Lighting circuits are now usually 6A instead of 5A. Ring mains are now usually 32A instead of 30A. However, junction boxes haven't kept up. Is it technically against the regs to use a 30A junction box on a 32A ring main? (and similarly with lighting circuits). Obviously, there is very unlikely to be an actual problem.
Christian.
Obviously I should have said radial circuit.
5A junction boxes are very common. i.e.Christian.
Here are some examples of what is required by BS 7671
Hmm, fair point -- but we're splitting hairs here. No-one in their right mind is going to fault you for using a 30A box on a 32A circuit.
lighting circuits, for ease of wiring.
At most points in most lighting circuits the design current won't exceed 5A anyway and the question won't even arise. In rare cases where the current exceeds 5A there might technically be non-compliance, but it's hair-splitting territory again.
Junction boxes are made to BS 6220, which I've never read. It may be that this defines the ratings of 5 & 30A, so stopping manufacturers marking them
6 & 32A (or maybe not). It may be that the ratings are notional and allow a degree of latitude.I can't help thinking that there are more important things to worry about, but if you want to pursue this then ask the manufacturers and/or read the BS -- and let us know what you discover.
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