determining ib

[akcorbin]

sorry guys i know you probably get the same questions everyday but i need a little help jogging my memory from college days.

how would i go about working out (ib) if i wanted to install a new db in my shed from my house db.

It would be a 63A main switch and i would be feeding a 16amp radial in the shed, and two 6 amp lighting circuits.

thanks for the help.

 

[Guest55]

Ib , design current , is the sum of all loads with diversity applied , and a bit of common sense as to how each point is utilsed.
Appliances used in the shed ?

 

[mickys86]

If it was me..... I'd take a good read of the osg

 

[akcorbin]

It would probably only be a fridge that is permanently on and then my lawn mower or radio now and again.

 

[Guest55]

It would probably only be a fridge that is permanently on and then my lawn mower or radio now and again.

So lets say 10-13A for your power.
How many lights and type ?

 

[akcorbin]

With the lighting circuits I would have 1 feeding 10 x 6 watt decking lights and another feeding 2 x 500w security lights.

 

[Guest55]

So another 4-5A of lighting.
Making a total max demand of 18A in normal service.
Thus a 20A supply should suffice.

 

[akcorbin]

Thanks very much for the help biff.