Domestic customer called this weekend... and said that the company who he has bought a cooker from, has told him that the cooker should not be installed with rcd protection as it will continuously trip. It seems odd to me and i havent heard of this before, has anyone else?

It can be a big problem with some of these large beasts. i had one in a new build a few years ago, luckily they told me at first fix stage so i wired it in SWA. A pain in the bum on an existing circuit. It will probably need a new circuit, or dig the buried cable out, i wouldn't want to be the one to take it off an existing rcd. Gary

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Specialised Subject. The Bleedin Obvious. John Cleese

I doubt they really mean no RCD at all - it would make it impossible to install on TT systems - which would knock a large hole in the EU market. Maybe the leakage is too much for a 30mA RCD... perhaps.

If the leakage really is that high you'd be well into section 543.7 (high protective conductor currents) territory - so beware of T&E with small c.p.c.s.

- Andy.

No.
It may be the retailer saying this rather than the manufacturer.

Sounds like a strange one! do you think they mean high leakage currents or if not cleaned / maintained they can cause problems.
It would be worth looking at the manufacturers instructions to see what is mentioned, maybe the people in the shop are at the end of a chinese wisper!!

Installing a cooker on an rcd isn't a problem, however old elements can cause problems when cooker old. No a problem a cooker on rcd.

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Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!

Cooker elements often referred to as 'black iron' elements, absorb moisture from the atmosphere.
If they are not used for some time, they will cause RCDs to trip.
Brand spanking new cookers are as prone to this as old cookers.
The greater the length of time between manufacture and first utilisation, the greater the chance they will cause the RCD to trip