Discuss Outdoor building/stable in the Electrical Forum area at ElectriciansForums.net

Rocboni

Regular EF Member
Messages
354
Location
Scotland
Hi all,

Pricing for a supply to a 25x 10M steel frame shed around 100M from a bungalow, one section is going to be partitioned to create a stable area.

Is there any requirement for a 300ma S type RCD?, I wouldn’t really class it as agriculture. Only 2 double sockets well away from the stable area In the tack room.

Thanks
 

R-fur

EF Member
Messages
18
Location
Ayrshire
I would class it as agriculture as horses are just as easy to kill as cows.
I would also consider bonding the shed to a local earth spike.
 
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Rocboni

Rocboni

Regular EF Member
Messages
354
Location
Scotland
Just Been out for a look, supply is TNCS. I shall TT the outbuilding with 100mA s type at the mains position. Bonding the metalwork and an additional earth spike. 16mm 2 core to the shed. All final circuits will have 30mA RCD protection
 

davesparks

Forum Mentor
Messages
12,803
Location
guildford
Just Been out for a look, supply is TNCS. I shall TT the outbuilding with 100mA s type at the mains position. Bonding the metalwork and an additional earth spike. 16mm 2 core to the shed. All final circuits will have 30mA RCD protection
Why the 100mA RCD at the mains position? The submain will be connected to the Tncs earthing system so won't need it.
 
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wirepuller

Forum Mentor
Messages
5,531
Location
south uk
Just Been out for a look, supply is TNCS. I shall TT the outbuilding with 100mA s type at the mains position. Bonding the metalwork and an additional earth spike. 16mm 2 core to the shed. All final circuits will have 30mA RCD protection
Why the 100mA RCD at the mains position? The submain will be connected to the Tncs earthing system so won't need it.
Far better to do what Dave has suggested, if you use a 100ma S type at source and use RCBO's for the final circuits you will have to use DP RCBO's. This is because standard RCBO's are SP and when tripped will not disconnect a N-E fault possibly resulting in the 100ma device tripping as well. This is commonly overlooked on TT systems.
 
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Rocboni

Rocboni

Regular EF Member
Messages
354
Location
Scotland
So earth the armour from using the TNCS earth and isolate from then TT earth and Carey on as Normal
 

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