calculating total consumption for each of the circuits and final maximum demand curre

[jan21]

I have to calculate the total consumption for each of the circuits and state the final maximum demand current.

downstairs :2 fittings with 5x 12w lamps,1 fitting with 5 x 12w
1 fitting with 10 x 12w,1 fitting with 1 x 60w,1 fitting with 7 x 20w
2 fitting with 3 x 20w,1 fitting with 4 x 30w and 2 fitting with 1 x 20w,cooker 5.1kw

upstairs: 1 fitting with 5 x 12w,3 fitting with 1 x 20w,1 fitting with 1 x 60w, 1 fitting with 1 x 60w, 1 fitting with 1 x 60w, 1 fitting with 5 x 12w and 4 fitting with 1 x 20w. shower 9.8kw

Also , Upstairs: 10 sockets and Downstairs: 13 sockets and 4 fuses.

So far I've got:

Downstairs:

780w x1.8 / 240 = 5.85a

Kitchen cooker power consumption: 5100 w
x 1.8 / 240 = 38.25a
10a + 11.48a + 5a= 26.48
Upstairs
440w x 1.8 / 240 = 3.30a
Bathroom shower power consumption:
9800w x 1.8 / 240 = 73.5a
Upstairs: 10 sockets
100%X + 40%(Y+Z)

Downstairs: 13 sockets and 4 fuses
100%X + 40%(Y+Z)

13a13 - 60% = 5.2 = 13+5.2 = 18.2 seems wrong! ?
X is the full load current of the largest appliance or circuit
Y is the full load current of the second largest appliance or circuit
Z is the full load current of the remaining appliances or circuits

 

[Marvo]

Re: calculating total consumption for each of the circuits and final maximum demand c

Welcome to the forum. Is this a college homework question?

 

[Pete999]

Re: calculating total consumption for each of the circuits and final maximum demand c

Look up diversity in either OSG or BS 7671

 

[hightower]

Re: calculating total consumption for each of the circuits and final maximum demand c

What's the x1.8 for? Thought that 1.8 factor was only applied to discharge lighting?

 

[flashh]

Re: calculating total consumption for each of the circuits and final maximum demand c

he's other question is pretty good too!