Question about "so-called" cable safe zones

Jun 01, 2026 Last reply: 1 month ago 8 Replies

In a small pantry there are large wall cupboards down the full length of



2 facing side walls. Beneath the cupboards are work surfaces with large cupboards beneath. All the cupboards are "built in" and have been there since the house was built in the 30s. One of the end walls has a window, sink and double drainers (with cupboards beneath, the other has the room door. There is a vertical mains cable in the end wall, within 150mm of the cupboard, and protected by an RCD. The question relates to whether the corner formed by the end wall and the cupboard on the side wall is an internal corner within the meaning of the regs. If so, what about the short run from the bottom of the cupboard to the draining board?

I could put a back box and blanking plate to mark the cable position, but would prefer not to. What's the verdict of those members of the jury who haven't dozed off while reading this?


It is my understanding that the safe zones in corners are places where cables can be expected therefore special care needs to be taken when fixing in those areas it does not mean you cannot fix there.

Sockets can be fixed in any part of a wall although these days tend to be somewhere between waist height and shoulder height. Once placed a socket, switch or other accessory creates its own two safe zones and again the same rules apply.

As a non-electrician I think you should either bury it deeply enought and steel-covered not to matter or put a blank plate (or extra socket?) along it. I think it is accident waiting to happen territory.

These are the official ones:

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I would be wary of installing in other places since it is unlikely that someone drilling / fixing into the wall would necessarily come to the same "interpretation" of a corner, as you did.

If there is no other alternative then you could follow the process used for protecting cables that are not RCD protection that normally should be, i.e:

Surface mounting (bare on in conduit / trunking) Bury >=50mm deep Use a shielded cable with an earthed metal shield Or use a substantial (>3mm) thick steel capping over a buried cable.

The cable has been there for many years. I'm renovating the room and wondering what to do about it.

Yes, but my question was whether this would be regarded as a corner.

The cable has been there for many years; I'm renovating the room and was wondering whether, having discovered it, to mark it with a socket or a blanking plate, or leave it. Because the cupboards are built-in to the room, the corner is similar to the corner of something like a chimney breast where a cable would be permitted, hence the query. If the cupboards were ever removed then the (lime) plaster would be too. I've fitted a blanking plate but don't like the look of it. There's a photo here

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DO you know what circuit it is? If it were a power circuit, then you could add a useable socket in place of the blank - won't look any better, but at least it wont be there for nothing! :-)

Yes, it's a daisy-chained radial on a 20A RCBO. It's 150mm above a wooden draining board, 600mm from the edge of a butler sink and 700mm from the nearest (bib) tap. So it's significantly more than 300mm, but it just doesn't feel right to have a socket in that location. You're right that it would look better ... hmmm.

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