What size cable

Question

Hi, to get electrics to a garden office, what size 3 core SWA cable required? 16mm or 25mm?
Garden office has 2kw panel heater, 8.5kw electric shower, 4 double sockets, a fridge/freezer unit, microwave, coffee machine, and 11 downlights.
I calculated around 100amps usage at any one time.
Distance from house fuze box to garden office around 30-40 meter.
Half overground, half underground. 

Any other tips welcome. (i. e. 4 core better idea?) 

Thank you.
P

Richard · Accepted Answer

I would be running in 16mm swa can run up to 80a 
This should be fine considering diversity , ( won’t be pulling full load all at once ) 
Also your main fuse in domestic house is max 100a 
So may need a fresh supply off grid if house is drawing lots and garden office ! May be worth reconsidering electric shower ? 
Cheers Richard

Bruno · Answer

The electrician should be abble to calculate the cable size when running the cable design the CU and finish with the EIC.

Perwez · Answer

Hi you need to get the 16mm cable. If you need any assistance or more information contact me on my number 07840 1922

Callan · Answer

16mm 3core armoured cable should be plenty don’t forget your smoke alarm

Harpal · Answer

Hi you need to get the 16mm 3core armoured  cable.

Richard · Answer

I haven't spent any time doing calcs' but off the top of my head and not going over the top I would say that 16mm 3core swa would be sufficient taking diversity into account & backed by a 60amp Switch Fuse.

William · Answer

You will more than likely not run all the electrics at the one time so the likelihood that you run 100A would be slim. If you think that is a possibility I would consult your local DNO (ie Scottish power / northern power grid) as the main fuse at your house may not be large enough to run both supplies.

Patrick · Answer

A 16mm cable should be sufficient for the Electric load and voltage drop.

Octavian · Answer

25mm will do all the amps surely 
16mm you're limited to use only one at the tike like you says

Good luck

Connor · Answer

Good afternoon sir Connor from Reed and sons electrical 25mm would be the better option

What size cable

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