an_elec_eng
Member
Hiiii, i have single deweling unit .i want to calculate c.b & feeder size . I applied demand factors And get the demand load Ampere To size c.b : demand load ampere *1.25 . My question sometimes iam getting the value like such as 56 AMPERE AND SHNIDER C.B SELECTED
In this case i have 56 ampere i want to know go next standard 63 AT or previouse 50 AT ampere my consultant engineer told to me apply 5% rule for c.b 50 A 5% is 2.5 the max ampere 52.5 if the current more than this value must be 63A C.B SELECTED. ,for 63A c.b 5% is 3.1 the max ampere is 66 if the current is more than this value .must be 80A c.b selected .finally,this rule is correct or not
Please help me
In this case i have 56 ampere i want to know go next standard 63 AT or previouse 50 AT ampere my consultant engineer told to me apply 5% rule for c.b 50 A 5% is 2.5 the max ampere 52.5 if the current more than this value must be 63A C.B SELECTED. ,for 63A c.b 5% is 3.1 the max ampere is 66 if the current is more than this value .must be 80A c.b selected .finally,this rule is correct or not
Please help me