Originally Posted by Jockstar (Post 8631365)

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 correct +2A for fans =5A
3X 50W exaust fans = 135? points going from an example in the regs
So 3+2+2+2=9?read footnote c in notes to table c1-add to lights

Load group A(ii) 500W lights = non applicable? .75% OF CONNECTED LOad 6.25A
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? FOOTNOTE(i)lees than 10A add to B
Load group B(ii) 1 x 15A socket outlet = 10A?}footnote (J)
Load group B(iii) 1 x 20A socket outlet = 15A?
Load group C 12.4kW range = _____ x 05=______Where do i get this info? 12400/230 =53.9A 54A x 50% 27A
Load group F - water heater 4.6W = ____A? 4600/230 x 33.3%= 6.66A

I hope this makes sense to someone. Help please.

Originally Posted by Lee and Joanne (Post 8631861)

does this make sense

Originally Posted by Askar (Post 8632246)

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

Originally Posted by Lee and Joanne (Post 8631861)

does this make sense

Originally Posted by Jockstar (Post 8631365)

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 = 2A total 3+2 = 5A

Load group A(ii) 500W lights = Still not sure how you get that.
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

I hope this makes sense to someone. Help please.

Originally Posted by Askar (Post 8638229)

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

hope that explains.

Originally Posted by Jockstar (Post 8638247)

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

Originally Posted by Askar (Post 8638358)

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

Total demand is about 85.15amps.