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Determine the maximum demand (MD) using diversity of an installation which has an 8-way consumer unit with a main switch rated at 100amp. it has two ways and supplies six circuit at follows.
one 10.5kw cooker circuit with no socket outlet on the control unit
two 32a ring final circuits
one 2kw immersion heater
two lighting circuits ; circuit 1 consists of 60w tungsten lamp and circuit 2 has 25 fluorescent lamps.
use IEE allowance diversity table.
Table 6.2 - Allowance for diversity
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
HouseholdsSmall shops, stores, officesHotels, guest houses
Lighting66% total demand90% total demand75% total demand
Heating and power100% up to 10 A + 50% balance100%X + 75%(Y+Z)100%X + 80%Y + 60%Z
Cookers10 A + 30% balance + 5 A for socket100%X + 80%Y + 60%Z100%X + 80%Y + 60%Z
Motors (but not lifts) 100%X + 80%Y + 60%Z100%X + 50%(Y+Z)
Instantaneous water heaters100%X + 100%Y + 25%Z100%X + 100%Y + 25%Z100%X + 100%Y + 25%Z
Thermostatic water heaters100%100%100%
Floor warming installations100%100%100%
Thermal storage heating100%100%100%
Standard circuits100%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
Determine the maximum demand (MD) using diversity of an installation which has an 8-way consumer unit with a main switch rated at 100amp. it has two ways and supplies six circuit at follows.
one 10.5kw cooker circuit with no socket outlet on the control unit
two 32a ring final circuits
one 2kw immersion heater
two lighting circuits ; circuit 1 consists of 60w tungsten lamp and circuit 2 has 25 fluorescent lamps.
use IEE allowance diversity table.
Table 6.2 - Allowance for diversity
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
HouseholdsSmall shops, stores, officesHotels, guest houses
Lighting66% total demand90% total demand75% total demand
Heating and power100% up to 10 A + 50% balance100%X + 75%(Y+Z)100%X + 80%Y + 60%Z
Cookers10 A + 30% balance + 5 A for socket100%X + 80%Y + 60%Z100%X + 80%Y + 60%Z
Motors (but not lifts) 100%X + 80%Y + 60%Z100%X + 50%(Y+Z)
Instantaneous water heaters100%X + 100%Y + 25%Z100%X + 100%Y + 25%Z100%X + 100%Y + 25%Z
Thermostatic water heaters100%100%100%
Floor warming installations100%100%100%
Thermal storage heating100%100%100%
Standard circuits100%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
