Maximum demand, Please explain.
#1
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.
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.
#2
Re: 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 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.
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.
#6
Just Joined
Joined: Dec 2008
Posts: 23
Re: Maximum demand, Please explain.
Can neone plz tell that how many questions in total comes in wiring rule exam in peer
#9
Just Joined
Joined: Jun 2010
Posts: 25
Re: Maximum demand, Please explain.
Its 4 X 500w = 2000/230 x .75 = 6.25.
hope that explains.
hope that explains.
#10
Re: 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 = 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.
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.
#12
Re: Maximum demand, Please explain.
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?
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?
#13
Just Joined
Joined: Jun 2010
Posts: 25
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.
Total demand is about 85.15amps.
#15
Just Joined
Joined: Dec 2008
Posts: 23
Re: Maximum demand, Please explain.
The correct answer is 95.16 amps