I’m looking for somewhere between 200 and 500m of 4mm2 in the usual 5 colours to wire up the workshop. Where’s the best place to buy it from these days and what sort of price should I be expecting? (I’m going to wire the earth in 4mm2 too)
Not if using it for three phase and neutral with a CPC . 4mm at 500 metres is a 1Km loop ! Must be looking at around a 10mV drop per amp per metre .However, why 5 colours, can you not just use 3
Please explain. Three phase sockets, isolators etc run from the main board as individual radials from there own protective three phase device the same as 16 amp socket, isolators etc that run from there own single phase protective device and single phase sockets that accept fused plugs can run as a radial looped in and out so a string on a given protective device that would be 32 amps if run in 4mm. Here you need to do some thinking as you can run these in 2.5mm cable and use a 20 amp protective device bearing in mind that you will probably have several radials to different areas.When wiring up, I anticipate that any socket could be single or 3 phase 32A
Done correctly there are no issues, but good practice does state no joints within the trunking so you would need to use an enclosure so the cables exit and re enter the trunking with decent connectors.and taking the decision in most cases to put new drops in rather than jointing cables
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