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Thanks EFLI , if I can bother you a bit more. Could you give me an example of where you would omit over current protection in a domestic setting please. Then how would you actually go about omitting it. If the resistance of the element decreased, the current would increase? I don't...

Im off work so plenty of time to get myself tied up in knots over (Basic :() electrical theory, so.... I've been thinking about overload, in particular. 433.1.1 and appendix 4 My problem is where overload protection is not required. And the use of design current, instead of the rated...

Or Pimlico and Portugal ;) Thats too cheap, I think he's missed a digit off. and I work in the Boro (Home town) and London Some firms (like Pimlico) charge a lot. But I don't see a vast difference in quote between the two towns. :)

This is related to domestic really So you have the supply into an isolator then on to two consumer units from the diagram.. Ze is at the origin ( Isolator) with the means of earthing disconnected. This supply Cable to the DB's what test on it would you perform on an EICR Now. on an EICR...

0.8 is 80% of 1 0.12 is 12% of 1 The first number after the decimal point, is what counts. 0.199999999999999 would almost be 0.2 I can't believe Im responding to a maths question though, as I'll probably get it wrong :)

If its not too heavy, I really like these. Some care needs to be taken when putting the plug in, and using a long enough screw. but you get a good tight fitting...

Thank you so much for you time and effort John. You have been really helpful. Not just on this post, but on many of my previous posts. The same goes to EFLImpudence. Thank you

Thanks very much JohnW2 Let me read that a few times.

Thanks EFLI Yes I can see that A 20m and a 30m Tree. That would certainly sort out the volt drop. In that situation I would prefer two radials. Its just a theoretical question on length And I always try to avoid 3 cables in a socket as much as possible.

double post !

BS 7671 Fig 15 B Historically, the floor area served has been limited to 50m2 Just re looked its in BS7671. I understand it has to be designed to its individual use, but this is simple standard circuits. You would think they would be some guidance, which I guess is what the OSG tries to do...

So an A3 radial with a 50m maximum floor area. I don't see the sums working out for VD Zs is OK VD2 by studentspark posted 17 Dec 2020 at 2:35 PM

I understand VD is not the only factor. Zs will be the decisive value, i presume. Im sorry, I Don't get how can the total length for volt drop be longer. The first (Radial) socket will take the most load, as any load further loads downstream will take less So to get a longer volt drop, we...

Thanks for all the replies. Don't really understand this. So for a 20 A radial and the load on each socket is in the brackets. and the -----20---- is the load on that section of cable 20A MCB ------20---------[ 1A ]-----19-----[ 3A ]------16------[ 5A ]------11-----[ 0A ]-----11-----[ 1A...

Just trying to calculate maximum lengths of cable for standard circuits (Just CPD) OSG tells us... A1 Ring - 100m2 A3 Radial 50m2 Now I don't find m2 a useful number, as it doesn't tell us the conductor length. Its not necessarily the run of the cable. So I thought I would use volt drop to...

Thanks very much for the reply