100m of 1.5mm² cable is about 2.5Ω and volt drop @ 13A about 32v or 198v assuming a perfect 230v at the source [191v for 1.25mm²]The limit is i think about 100m last time we calculated, and that was using a socket at the limit of the circuit and a 13A fuse.
If you are running low power items, and are concerned, just change the plug fuse to 3A.
The volt drop would be small for the typical loads from small power supplies
I take it this is domestic, in which case It is likely to be trouble free. I wouldn't have it meandering all over the house plugging in one lead after another though.Is there a limit to how far a electrical extension cable can go? I want to add a few low power amplifers inside a suspended ceiling and only run one cable from the power source and then just daisy chain from there.
true although I was assuming the very small loads mentioned by the OP. The 13A was the fuse I assumed in for the fault protection hence the suggestion to change to 3A.100m of 1.5mm² cable is about 2.5Ω and volt drop @ 13A about 32v or 198v assuming a perfect 230v at the source [191v for 1.25mm²]
true although I was assuming the very small loads mentioned by the OP. The 13A was the fuse I assumed in for the fault protection hence the suggestion to change to 3A.
I had a similar problem fitting lighting in a new 300m road tunnel. We had a 100KVA genset about 50m from the tunnel, 16mm² 3ph SWA feed into each tunnel then 10KVA 110v transformers every 30m or so with 3kw of flood lamps. The volt drop caused by the lights was such that our 40W flou fittings would struggle to strike and the Dewalt 14" 1.7KWn chop saw would reach speed but stalled easily while cutting SS Unistrutt by the time we got halfway along the tunnel. The conduit threadcutter was even worse. We had to avoid turning lights on in order to use them.A slight off topic, when I was working in Zimbabwe, one of the sites I was looking after asked me why all the power tolos were running slow, the main supply was via a flex strung along poles, I walked the route and after 2 kilometres found the source
12m for PAT CoP.100m of 1.5mm² cable is about 2.5Ω and volt drop @ 13A about 32v or 198v assuming a perfect 230v at the source [191v for 1.25mm²]
IIRC the limit for 1.25mm² is about 30m for PAT.
Yes I saw that in post #7 which is a little worrying when I see things like these in regular commercial use, complete with PAT sticker:12m for PAT CoP.
It does.Its been a while since I did any PAT, but you could get round the max length rule by fitting an RCD, not sure if it still applies
I've never understood this one...Its been a while since I did any PAT, but you could get round the max length rule by fitting an RCD, not sure if it still applies
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local