Maximum demand

[Maxdem]

I'm looking through the OSG and trying to work out the diversity to apply to ring circuits when assessing for maximum demand and am stuck between 100% of total demand up to 10A plus 50% of remainder, so for two ring circuits would be 2(10 + 11) = 42A.
Or is it 100% of first circuit + 40% of second circuit which would be 32 + 12.8 = 44.8A.
Not a lot between them but I'd be happier if I knew for sure which is the correct way to calculate this.

 

[bondy]

osg. page 84. para 4.

 

[Maxdem]

yeah I read that the first time but perhaps got carried away, before the end of the paragraph, to table 1b.
so if this is saying the max demand for two standard ring circuits is 2 X 32 = 64A with no diversiy to be applied, what exactly are we applying diversity to, in table 1b at section 2 and 9 (especially 9)?

 

[Maxdem]

Anyone have any input on this before it ends up deep in the pile?

 

[cozycats]

If you're looking at filling in the forms. I usually put , <(main fuse rating) (if i know it) or <100a if i don't. Not really possible to work out max on a domestic. Another possibility is to turn everything on and using a clampmeter measure the load on the incoming tails!!!!!