Hi guys got a job doing a kitchen / diner / utility room extension.
Customer wants a 2nd cu located in new utility room to feed extension.
Circuits = 1 x 32A cooker, 1x 16A boiler, 1 x 32a utility room sockets, 1 x 32A kitchen sockets, 1 x 6A lights.
Plan is split supply tails, feed 60A switch fuse, then 16mm swa clipped around outside of house from meter cupboard to new cu location, run approx. 20 meters.
My question is do you think 16mm is ok or should I run 25mm with regards to VD.
My calcs for 70 degree SWA =
2.8 x 60 x 20 / 1000 = 3.36V
then lighting circuit, roughly 20min length
29x6x20 / 1000 = 3.48V
3.48 + 3.6 = 6.84V
I am just under the 6.9V @ 3% VD allowed for lighting.
What do you guys reckon,is this a bit too close, do my calcs look ok.
Are my intended methods ok?
Guess I just lack a bit of confidence when it comes to design?
Thanks
Customer wants a 2nd cu located in new utility room to feed extension.
Circuits = 1 x 32A cooker, 1x 16A boiler, 1 x 32a utility room sockets, 1 x 32A kitchen sockets, 1 x 6A lights.
Plan is split supply tails, feed 60A switch fuse, then 16mm swa clipped around outside of house from meter cupboard to new cu location, run approx. 20 meters.
My question is do you think 16mm is ok or should I run 25mm with regards to VD.
My calcs for 70 degree SWA =
2.8 x 60 x 20 / 1000 = 3.36V
then lighting circuit, roughly 20min length
29x6x20 / 1000 = 3.48V
3.48 + 3.6 = 6.84V
I am just under the 6.9V @ 3% VD allowed for lighting.
What do you guys reckon,is this a bit too close, do my calcs look ok.
Are my intended methods ok?
Guess I just lack a bit of confidence when it comes to design?
Thanks
