Hi, I have a job coming up to replace a CU. It has failed a few tests so has to be replaced. It is a large house and the board is a two tier one so will replace with similar. Whilst surveying the old board I noticed two 63 amp mcb's one supplying an extension to the house this has a ring and lighting in it so could be down graded to a 40 amp. The other one is feeding the garage via a 16mm swa, on inspection I found that the garage has a CU in it which feeds a ring, lighting and heating and filtration for the swimming pool. The SWA surfaces at the house close to the meter cupboard. My question is can I terminate the swa in the meter cupboard using an adaptable box and a small 80 amp switch. The wylex etc are all to big to fit in a meter cupboard.
W
Wilko
Sorry, but I can't help asking ... what's the earthing and bonding for the house and shed?
Re the Switch : Maybe I've misunderstood but why not take SWA right up to the new CU? These days the adaptable with switch would prob need to be metal anyway. And again apologies, but do you need the switch? Isn't there isolation from mcb and the main DP switch?
Re the Switch : Maybe I've misunderstood but why not take SWA right up to the new CU? These days the adaptable with switch would prob need to be metal anyway. And again apologies, but do you need the switch? Isn't there isolation from mcb and the main DP switch?
What "tests" did the old CU fail on.
Id like to know this also??!!
Wilko id probably back the OP's idea of using a switch fuse for garage for discrimination.
OP what cable is supplying the extension db?
W
Wilko
Agreed!
Rather than another box, would one of these work if there's plenty of room?
125A MS Modular Fuse Holder Grey (Sold in 1's) | City Electrical Factors - http://www.cef.co.uk/catalogue/products/1780321-125a-ms-modular-fuse-holder-grey-sold-in-1-s
View attachment 35358
The only "failed test" which comes to mind is an rcd in a split load or dual rcd board. But they are replaceable if still available.
Hi Guys, Sorry for delay in replying, have been trying to upload some pictures from my phone. It is not playing today. will try again in a minute. To answer questions. CU failed mainly because the RCD/main switch is 100ma and would not trip at all on X5. The RCD has two inputs and two outputs per L and N one for each bus bar of the two tier board. The person that installed it has spilt the tails in two to feed both bars. Pictures will tell what I mean. A colleague of mine has suggested that the RCD is a 3 phase one. All looks a mess. The reason that I am wanting to run sub main is to take the load of the house CU as without further investigation I think the garage load is high with pool etc. Will upload pictures ASAP.
You don't test 100ma rcd at x5.
How many terminals does this rcd have you must surely know a triple-pole from a double-pole.
Butchery Just Butchery the git that did that want's shooting slowly
That is novel never seen that before.
Looks like one that I can across in Afghanistan. 4 pole rcds were the normal and cheap cable to compliment the shoody install.
That lot needs sorting out!
That lot needs sorting out!
now you've upset our dogs. they don't think their turds are anywhere near as bad as that cat's abortion of a DB.
P
PEG
I have had a good study of the pics,and with the "ingenious" method of pole doubling,and the otherwise tidy-ish rest of the board...i am going to take a wild and unpopular guess,that the person who is responsible,probably turned up,all liveried and schemed...
I have seen many similar set-ups,and they don't all arrive on a horse
I have seen many similar set-ups,and they don't all arrive on a horse
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