Applying diversity?

[andrew692003]

I'm going to be wiring an extension(3 floors) to a retail unit which will need a new supply as the demand is quite high already(high 80's on all phases through the day).

Anyway I've totaled up the loads for each floor into Lighting and Power and Storage Heating but I'm not too sure how to apply the diversity to it, can anyone help?

Cheers

 

[J@mes]

100% of the lighting
100% of the next largest load (probably the storage heaters?)
40% of everything else

Is how I would do it I think!

 

[Goody]

Check this out...

http://www.electriciansforums.net/e...s-electrical-regulations/18827-diversity.html


Cheers!

 

[andrew692003]

Just checked the On-site Guide and found this:

Lighting - 90% of total current demand
Heating - 100% of largest appliance & 75% of the rest.
Power - 100% of largest point 70% of every other point.

Lighting - I take it that means add all my lighting points up and take away 10% to give total.

Heating - Straight forward.

Power - Do I count up the number of Ring Mains and use the first Ring at 100% and the others at 70%?

If I do that I end up with this:

Lighting - 6400w to 5760w

Heating - 27200w to 21760w

Power - 11 Rings at 32A = 61440w

What do you think, does that look anywhere correct?

Cheers