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The SWA is buried.. other services are inside the conduit. So yes, I understand the difference. And yes I understand the risks. Which is why I’m here, asking for your help, rather than continuing to have this system wired up, so we can avoid anything bad from happening to anybody. I’m not sure...

Now that is helpful advice, thank you. I know how to do groundworks, how to trench and lay cable, how to wire a circuit and make off SWA. What I don’t know, as I said, is how to design and spec a system in its entirety. This, I did not do; I asked the village to recommend an electrician and...

Good question poni; this was the Sparky’s say. He turned up with it on the morning he came and said “fit this where the SWA enters the wall into the outbuilding.. I think I need one because the electrician said so, simple as that. As time has gone on and I’ve seen his work and sought third...

Good advice!

Excellent, thank you. I’ll get that information tomorrow. Very worrying now to think the sparky spec’d 4mm originally… This is why I’m so concerned about the rest of his suggestions and work. Your input is invaluable, much appreciated!

No, and you shouldn’t, which is why I hired an electrician and consulted many forums and calculators to arrive at the specifications I, and the electrician, did. I trenched in the cable, mounted and wired the sockets and lighting, made off the SWA, installed the consumer unit and purchased...

I specialise in timber framing, mostly shipwright work, but a cabinet maker historically and plenty restoration, which covers general building. What’s yours!? I would really love some more detailed information if you have some to offer, rather than such vague short answers? I truly wish to...

I did indeed. I used a couple of other calculators too, and it seemed like 6mm 3 core was within the bounds of what I need. I refer to: Except where installed in a conduit or duct which provides equivalent protection against mechanical damage, a cable buried in the ground shall incorporate an...

Because everything I read and researched led me to believe that it is what I required for an electrical supply to a workshop outbuilding 55m away running machines. SPD requires earth right? I’ve fitted an earth rod and spec’d in the SPD too, so that requires the 3rd core. Please tell me...

That’s 2 core, I’m using 3 core. I’m showing these results with the same data but 3 core: Required Cable Size 6mm Voltage Drop 6.83 Volts Percentage Drop 3.0% Current Load 18.3 Amps Max Cable Load 46.2 Amps

Interesting, as that’s exactly the type of calculator I used to calculate what I would need, one on TLC direct. It’s actually about 55m

How do you know the size of the sub-main? And how are you calculating that value? I’m also concerned that I haven’t seen the electrician run a single test so far, and didn’t even check my socket wiring for cross polarity had the plates off ready for inspection and everything! He spec’d 4mm SWA...

I have a meter, nothing fancy but I guess can carry out these tests. Could you briefly outline where I connect to get the values?

Okey doke, I’ll do my best. Everything in the garage is surface mounted by the way. - SWA is 6mm 3 core spanning 55m - Metalclad boxes with standard 2.5mm - Metalclad switch with standard 1.5mm I’ve never tested Zs at MET or impedance myself on a system so I can’t tell you those right now, sorry

Hi folks, Just finishing up a garage conversion into a wood workshop for myself. I’ve trenched in a new 6mm SWA (60 metres in hard clay and rock!), and I’ve wired up all my sockets and lighting circuits on the workshop end, earth rod is in, gland made off garage side, consumer unit all ready...