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Pyro really? it has an outer protective layer like SWA. Interesting. Thanks

This is a block of flats, the service cable entering the flat is SWA, I presume this is OK as it is how the flats were supplied from build. , and have seen SWA used in lots of places to feed from the isolator so don't understand your comments RF Here is a picture The green cable...

:? indeed

Sizing Earthing conductor This is the cable from the supply cable (SWA) to the MET ( an earth block) Clamp is a Bs 951 earth clamp - not acceptable on lead, is that still the case on SWA? Cable looks to be 4mm2 but could be 6mm2 Now I understand that this is nothing to do with...

Well sometimes you change the bulb and it does not work, then you change the transformer and it still does not work, so you change the lamp holder..... I just changed a transformer still not working, (Aurora) changed again and it worked. Would a blown transformer test a certain way?

What tests a ELV transformer can you do to check it works. This is when it is not connected to a supply, out the box as it were.

what could be the possible reasons why a transformer blows. changed a ELV down light transformer (one per fitting) when switched it on it worked for 2 seconds then the transformer popped. wired correctly mains to primary, lamp to secondary. out of 5 lights only one works all the...

I do need to grasp these circuit drawings. I find them hard to follow. In the example above first one it looks like live goes to A which will then switch between B and C. C being off and B goes to load. It was the neutral going to the load. It looks to my mind that you are switching from...

Hi Trying to understand heating systems, but am at the real basics stage (at college but the course does not do heating I believe) Combi boilers heat water on demand so when the hot tap is turned on the boiler fires up straight way, no need for controls? Do some combi boilers have...