Took delivery of a new dual fuel cooker today. (It's a Cannon Henley dual
fuel cooker not that suppose that makes any difference).

Prior to installation, I had reinstated the old electrical connection (which
had lain disconnected and unused for years when we had a gas only cooker)
and wired it to a new 32amp MCB in the consumer unit. Our unit is split
into non-RCD protected circuits on one side (lights, CH and alarm) and RCD
protected circuits on the other (sockets etc.)

I fitted the new MCB to the non-protected side and everything seemed to work
(at least with a meter)

Fitted the cooker and switched on at the wall and the clock duly lit up and
the igniter worked fine for the gas hobs. Turned on the *gas* grill and the
power died. The RCD had tripped. Same happens if I turn on the oven.

What's going on? Even if I've fitted the mcb to the wrong side, how can the
RCD trip when the mcb is on the non-protected side?

Any suggestions before I tear the remains of my hair out?

Tim

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Check that if the mcb is on the non Rcd side that the neutral is also
connected to the non rcd neutral rail. did this on my own consumer unit a
while ago, and the embarrassing thing is I'm an electrician shucks.

loz
"Tim Downie" wrote in message
...
Took delivery of a new dual fuel cooker today. (It's a Cannon Henley dual
fuel cooker not that suppose that makes any difference).

Prior to installation, I had reinstated the old electrical connection
(which
had lain disconnected and unused for years when we had a gas only cooker)
and wired it to a new 32amp MCB in the consumer unit. Our unit is split
into non-RCD protected circuits on one side (lights, CH and alarm) and RCD
protected circuits on the other (sockets etc.)

I fitted the new MCB to the non-protected side and everything seemed to
work
(at least with a meter)

Fitted the cooker and switched on at the wall and the clock duly lit up
and
the igniter worked fine for the gas hobs. Turned on the *gas* grill and
the
power died. The RCD had tripped. Same happens if I turn on the oven.

What's going on? Even if I've fitted the mcb to the wrong side, how can
the
RCD trip when the mcb is on the non-protected side?

Any suggestions before I tear the remains of my hair out?

Tim

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Remove the obvious to reply by email.

On Tue, 18 Nov 2003 19:06:03 +0000, LOZ34 wrote:

Check that if the mcb is on the non Rcd side that the neutral is also
connected to the non rcd neutral rail. did this on my own consumer unit a
while ago, and the embarrassing thing is I'm an electrician shucks.

Agreed. Did this awhile ago on customers lighting circuit. Spent 20 mins
looking like a prat.

Dave

Dave Stanton wrote:
On Tue, 18 Nov 2003 19:06:03 +0000, LOZ34 wrote:

Check that if the mcb is on the non Rcd side that the neutral is also
connected to the non rcd neutral rail. did this on my own consumer
unit a while ago, and the embarrassing thing is I'm an electrician
shucks.

Agreed. Did this awhile ago on customers lighting circuit. Spent 20
mins looking like a prat.


Bingo! I'm a prat! ;-)

Many thanks to you both.

Tim

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