Have been trying to work this out and as much as i can get most of it. Some things still confuse me. Ok from the PEER workbook Appendix C worsheet D.

Determine the maximum demand of a single domestic electrical installation supplied with single phase having the following load.


19 lighting points
6 10A double socket outets
16 single socket outlets
1 15A socket outlet
1 20A socket outlet
3 50W exaust fans
3 1000W strip heaters
12.4kW range
1 4.6kW instantaneous water heater
4 500W lights for tennis court

Ok heres what i undertsand

Load group A(i) 19 lighting points= 3A
3X 50W exaust fans = 135? points going from an example in the regs
So 3+2+2+2=9?

Load group A(ii) 500W lights = non applicable?
Load group B(i) 6 double sockets+16 single sockets =22points?
3 x 1000W strip heaters = 3points(using another example in the book ie 1point for one 1000W heater.) where is this info?
Load group B(ii) 1 x 15A socket outlet = 10A?
Load group B(iii) 1 x 20A socket outlet = 15A?
Load group C 12.4kW range = _____ x 05=______Where do i get this info?
Load group F - water heater 4.6W = ____A?

I hope this makes sense to someone. Help please.

does this make sense

Hi ,

Please clarify where did you get 2amps for fan.

I assume that 19 lights plus 3 x 50w fan

total 22 lights = 3A + 2A.

is this correct.

please give a feed back

will be appreciated.
thanks

yes that is correct

Can neone plz tell that how many questions in total comes in wiring rule exam in peer

Thanks mate.

Sort of. I dont get this.

Its 4 X 500w = 2000/230 x .75 = 6.25.

hope that explains.

Ok. Before i move on to the next one in the book. I want to make sure i understand this and have it right. I have changed the above to what i think it has to be now. Sorry if it seems like I'm being stupid. But i just cant see it sometimes. Once its pointed out. Its the light bulb going on.

Ah! Ok. I forgot it was times 4. lol Does the rest look right?

Load group A(i) 19 lighting points= 3A
3X 50W exaust fans = 2A total 3+2 = 5A

Load group A(ii) 500W lights = 4 x 500W = 2000W/230 x 0.75 = 6.5A
Load group B(i) 6 double sockets+16 single sockets =22points?
3 x 1000W strip heaters = 3points= 22+3=25points so 10A+5A=15A?
Load group B(ii) 1 x 15A socket outlet = 10A
Load group B(iii) 1 x 20A socket outlet = 15A + base loading of 15A= 40A?
Load group C 12.4kW range = 12400/230= 53.9(54) 54x 0.5= 27A
Load group E - water heater 4.6W = 4600/230= 20A x 0.33= 6.66A

So overall total would be 100A?

The rest is right except, Group B(iii) is 1x 20 amps socket = 15amps

Total demand is about 85.15amps.

Ok thanks. will attempt the next sheet maybe tomorrow and post back here to see if I'm right.

The correct answer is 95.16 amps