Question

A single storey domestic house comprises 4 bedrooms, kitchen, 2 bathrooms, 1 laundry. A
separate garage situated approximately 20m away from the main house. The present
electrical installation comprises
-> 2 off lighting points for each major room of the house
-> 3 off double power outlets for each major room
-> 1 off single outlet for the bathroom
-> 2 off double outlets for the laundry
-> 2 off 50W exhaust fans (bathroom and kitchen)
-> Electric cooking range comprising 3000W hotplates and 3000W oven
-> 3000W clothes dryer
-> 2 lighting points and 2 double power outlets in garage.
-> External porch, corridor and back of house external lighting, 4 points in total
-> The garage has 2 off lighting points, 2 off double power outlets, 1 off 15A outlet, and is
supplied through a sub-mains cable that feeds a sub-board located in the garage.
Calculate the maximum demand for this installation, assuming a nominal 230V AC supply.

Answer 1

Steps &Applicn . ( Poivk) cand Ampue Calculate No ()Single off point (4x 2) = 8 - 0 Bedom kitchen = 2 bathrom x i Garage Extermal - 2 - 16 Point Total Doubl pow off points. Bedm ux3 2 Launclany Garage 1X2 ax 2 6 Poit Total (16+ (16x)XiS A Total Ampe me qumud - 720 A Total Ma Powen denand) by ouru W 720x 230 = 16S 600 WaTT B) othr Ap pliances total olemomd Hot plate 200ow Oven clryer 3000 W Exhaust ned with cSMiaxj itDemand wi w2_= 17 40owatt- 74-7kwa CamScanner