# Maximum Demand Calculator with Examples AS/NZS 3000

Free online maximum demand calculator of electricity for Australia and New Zealand, according to AS/NZS 3000:2018. Includes formulas and examples.

House, shed or individual living unit.

AS/NZS 3000, Table C1, Column 2.

(A)
White
(A)
Blue
(A)
ai) Light, general
Internal and external lighting
5 - -
bi) Socket 10A, general use
Socket outlets 16 double point 10 A outlets
15 - -
c) Cooking, range > 10A
Cooking range 9kW (3kW oven, 1.8kW/1.2kW plates
20 - -
f) Hot water system, storage
Hot water system 3.6 kW
16 - -
d) Air conditioner > 10A
Living room AC, 5kW (cooling 11.5A max. input
9 - -
Total (A) 64 - -

## Parameters

• Application: Select your application as defined by AS/NZS 3000:2018.
• Load group: Select the load group from the drop-down menu. Each load group maps to a load group in AS/NZS 3000. The load groups are described in the maximum demand tables. You can use the same load group multiple times.
• Description: Describe the load. Maximum 48 characters.
• Phase: Select the phase supply for the load. For three-phase installations distribute single-phase loads evenly across the three phases. For single-phase installations choose one phase for all inputs, and ignore the other two phases.
• Rating: (A or W) The rating of each individual load in amperes or watts. When rated in watts, the current is calculated at 230 V for single-phase and 400 V for three-phase loads.
• Quantity: The number of loads per phase with the same rating. For example, if you have 10 lighting points on the same phase, enter 10. Or if you have 3 air conditioners with same rating on the same phase, enter 3.

## How to calculate maximum demand of electricity?

The maximum demand of electricity in Australia and New Zealand is calculated according to the maximum demand tables, Table C1 and Table C2, in the AS/NZS 3000:2018 standard.

## Maximum demand tables

The maximum demand tables are based on Table C1 and Table C2 in AS/NZS 3000:2018. I added a few specific load groups to simplify the calculator. I have also re-phrased the text. However, the formulas and the calculated results. The tables below should be read in conjunction with the standard, which includes additional information, and examples.

### Table C1 (column 2) for single domestic installations or individual living units per phase.

Load Group Single domestic installation or individual living unit per phase
ai) Light, general

Includes dedicated lighting socket outlets > 2.3m.
Includes exhaust fans ≤ 150 W, > 2.3m.
Lighting tracks = 2 points/m.

3 A for the first 20 points.
Plus 2 A for each additional 20 points, or any part of it.
aii) Lighting, outdoor > 1000W

Lighting track = 0.5 A/m.

bi) Socket 10A, general use
bi) Fixed connection ≤ 10A

Includes permanently connected electrical equipment ≤ 10 A and not included in other load groups.
Excludes permanently connected water heaters (e, f, g), lift motors (k), and general motors (l).

10 A for the first 20 points.
Plus 5 A for each additional 20 points, or any part of it.
bii) Socket 15A, general use

Excludes equipment for cooking (c), laundry (c), space heating (d), airconditioning (d), water heaters (e, f, g), lift motors (l), general motors (l), pool pump motors (l), other permanently connected appliances (m).

10 A for 1 or more sockets.
If there is a 20 A socket in the same phase, 15 A is used for both.
biii) Socket 20A, general use

Excludes equipment for: cooking (c), laundry (c), space heating (d), airconditioning (d), water heaters (e, f, g), lift motors (l), general motors (l), pool pump motors (l) and other permanently connected appliances (m).

15 A for 1 or more sockets.
If there is a 15 A socket in the same phase, 15 A is used for both.
c) Cooking, range > 10A
c) Cooking, other > 10A

Includes socket-connected ranges (stove with hotplates).
Includes anything that is used for for cooking.

c) Laundry, appliance > 10A

Includes socket-connected equipment.
For example, a washing machine or dryer.

d) Air conditioner > 10A
d) Space heater > 10A
d) Sauna heater > 10A

Includes air conditioning, space heating, and sauna heating.
Includes socket-connected equipment.

e) Hot water system, instantaneous

Includes socket-connected water heaters.
Includes quick recovery heaters > 100 W/litre.

f) Hot water system, storage

Includes socket-connected water heaters.
Includes quick recovery heaters ≤ 100 W/litre.

g) Pool water heater
g) Spa water heater

Incluses swimming pool and spa heaters.
Includes socket-connected heaters.

Largest swimming pool, 75% connected load.
Remaining water heaters, 25% connected load.
jiv) Electric vehicle charger 100% connected load
k) Motor, lift

Includes socket-connected lift motors.

