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Edsta369
Questions regarding garage supply.
I have been asked to supply a garage/stables with some sockets, they are reluctant to have a CU due to cost and will be converting the whole space completely in the next 5 years or so and will do it ‘properly’ then and they just want some power out there for now.
There is a 32a MCB on the main CU in the house which feeds a junction box in what I believe to be 4mm T+E at the other end of the house which is around 10m from the CU. This junction box is just inside the wall of the house, where I would connect the T+E to some 4mm swa and then run the swa under the car park to the garage ( ducting is in place ). Around 15m to the first socket from the junction box then into another 2 stables ( there is 3 side by side ). I imagine I’ll use 40m of SWA from the junction box inside the house to last socket in the last stable, so 10m T+E and 40m swa, 50m in total. All 4mm.
The load used at one time should never exceed 4000w so 18 ish amps. A granny charger at night for their car and in the day a heater, speaker and a light for the home gym.
Voltage drop should be okay per my calculations. 50m, 4mm T+E, clipped in ceiling board.
Current carrying capacity of 4mm T+E can vary, I’m confused on the reference method. It is clipped but direct, in an open ish space in a wall, less then 100mm.
The swa is xlpe and rated to 42amps so no worries.
So my question is should I replace the 32A MCB for a 20A MCB?
Or should I upgrade the 4mm T+E to 6mm or would be 4mm okay and I’ll let the client know that in the future that would need upgrading.
I know this may appear basic to some, I’ve just entered into more domestic electrics and was doing a lot of fault finding and testing before. I’ll be thankful of any help and tips.
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I have been asked to supply a garage/stables with some sockets, they are reluctant to have a CU due to cost and will be converting the whole space completely in the next 5 years or so and will do it ‘properly’ then and they just want some power out there for now.
There is a 32a MCB on the main CU in the house which feeds a junction box in what I believe to be 4mm T+E at the other end of the house which is around 10m from the CU. This junction box is just inside the wall of the house, where I would connect the T+E to some 4mm swa and then run the swa under the car park to the garage ( ducting is in place ). Around 15m to the first socket from the junction box then into another 2 stables ( there is 3 side by side ). I imagine I’ll use 40m of SWA from the junction box inside the house to last socket in the last stable, so 10m T+E and 40m swa, 50m in total. All 4mm.
The load used at one time should never exceed 4000w so 18 ish amps. A granny charger at night for their car and in the day a heater, speaker and a light for the home gym.
Voltage drop should be okay per my calculations. 50m, 4mm T+E, clipped in ceiling board.
Current carrying capacity of 4mm T+E can vary, I’m confused on the reference method. It is clipped but direct, in an open ish space in a wall, less then 100mm.
The swa is xlpe and rated to 42amps so no worries.
So my question is should I replace the 32A MCB for a 20A MCB?
Or should I upgrade the 4mm T+E to 6mm or would be 4mm okay and I’ll let the client know that in the future that would need upgrading.
I know this may appear basic to some, I’ve just entered into more domestic electrics and was doing a lot of fault finding and testing before. I’ll be thankful of any help and tips.
Questions regarding garage supply. to Continue reading...
ElectriciansForums.net for the latest in electricians' jobs, news, advice and more