversion from ceeform to USA is left as an exercise for the homeowner.


Nov 15 2018 11:48

maybe mean, maybe not.
Whichever, the NZ-only bits of this new clause are direct from Energy Safety so better get used to them.