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Discuss Garage Board - achieving discrimination? in the UK Electrical Forum area at ElectriciansForums.net
LOL. You obviously prefer separates.I haven't
I am the only one at my company who doesn't use an mft. People seem to waste hours fiddling with the leads and my boss thinks I am mad but my 20 year old rcd tester still does the job. Get the usual comments every time at our yearly assessment.LOL. You obviously prefer separates.
My ins/cont tester is analogue
Absolutely. It's surprising how many people are unaware of this - that circuit breakers to BS EN 60898 of any rating in series will not discriminate.There's no discrimination betweeen the MCBs, so the design is flawed. You'd need a FUSE ate the source end.
Absolutely. It's surprising how many people are unaware of this - that circuit breakers to BS EN 60898 of any rating in series will not discriminate.
It would discriminate between overcurrent but not necessarily fault current. What about a type B, 2A protected by a type D, 63A would the sweeping statement cover this too.
I don't know I was responding to #48 but I would put money on discrimination under fault conditions and the 2A would go. It was a rather sweeping statement.You tell me Westward, only too willing to learn.
I don't know I was responding to #48 but I would put money on discrimination under fault conditions and the 2A would go. It was a rather sweeping statement.
So if I had a 20A breaker supplying a radial socket circuit from the garage board, and there was a fault on that circuit - are you saying the 20A wouldn't trip independently of the 40A at the house end?There will be no discrimination with mcbs in series except maybe in in westwards case but i think in the situation were it just a supply to a garage with a light and a socket in it i would not be to worried, what the worst that going to happen , you have a fault current on the socket circuit and so it trips the local mcb in the garage and the mcb in the house , not the end of the world , i have seen loads of commersial sites with 3 or 4 mcbs in series and 30ma rcds in series ,and yes a right old bodge in my opinion, but when you speak to the customer they say they have never had any problems so why change it . Even when i have explained the disruption it could course, they would rather put up with that than pay for an mccb board and rewiring
No i am saying thay would both trip at the same time if there was a fault current , but if you just overloaded the 20 amp mcb by less that 40 amps then only the 20amp mcb would tripSo if I had a 20A breaker supplying a radial socket circuit from the garage board, and there was a fault on that circuit - are you saying the 20A wouldn't trip independently of the 40A at the house end?
He has quite an unecessarily complicated installation.were it just a supply to a garage with a light and a socket in it i would not be to worried,
The garage board is a dual board with an rcd main switch. At present I have it connected with rcds on both sides,
Sorry by dual I didn't mean a split board - just two way, i.e. two breakers - purpose garage board.He has quite an unecessarily complicated installation.
For some reason he has this
While this is an occassional use outbuilding, it has the potential for something much more substantial in the future.
Reply to Garage Board - achieving discrimination? in the UK Electrical Forum area at ElectriciansForums.net
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