Hi
A good friend of mine is having a large electrical installation carried out in his garden.Hes had 3 prices from various electrical contractors regrading the install.
He is having a summer house built that will house
9kw 3 phase sauna
5kw hot tub
27kw 3 phase electric boiler
A 32 amp ring circuit for 2 x 3kw fan heaters
A 40amp circuit for 2 x 3 kw ( possibly more) electrical patio heaters
12 mains volt led down lights
The length of run is 25-30m the cable will be in 100mm ducting 600mm down installed by ground work contractors belonging to the landscape company
He has 3 phase in his house I was with 1 of the electricians as he walked round the job,the original 3 phase dist board has room for the correct breakers for a sub main ? cable to be run out to the new building.All the electricians have then specified 3 phase dist board with the appropriate breakers etc
2 of the quotes inc a 25mm 5 core cable
1 of the quotes inc a 16mm 5 core cable
The spec is quite involved and says about permissible volt drop and earth rods being installed which is common to all 3
1 of the quotes list a triple pole 100ma RCD to give greater protection to the sub main but the other 2 do not
They all specify 30ma RCBO's for the summer house distribution board
If any one help can I get clarification what size cable he does need please and woukld it be advisablke to fit the 100ma rcd ??
thanks
P
A good friend of mine is having a large electrical installation carried out in his garden.Hes had 3 prices from various electrical contractors regrading the install.
He is having a summer house built that will house
9kw 3 phase sauna
5kw hot tub
27kw 3 phase electric boiler
A 32 amp ring circuit for 2 x 3kw fan heaters
A 40amp circuit for 2 x 3 kw ( possibly more) electrical patio heaters
12 mains volt led down lights
The length of run is 25-30m the cable will be in 100mm ducting 600mm down installed by ground work contractors belonging to the landscape company
He has 3 phase in his house I was with 1 of the electricians as he walked round the job,the original 3 phase dist board has room for the correct breakers for a sub main ? cable to be run out to the new building.All the electricians have then specified 3 phase dist board with the appropriate breakers etc
2 of the quotes inc a 25mm 5 core cable
1 of the quotes inc a 16mm 5 core cable
The spec is quite involved and says about permissible volt drop and earth rods being installed which is common to all 3
1 of the quotes list a triple pole 100ma RCD to give greater protection to the sub main but the other 2 do not
They all specify 30ma RCBO's for the summer house distribution board
If any one help can I get clarification what size cable he does need please and woukld it be advisablke to fit the 100ma rcd ??
thanks
P