Discuss Why does the UK use rings for sockets? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
because to crate a 32A radial, you need to use 4mm or 6mm cable. and a radialcould well end up with the last socket alomost back to the board, so the extra leg of a ring might be only a few yards.How does a ring use less copper?
A radial is basically a ring without the return cables. Confused!
As already mentioned by @telectrix because the ring can use smaller cable for the same overall rating. Almost all final ring circuits in the UK use 2.5mm cross sectional area cables for a 32A rating, to do the same total current as a radial you need to use 4mm (saving in copper of typically over 30%) or even 6mm if the length is great.How does a ring use less copper?
A radial is basically a ring without the return cables. Confused!
Schneider produce rcbos with no neutral fly lead on their acti 9 isobar P DB’s, think the rcbo’s are only single pole tho.Do you think that manufactures will standardise with the rest of the world and produce dual module RCBO's and get rid of the flying lead?
no neutral or no earth?Schneider produce rcbos with no neutral fly lead on their acti 9 isobar P DB’s, think the rcbo’s are only single pole tho.
No fly leads on eitherno neutral or no earth?
Because its ours. Long live the RFCBecause we are British and don’t like change and have to do everything differently to the rest of the world
not seen these as yet.No fly leads on either
Isobar P is the first LV distribution board to have a plug-on RCBO (residual-current circuit breaker with overcurrent protection) capability. RCBO neutral and functional earth connections are usually wired into the neutral and earth terminals inside the distribution board, costing significant time by introducing additional wiring. With the new Acti9 Isobar P, installers can simply plug their RCBO directly into the board. This eliminates the need to cut, straighten or dress any excess wiring therefore reducing installation time by half.
See link abovenot seen these as yet.
2 modules is Far too big for some of the domestic CU’s and won’t fit in 3phase DB’sContactum make dual pole RCBO's to international standard which in France, Switzerland and Germany it is a requirement to disconnect the neutral on activation: 40 Amp 30mA RCBO - 2 Module - Contactum - https://www.tlc-direct.co.uk/Products/CPBR402.html
I went with Wylex for that reason, but in my case it is more about ease of testing.2 modules is Far too big for some of the domestic CU’s
Wylex and Crabtree do a single module type which is DP
DP rcbos is definitely a consideration and necessary for that reason but you can have a domestic CU with just a mains switch isolator giving you your DP isolation and just single pole rcbo’s for the final circuits. Same principle for 3 phase, as long as the tails are subject to non movement and enter a ferrous material in a suitable gland etc, and are the insulated and sheathed typeI went with Wylex for that reason, but in my case it is more about ease of testing.
Another difference is in the UK a TT supply with a RCD incomer is relatively rare so you don't usually have to worry about a N-E fault tripping the RCBO and that, if single pole, will not isolate the N fault so the main incomer RCD might also trip.
Reply to Why does the UK use rings for sockets? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.