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Fair point.

If there's a space in the CU he could add another ring or radial?

Eh? Bathroom locks are on the inside, aren't they? Can't you just lock 'em both before you have a ****?

if you play LOUD ENOUGH yo won't notice the hum at all ...... 8)

Don't play guitar in the bath (it makes the strings rust.....) :)

... presumably, a fridge is most likely to do this when it switches back on after auto defrost? when power is reapplied, and all the ice is now liquid? or do fridges do something active to defrost themselves these days?

This occasionally happens if either the controls compartment on the guitar is not adequately screened (very common on cheaper instruments, rather too common on dearer ones) and/or if the required earth connection in the guitar from the cable screen (i.e. the amplifier earth) to the bridge (and...

... unless the fault is at the supply side of the FCU, e.g. someone sticking a nail through the cable? But then, I suppose, you'd get a short (and blow the fuse/MCB) rather than a sustained too-high current of, say, 40A ..... Interesting, thanks guys

otherwise it, I suppose, becomes an unfused spur (as far as the fuse, anyway)?

Good point, there was an interesting thread recently about the current rating of double sockets .... hmm. Still think it's a little odd, then, that they allow what they do with an underrated cable (or at least, rated < the protection device) Thanks plugwash, I can see why you have that...

But doesn't this mean that (if the spur cable must have the same rating as the ring cable) then even spurring as permitted allows the spur cable to be overloaded before the cct protection breaks? Also, if the (permitted) spur goes to a double socket (which I think is allowed) how is this...

Sorry, having a bit of a dense day today :oops: One may take a spur off a ring main, not a spur off a spur, or off an already-spurred socket. I understand the rule, but can't work out why it's so? Is it to do with the ring protection being 32A rather than 16A as for a radial? I have a...

This is one of 2 similar CUs ... I don't know the rating of the service fuse ...

Excellent help, thanks again Ban. Returning to the question I posted to ask, re 80A CU and diversity calc - could someone pls show me how that is calc'd and whether I'm in the clear? MTIA

I can understand that, but the trench is only about four feet long and in easy soil so not a big issue. Of course I'm not questioning your concern - re the current capacity of the SWA armour - but it's CSA appears way larger than the earth conductor of the 6mm T&E used in the same cct, which is...

I already had this piece - it's easy to change if necessary, the trench is (deliberately) not filled in yet. Would would the 'right' SWA have been?

Aren't they all 30mA?

... provided it trips before the one in the CU?

Thanks to all who helped along the way (here and elsewhere), my shed electrics had the big switch-on last night and all seems OK. One final question, if I may; the cable to the shed goes to a 'garage CU' with one 16A and one 6A MCB. The cable from kitchen CU to shed is 6mm T+E (inside) and...

As my old lecturer would have said, "The fuse didn't fail! The fuse worked...." :)