The document describes the circuits and loads for an electrical installation. It lists 19 circuits with various lighting, power outlet, motor, and appliance loads. It calculates the demand current in amps for each phase based on adding the full load or percentage of full load for each circuit based on rating and number of devices. The highest calculated demand is 153.25 amps on phase L2. With a 10% allowance for future additions, the total recommended maximum current is 168.575 amps.

1. Circuit
Function L1 L2 L3
Number
✔ ➜➜
12 twin 36 W fluorescent lighting
1 Move to L3 ✔
fittings at 0.4 A per fitting
Circuit
12 twin 36 W fluorescent lighting
2 ✔
fittings at 2.2 A per fitting
3 3 Highbay MV light fittings ✔
3 3 Highbay MV light fittings ✔
5 ✔
7 double 10 A outlets
6 7doube10Aoutlets ✔
7 6 double 10 A outlets ✔
8 2 x 15 A single-phase outlet ✔
9 2 x 15 A single-phase outlet ✔
10 15 A three-phase outlet ✔ ✔ ✔
11 15 A three-phase outlet ✔ ✔ ✔
12 Single-phase range ✔
13 Instantaneous water heater ✔
14 -16 4 kW, three-phase motors ✔ ✔ ✔
16 - 19 5.5 kW, three-phase motors ✔ ✔ ✔

2. Circuit
Function L1 L2 L3
Number
✔ ➜➜
12 twin 36 W fluorescent lighting
1 Move to L3 ✔
fittings at 0.4 A per fitting
Circuit
12 twin 36 W fluorescent lighting
2 ✔
fittings at 2.2 A per fitting
3 3 Highbay MV light fittings ✔
3 3 Highbay MV light fittings ✔
5 ✔
7 double 10 A outlets
6 7doube10Aoutlets ✔
7 6 double 10 A outlets ✔
8 2 x 15 A single-phase outlet ✔
9 2 x 15 A single-phase outlet ✔
10 15 A three-phase outlet ✔ ✔ ✔
11 15 A three-phase outlet ✔ ✔ ✔
12 Single-phase range ✔
13 Instantaneous water heater ✔
14 -16 4 kW, three-phase motors ✔ ✔ ✔
16 - 19 5.5 kW, three-phase motors ✔ ✔ ✔

3. Description Current allowance Demand
Circuit Load Group of load per unit Calculation (Amps)
No (column 1) (given list) (column 2) L1 L2 L3
1 12 twin
A 36 W Full connected load 12 X 0.4 = 4.8 ➜➜ 4.8
fluorescent
2 12 twin
A 36 W Full connected load 12 X 0.4 = 4.8 4.8
fluorescent
3 A 3 Highbay MV Full connected load 3 X 2.2 = 6.6 6.6
4 A 3 Highbay MV Full connected load 3 X 2.2 = 6.6 6.6
5 7 double 1000 W for 1st outlet + 750 each additional (1000 + (13 X 750))
B(i) 46.7
10 A outlets = 14 points outlet / 230
7 double
(1000 + (13 X 750))
6 B(i) 10 A outlets 1000 W for 1st + 750 each additional outlet 46.7
/ 230
= 14 points
7 6 double (1000 + (11 X 750))
B(i) 1000 W for 1st + 750 each additional outlet 40.2
10 A outlets = 12 points / 230
8 2 x 15 A single phase
B(iii) outlets 15 + (15 X 0.75) 26.25
Full current rating of highest outlet + 75% (x
9 2 x 15 A single phase 0.75) full current rating of remainder
B(iii) 15 + (15 X 0.75) 26.25
outlets
10 This is the highest rated
B(iii) 15 A three phase outlet 15.0 15.0 15.0
11 B(iii) 15 A three phase outlet 15 x 0.75 11.3 11.3 11.3
12 C Single phase range Full connected load current 6400 / 240 26.7
13 C Instant hot water heater Full connected load current 2400 / 240 10.0
14 D 4 kW three phase motor 8.5 x 0.5 = 4.3 4.3 4.3 4.3
15 D 4 kW three phase motor 8.5 x 0.5 = 4.3 4.3 4.3 4.3
16 D 4 kW three phase motor Full load of highest rated motor + 75% (x 8.5 x 0.5 = 4.3 4.3 4.3 4.3
17 D 5.5 kW three phase motor 0.75) of full load of second highest rated Highest rated motor 11.7 11.7 11.7
18 motor, + 50% of full load of remainder 0.75 x 11.7 = 8.8
D 5.5 kW three phase motor (second highest 8.8 8.8 8.8
rated motor)
19 D 5.5 kW three phase motor 0. 5 x 11.7 = 5.8 5.8 5.8 5.8
Total demand current per phase 139.0 153.25 149.85

4. Using the highest loaded
phase (L2 at 153.25 A)
10% for future additions
= 1.1 x 153.25 = 168.575 A.