Note the following abbreviations : 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
Type of final circuit
Type of premises
Households
Small shops, stores, offices
Hotels, guest houses
Lighting
66% total demand
90% total demand
75% total demand
Heating and power
100% up to 10 A + 50% balance
100%X + 75%(Y+Z)
100%X + 80%Y + 60%Z
Cookers
10 A + 30% balance + 5 A for socket
100%X + 80%Y + 60%Z
100%X + 80%Y + 60%Z
Motors (but not lifts)
100%X + 80%Y + 60%Z
100%X + 50%(Y+Z)
Instantaneous water heaters
100%X + 100%Y + 25%Z
100%X + 100%Y + 25%Z
100%X + 100%Y + 25%Z
Thermostatic water heaters
100%
100%
100%
Floor warming installations
100%
100%
100%
Thermal storage heating
100%
100%
100%
Standard circuits
100%X + 40%(Y+Z)
100%X + 50%(Y+Z)
100%X + 50%(Y+Z)
Sockets and stationary equip.
100%X + 40%(Y+Z)
100%X + 75%(Y+Z)
100%X + 75%Y + 40%Z
Extracted
from The Electricians Guide Fifth Edition by John Whitfield Published by EPA PressClick
Here to order your Copy