Ovens - Which busbar?

[megawatt]

Hi all,
I've read conflicting advice regarding this on numerous posts on this forum so I'd appreciate your views ...
Assuming two RCD protected busbars one covered by a 100mA Time Delayed RCD and the other a standard 30mA RCD, which busbar should oven MCB's hang off? i.e. Do ovens cause nuisance trips with 30mA RCD's and, if so, does the TD 100mA RCD provide adequate protection?
Nice to get a definitive answer to this.
Thanks in advance

 

[securespark]

Hopefully it won't hang off at all, you should tighten up the bottom screw.....

Ovens can be prone to nuisance tripping - if your oven does not have a socket incorporated in the control, then put it on the TD side, if it does, and that outlet could reasonably be used to feed equipmnt for use outdoor, then put it on the 30mA side.

 

[megawatt]

No sockets just two Bosch ovens in a tower cupboard each connected to their own 20A MCB at the new CU.
I'll screw them (tightly) to the 100mA TD busbar
As these can easily be isolated at the MCB is there still a requirement for each to have an isolator switch close nearby? ... Protection is nice but these are pretty ugly switches and, unlikely, to get used I think.
Thanks

 

[Adam_151]

Isolators should be fitted near to the ovens and be easily identified as being for them, so they can be quickly and easily switched in the case of a fire, should be to the side of the cooker though, so you don't have to lean across flames to switch them

also you get double pole isolation for maintainance

 

[megawatt]

I thought as much but thanks for the confirmation ... Guess I could hang an oven glove over them

 

[ban-all-sheds]

Protection is nice but these are pretty ugly switches and, unlikely, to get used I think.

"Ugly" is of course in the eye of the beholder, but given that kitchens are primarily places of work, and will have pots, pans, kettles, toasters, food processors, utensil jars, knife blocks/racks etc scattered about the place, I always feel that people sometimes overestimate the visual horror of cooker control units.

Firstly, they aren't all lumping great things:

Secondly, if you're using metal accessories, there are some quite neat ones around:

And lastly, of course, in your case you only need 20A switches:

 

[megawatt]

Thanks ban I didn't even think that I would only need 2 20A switches now and I agree that they are far more pleasing to the eye.
That's what makes this forum so useful

 

[ryanj]

This one I've recently installed myself. Don't think it looks too bad.

 

[securespark]

Tchhhh....you could have got the fixing centres on the grout lines........what a messy job!!

 

[ban-all-sheds]

This one I've recently installed myself. Don't think it looks too bad.

I'm afraid you've been asleep for quite some time Ryan.

It is now September 2005, and it is 9 months since you installed that.

Nurse Lynda here will take you for your medication now.

 

[ryanj]

Crikey.

Scotland though. No worries about that up here.

Why were you on a sex toys website?

 

[megawatt]

I think I'm in need of some medication also ban ... Do you have an address?

 

[ban-all-sheds]

Nurse Lynda has gone off duty now, but Nurse Doris here will sort you out...

 

[kai]

Your control panel has a socket - then it must be on the 30MA rcd side.
(unless you are in a first floor flat or above!).

 

[plugwash]

that is correct according to the niceic interpretation of the IEE wiring regulations others disagree.