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Maximum demand, Please explain.

Maximum demand, Please explain.

Old Jun 14th 2010, 5:29 am
  #1  
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Default Maximum demand, Please explain.

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.
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Old Jun 14th 2010, 11:26 am
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Default Re: Maximum demand, Please explain.

Originally Posted by Jockstar
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.
does this make sense
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Old Jun 14th 2010, 2:22 pm
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Default Re: Maximum demand, Please explain.

Originally Posted by Lee and Joanne
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
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Old Jun 16th 2010, 8:30 am
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Default Re: Maximum demand, Please explain.

Originally Posted by Askar
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
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Old Jun 16th 2010, 8:39 am
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Default Re: Maximum demand, Please explain.

yes that is correct
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Old Jun 16th 2010, 8:48 am
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Default Re: Maximum demand, Please explain.

Can neone plz tell that how many questions in total comes in wiring rule exam in peer
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Old Jun 16th 2010, 1:36 pm
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Default Re: Maximum demand, Please explain.

Thanks mate.
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Old Jun 17th 2010, 6:58 am
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Default Re: Maximum demand, Please explain.

Originally Posted by Lee and Joanne
does this make sense
Sort of. I dont get this.

Load group A(ii) 500W lights = non applicable? .75% OF CONNECTED LOad 6.25A
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Old Jun 17th 2010, 7:12 am
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Default Re: Maximum demand, Please explain.

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

hope that explains.
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Old Jun 17th 2010, 7:17 am
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Default Re: Maximum demand, Please explain.

Originally Posted by Jockstar
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.
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.
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Old Jun 17th 2010, 7:29 am
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Default Re: Maximum demand, Please explain.

Originally Posted by Askar
Its 4 X 500w = 2000/230 x .75 = 6.25.

hope that explains.
Ah! Ok. I forgot it was times 4. lol Does the rest look right?
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Old Jun 17th 2010, 7:33 am
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Default Re: Maximum demand, Please explain.

Originally Posted by Jockstar
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?
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Old Jun 17th 2010, 9:05 am
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Default Re: Maximum demand, Please explain.

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

Total demand is about 85.15amps.
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Old Jun 17th 2010, 11:06 am
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Default Re: Maximum demand, Please explain.

Originally Posted by Askar
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.
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Old Jun 17th 2010, 9:20 pm
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Default Re: Maximum demand, Please explain.

The correct answer is 95.16 amps
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