Largest lift motor, 125% connected load.
Next largest lift motor, 75% connected load.
Remaining lift motors, 50% connected load.
l) Motor, general

Includes socket-connected general motors and socket-connected pool pumps.
Excludes lift motors.

m) Other appliances > 5A

Includes permanently connected appliances > 5A that are not covered by other load groups.
Ignore if the load is ≤ 5A.
Examples inlcude pottery kilns, welding machines or radio transmitters.

Self-assess the maximum demand.
Worse case, use the connected load.

### Table C1 (columns 3 to 5) for blocks of living units.

Load Group Blocks of living units
2 to 5 units per phase 6 to 20 units per phase 21 or more units per phase
ai) Unit light, general

Includes dedicated lighting socket outlets > 2.3m.
Includes exhaust fans ≤ 150 W, > 2.3m.
Lighting tracks = 2 points/m.
Outdoor unit lights are not considered for maximum demand.
For communal outdoor lights use use (h) Communical lights.

6A 5A + 0.25A per unit 0.5A per unit
bi) Unit socket 10A, general use

Includes permanently connected electrical equipment ≤ 10A that are not included in other load groups.
Excludes equipment connected with sockets in load groups (e), (f), (g), and (l).

10A + 5A per unit 15A + 3.75A per unit 50A + 1.9A per unit
c) Unit cooking, range > 10A
c) Unit cooking, other > 10A

Includes socket-connected ranges (stove with hotplates).
Includes anything used for cooking.

15A 2.8A per unit
c) Unit laundry appliance > 10A

Includes socket-connected equipment.
For example, a washing machine or dryer.

15A 2.8A per unit
d) Unit air conditioner > 10A
d) Unit space heater > 10A

Includes socket-connected equipment.

e) Unit hot water system, instantaneous.

Includes socket-connected water heaters.
Includes quick recovery heaters > 100 W/litre.

6A per unit 100A + 0.8A per unit
f) Unit hot water system, storage

Includes socket-connected water heaters.
Includes quick recovery heaters ≤ 100 W/litre.

6A per unit 100A + 0.8A per unit
h) Communal light, general

Includes dedicated lighting socket outlets higher than 2.3 m.
Lighting track = 2 points/m.

i) Communal socket 10A, general use
i) Communal fixed connection ≤ 10A

Excludes equipment connected with sockets in load groups (j) and (m).
Includes permanently connected electrical equipment ≤ 10A.

2A per point, up to a maximum of 15A
bii) Communal socket 15A, general use

Excludes equipment connected with sockets in load groups (c), (d), (e), (f), (g), (l) and (m).

10A for 1 or more sockets.
If there is a 20A socket in the same phase, 15A is used for both.
biii) Communal socket 20A, general use

Excludes equipment connected with sockets in load groups (c), (d), (e), (f), (g), (l) and (m).

15A for 1 or more sockets.
If there is a 15A socket in the same phase, 15A is used for both.
ji) Communal hot water system, instantaneous
ji) Communal hot water system, storage
ji) Communal cooking, range > 10A
ji) Communal cooking, other > 10A
ji) Communal laundry, appliance > 10A
jii) Communal air conditioner > 10A
jii) Communal space heater > 10A
jii) Communal sauna heater
jiii) Communal pool heater
jiii) Communal spa heater
Largest swimming pool, 75% connected load.
Remaining water heaters, 25% connected load.
jiv) Communal electric vehicle charger
k) Communal motor, lift

Includes socket-connected lift motors.

Largest lift motor, 125% connected load.
Next largest lift motor, 75% connected load.
Remaining lift motors, 50% connected load.
l) Communal motor, general

Includes socket-connected general motors.
Excludes lift motors.

m) Other, appliances > 10A

Includes permanently connected appliances > 10A that are not covered by other load groups.
Ignore if the load is ≤ 10A.
Examples inlcude pottery kilns, welding machines or radio transmitters.

Self-assess the maximum demand.
Worse case, use the connected load.

### Table C2 (columns 2 and 3) for non-domestic installations.

Load Group Residential institutions, hotels, boarding houses, hospitals, accommodation houses and motels. Factories, shops, stores, offices, business premises, schools and churches.
a) Lighting, general

Includes indoor and outdoor lighting.
Includes dedicated lighting socket outlets > 2.3m.
Includes exhaust fans ≤ 150 W, > 2.3m.
Lighting tracks = the greater of 0.5 A/m or the connected load.
Excludes fuel dispensing lights (f).

bi) Socket 10A, general, no HVAC room

jCalc caluclations are based on 230Vac.

