Alexphd1 Posted August 13, 2020 Share Posted August 13, 2020 What size of cable between two consumer units in the house. In between sparkies and would like to get cable run in to keep job moving. @ProDave you dont fancy coming down to the bluetoon for a days work? Link to comment Share on other sites More sharing options...
ProDave Posted August 13, 2020 Share Posted August 13, 2020 Distance between them and loading? If I came down to Aberdeen I would have to quarantine at the moment? Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 13, 2020 Share Posted August 13, 2020 11 minutes ago, Alexphd1 said: What size of cable between two consumer units in the house. In between sparkies and would like to get cable run in to keep job moving. @ProDave you dont fancy coming down to the bluetoon for a days work? Is the second CU being fed off a 50A breaker in the first CU? Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 13, 2020 Author Share Posted August 13, 2020 (edited) No quarantine here (yet), Aberdeen is 35 miles away. I think it was being split before CU. We have power coming into garage with a 12 way CU (which we are using just now) then another 12 way CU in the house for main house load. Garage CU over sized should have been a 6 way. Approx 12m between CU. Edited August 13, 2020 by Alexphd1 Link to comment Share on other sites More sharing options...
ProDave Posted August 13, 2020 Share Posted August 13, 2020 9 minutes ago, Alexphd1 said: No quarantine here (yet), Aberdeen is 35 miles away. I think it was being split before CU. We have power coming into garage with a 12 way CU (which we are using just now) then another 12 way CU in the house for main house load. Garage CU over sized should have been a 6 way. Approx 12m between CU. Then 16mm should be fine. I run our whole house on 16mm over a 22 metre run. It will need to be fed in the garage from a switch fuse with an 80A fuse. Tails split with henley blocks if not already there (picture of what's in the garage please?) You really really really want to avoid having to have an RCD for this in the garage. So this will mean either SWA cable, or if you can route the cable on the surface or in trunking you could use twin and earth. Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 13, 2020 Author Share Posted August 13, 2020 Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 13, 2020 Share Posted August 13, 2020 (edited) Henley blocks into those tails, into a metal clad switch fuse with an 80A fuse, and then SWA between the switch-fuse and the house CU. Not sure on 18th ed specifics, but my spark refused to run 16mm2 tails over 18m distance, even off an 80A fuse, mainly due to it being an all-electric dwelling ( so assume he worked out the loads and insisted on 25mm2 ). Future plans for an EV(?) and can the EV charger be fed from the garage CU? If so, that would future proof the install against any adverse loads being added to the house CU retrospectively. Edited August 13, 2020 by Nickfromwales Link to comment Share on other sites More sharing options...
ProDave Posted August 13, 2020 Share Posted August 13, 2020 So split the tails between the isolator switch and the CU's. Why 2 CU's in the garage? that's a lot? Is the house joined to the garage? Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 13, 2020 Author Share Posted August 13, 2020 The little CU came from the solar pv installation. Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 13, 2020 Share Posted August 13, 2020 @Alexphd1 Can't you condense into that PV CU and steal that 12 way for the house? Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 13, 2020 Author Share Posted August 13, 2020 Probably could combine them but not to bothered to be honest. Link to comment Share on other sites More sharing options...
ProDave Posted August 13, 2020 Share Posted August 13, 2020 6 minutes ago, Alexphd1 said: The little CU came from the solar pv installation. Solar PV installer "set in his ways" I might be inclined to suggest move the solar PV to the main garage CU to free up the space needed for the switch fuse. Or even re purpose the solar PV CU. 1 Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 13, 2020 Author Share Posted August 13, 2020 Splitting the meter tails and adding in a Henley block although pretty straight forward is firmly in the sparkies department. I just want run in the cable between so I can get the metal ducting covered up. Yeah you guessed it with pv installer! Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 13, 2020 Author Share Posted August 13, 2020 The 12 way CU in the house already half installed. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 13, 2020 Share Posted August 13, 2020 (edited) So question remains.....16mm2 or 25mm2 3-core SWA then. @ProDave ? 16mm2 won't leave much headroom over 12m IMO. Edited August 13, 2020 by Nickfromwales Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 13, 2020 Author Share Posted August 13, 2020 I was hoping not to use swa cable as it's in metal trunking all the way. Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 13, 2020 Author Share Posted August 13, 2020 @prodave I have a empty flat for digs if that sweetings the deal? Link to comment Share on other sites More sharing options...
ProDave Posted August 13, 2020 Share Posted August 13, 2020 16mm should be fine as long as fused at 80A Voltage drop won't be an issue over just 12 metres. If it's steel trunking all the way then I would fit 16mm twin and earth and drop in a 16mm earth cable as well Can you take the cover off the two garage CU's and post a picture inside? and a picture of the house CU with the cover off? Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 14, 2020 Author Share Posted August 14, 2020 I have read the riot act to the sparkie, he will make a appearance today.... he was planning to run in 25mm as it's a big house. Fingers crossed he shows up. Link to comment Share on other sites More sharing options...
ProDave Posted August 14, 2020 Share Posted August 14, 2020 Can you post the pictures of the two garage CU's with the covers off? Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 21, 2020 Author Share Posted August 21, 2020 Guess what... sparkie never showed. I am away to order 25mm cable but do I need 25mm for the earth or is 16mm enough. Here's some photos of garage solar & normal CU. The 2nd CU in the house is empty at the moment, I didnt bother with photos of that. Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 21, 2020 Share Posted August 21, 2020 (edited) 16mm earth, but why not use 3-core and then problem solved? You’ll have to split the 25mm core between two of the 16mm max ( iirc ) earth bar connections to make it off. Assume spark will do this so won’t be your prob. Either that or run a 2-core and zip tie the separate 16mm earth along its length. They need to stay together btw. Edited August 21, 2020 by Nickfromwales Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 21, 2020 Share Posted August 21, 2020 (edited) Nice to see that din rail mounted gen meter. Neat solution. The size of the second PV CU now makes sense. Edited August 21, 2020 by Nickfromwales Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 21, 2020 Author Share Posted August 21, 2020 I haven't seen 3 core 25mm, that would make life v easy. Link to comment Share on other sites More sharing options...
Alexphd1 Posted August 21, 2020 Author Share Posted August 21, 2020 Nick. If your speaking about 3 core 25mm SWA then I think it would be a PIA to install esp around bends. Link to comment Share on other sites More sharing options...
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