Voltage Drop Tolerances

[Colonel Hathi]

Hi
I have been asked to provide power to a building at the foot of the customer's 30 metre garden (32A ring and 6A lighting circuits).

When I calculate the required cable size in terms of voltage drop, 6mm SWA is just over limits.
I am using 6.4 mV/A/m 36A Demand and 30 metre run.
6.4*36*30=6912mV - 6.912 volts
6.912/230=3.005%
The Regs seem quite specific - but is this close enough to the 3% max?
Going to 10mm cable would bring me right down to 1.78%

Any views much appreciated.

Thanks

CH

 

[Engineer54]

I doubt very much your going to see anything like a 26A loading at this shed. As mentioned many time's here, diversity, and commonsense often go hand in hand. Too many ''what ifs and ''maybes'' always tend to cloud the waters.

 

[rryles]

Maybe 1 or 2 500w TH floodlight may be fitted to illuminate the garden should also possibly taken into account?

In theory shouldn't happen. At least in England and Wales. 500W TH floods are very unlikely to be deemed to satisfy building regs part L.

 

[telectrix]

stuff part L . when all the government ( local and national ) leave all their office lights on all night. anyway, i ain't finished reading parts j and k yet. i got sidetracked by part pee.