Advise on hole cutting - steel consumer unit

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Hello,

I'm installing a new consumer unit in my flat for one of my Part P qualifying jobs.

It's a concrete building with all the wiring in conduit and MICC.

I've got a new steel Wilex CU which has various round knock-outs for the cabling, but a few of them don't line up with the existing conduit etc.... some line up half on / half off the knock outs.

Does anyone know of a tried and tested way of hole cutting across knock outs without "knocking them out".

Also can anyone recommend a good set of hole cutters (metric and imperial) for the job.

Any advise would be greatly appreciated,

Thanks,

Al

 

[UNG]

Once the conduit bushes clamp the knockouts in place there won't be a problem

 

[gaffer]

Sometimes wish the manufacturers didnt put those stupid knock outs in and just let us drill the holes where we want them.

 

[UNG]

Especially when the knock out is a different size to what you want

 

[PJK]

Ialso use the 2 x 2 plastic trunking on the top of the CU. It is a very good way of complying with the required IP rating for a horizontal top surface.

 

[Davey101]

Once the conduit bushes clamp the knockouts in place there won't be a problem

Agreed

 

[elektrisien]

You should ideally weld the knockouts shut, grind them down to ensure a smooth surface, then you can drill new holes as and where needed.