You still need to isolate at CU, most likely disconnecting the neutral, unless you have DP rcbo etc. The only time I’d do it load side is during...
Looks like the old armoured underground direct burial BT cable.
If you’ve changed to a cloud voip phone system, your analogue tannoy interface won’t work. You’d need an ATA to connect the old interface, or...
It's good to understand where the values come from, rather than just consulting a table. For an MCB to magnetically trip (as opposed to thermal...
That really is a poor design. Everyone sees a USB socket as fair game these days, even I would assume one on a front panel would be able to...
How many speakers are there? For a cafe, 100v line seems excessive. 100v line is usually used for long speaker runs. A combo of series/parallel...
The cables are not melting because they’re too small, but installed and tightened by someone with poor to little knowledge.
If you have a service agreement with the DNO, the earthing system will be in the agreement and won't change. It is common to have TN-S on some...
It sounds like the generator is running in an "isolated" state. The generators neutral should be tied to earth, if it is designed to do so (most...
It could be TN-S, you would need to check with DNO, or test for resistance N to E. On PME, it is not uncommon for supplies like this to have the...
40amp circuit? 4mm? Umm.
63amp MCB?
[ATTACH] Most people would follow the B standard. Just ignore the colours listed under A.
Have a look at the Eaton Memshield 3 H boards. These provide 2 x outgoing ways for upto125amp MCBs, the rest of the ways being standard MCBs....
Fold and fill the terminal.
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