Circuit board mystery....

[prendle]

Hi

This is my first time posting on DIYnot so please go easy on me! I have found many answers to my questions in these forums, but can't find anything to answer my current question. I apologise if any of my terminology is wrong, but electrics aren't my strong point.

I am fitting a new kitchen, including a new electric oven to replace the old gas one. As we have a spare MCB slot on the circuit board I am hoping to run the cooker on a separate isolator. My dad (who has done a reasonable amount of electrics before) has run a 6mm cooker cable from the fuse board to the cooker tower cupboard and into a new cooker socket (containing a switch for the cooker and one normal socket). When we tested it nothing happened on when we tripped up the MCB, but as soon we drew any power off the circuit (when I turned on an electric drill which was already plugged into the socket) the whole board tripped.

We can't understand why it all tripped, if it was wired up wrong surely it would trip out immediately and it’s not draining any significant power - the MCB is rated to 32A.

If anyone can help identify the problem (and even better explain how it can be fixed) I would be very grateful.

Thanks

 

[DetlefSchmitz]

Post a picture of the inside of your 'fuse box'.

 

[Stoday]

Presumably when the "whole board tripped", it was the RCB that tripped.

If so, you have connected the 6mm neutral to the wrong busbar.

 

[pjcomp]

Depends on the configuration of the consumer unit (RCD main, split load, etc, dual-RCD, etc) but if it trips teh whole board that sounds like you've got an RCD main switch. Incorrect wiring by itslsef will not necessarily trip the RCD without power - check inside the cooker point, are the live, neutral and earth in the right places?

PJ

 

[AndyPRK]

Probably connected the new neutral to the wrong terminal block.

 

[prendle]

It was indeed simply a case of the neutral being wired to the wrong busbar - thank you all for your assistance with my somewhat schoolboy error!

Cheers