Working out Maximum Demand

[Norv]

Right then, I'm filling out a Domestic Electrical Installation Cert & its asked for Maximum Demand. It says nothing about using diversity on the cert but in my Inspection, testing & cert book it says you can make an allowance for diversity.

The circuits in my CU are

Final ring for sockets (upstairs & downstairs) - 32A
Radial for lights (upstairs & downstairs) - 6A
Radial to garage - 32A
Radial to combi - 16A (Isolated with a 3A fuse in FCU)

Would my MD be 51.76A

This is how I worked it out

Sockets 32A + lights (66% of 6A)=3.96A + garage (40% of 32A)=12.8 + combi 3A.

 

[Adam_151]

52A then (or even 50A would be fine, or 55A if you want to be fussy and not round it down)

Giving it to two decimal places is quite meaningless

I'm reminded of the story of the blonde girl in the museum who when asked how old an exhibit is, answers 5,003 years, when the tourist responds about the marvels of modern technology and how they can date it so accuratly and goes onto ask about it, she erely replies that the archaeologists had dated it at 5,000 years old, and that was 3 years ago...

 

[Norv]

Thanks for confirming that Adam_151. I originally put down 52A & then changed it cause I thought someone might say it was 51.76.

oh & I'm not blonde