Wiring lighting circuit upstairs & downstairs together?

6 May 2004
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United Kingdom
My consumer unit has only 6 fuseway fitted with 2x 5amp,2x 15amp and 2 x 30amp cartridge fuses I need a spare fuseway for future electrical diy project. I am thinking of wiring all the lighting circuit wires which uses two 5 amp fuseway, one for upstairs and the other downstairs all into one 5amp fuseway? By doing this would leave me with a spare fuse way. Is this safe to do?

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I know it is a fag, but you are better off replacing your unit altogether.

2 circuits should not be lumped together on one fuse like this. At the very least it will be inconvenient: if the fuse blows, the whole house lighting will go down.

In replacing the unit, you can "design in" as much space as you need, and at the same time upgrade to mcb's/rcd's/ rcbo's etc..

Indeed you will need to do this for certain if your "project" is a high powered shower. If your existing unit is a 6-way Wylex, with a 60A main switch, it is not intended to supply a circuit >30A anyway. In which case it will need upgrading to 100A, and while you're at it, are the main fuse, meter and supply tails able to handle 100A?

Talk to your REC (Regional Electricity Co) about the fuse & meter. Tell them what you intend to do and ask them if it will need upgrading.

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