1,000 W for the first outlet.
400 W for each additional outlet.
1,000 W for the first outlet.
750 W for each additional outlet.
bii) Socket 10A, general, in HVAC room.

jCalc caluclations are based on 230Vac.

1,000 W for the first outlet
100 W for each additional outlet
biii) Socket 15A, general use
biii) Socket 20A, general use
biii) Socket 32A, general use
biii) Socket 40A, general use
biii) Socket 50A, general use
biii) Socket 63A, general use
biii) Socket 80A, general use
biii) Socket 100A, general use
biii) Socket 125A, general use
Largest socket, 100% rating.
Remaining sockets, 50% rating.
Largest socket, 100% rating.
Remaining sockets, 75% rating.
ci) Cooking, range
ci) Cooking, other
ci) Air conditioner
ci) Hot water system, instantaneous
cii) Electric vehicle charger
d) Motor, general

Exlcudes lift motors (e) and fuel dispensing motors (f).

Next largest motor, 75% connected load.
e) Motor, lift
Largest lift motor, 125% connected load.
Next largest lift motor, 75% connected load.
Remaining lift motors, 50% connected load.
fi) Fuel dispensing motor Largest motor, 100% connected load.
Next largest motor, 50% connected load.
fii) Fuel dispensing lights 100% connected load.
g) Hot water system, storage
g) Storage heater, general
g) Space heater
g) Pool heater
g) Spa heater
g) Sauna heater
hi) Welder, arc Two largest welders, 100% of rated primary current.
Next largest welder, 85% of rated primary current.
Next largest welder, 70% of rated primary current.
Remaining welders, 60% of rated primary current.
hii) Welder, resistance, auto, varied duty 70% of rated primary current.
hii) Welder, resistance, manual, varied duty 50% of rated primary current.
hii) Welder, resistance, specific duty
Duty Rated primary current
50% 71%
40% 63%
30% 55%
25% 50%
20% 45%
15% 39%
10% 32%
7.5% 27%
≤5.0% 22%
i) X-ray equipment 100% connected load.
j) Other equipment

Equipment not covered by other load groups.

Self-assess the maximum demand.
Worse case, use the connected load.

## Maximum demand examples for single domestic installations.

The examples below are not the same examples as the examples in the standard.

### Domestic example 1: Single-phase, house, 3 bedrooms, 1 bathroom, 1 carport.

• 25 General lighting points. Including outdoor lights.
• 22 Socket outlets (10A ), i.e. 11 double socket arrangements.
• 1 Cooking range (Stove), 6.9 kW at 230 V.
• 1 Ducted air conditioner. 10 kW cooling and 11.2 kW heating. Maximum current 20A.

Note that the current for the air conditioner is from the manufacturer's specification. It is not calculated from the cooling or heating kilowatt rating, because a reverse cycle air conditioner uses less electricity relative to the cooling or heating power.

Also note that laundry equipment is not listed separately here. They are included in "bi) Socket-outlet, general use ≤ 10A".

/Rating
Quantity Demand
ai) Lighting, general

3A + 2A

1 Ph
n/a
25 5
bi) Socket-outlet, general use ≤ 10A

10A + 5A

1 Ph
n/a
22 15
c) Cooking Range (Stove) > 10A

6900W ÷ 230V × 0.5

1 Ph
6900W
1 15
d) HVAC, Airconditioning > 10A

20A × 0.75

1 Ph
20A
1 15
Total 50 A

### Domestic example 2: Single-phase, club-house with tennis court.

• 24 General lighting points. Excluding tennis court lights.
• 10 Meter lighting track.
• 9 Single socket outlets (10A).
• 8 Double socket outlets (10A).
• 1 Single socket outlet (15A)
• 1 50 W exhaust fan.
• 1 1000 W strip heater.
• 1 Cooking range (Stove), 10 kW at 230 V.
• 1 Water heater, 4.8 kW at 230 V.
• 1 Tennis court lighting, 3kW
/Rating
Quantity Demand
ai) Lighting, general

24 Lights, plus 10 points for the lighting track at 2 points/meter, plus 1 exhaust fan (≤ 150W).
3A + 2A + 2A

1 Ph
n/a
45 points 7A
aii) Lighting, outdoor > 1000W

3000W ÷ 230V × 0.75

1 Ph
3000W
1 10A
bi) Socket-outlet, general use ≤ 10A

10A + 5A

1 Ph
n/a
25 15A
bii) Socket-outlet, general use ≤ 15A 1 Ph
n/a
1 10A
c) Cooking Range (Stove) > 10A

10000W ÷ 230V × 0.5

1 Ph
10000W
1 22A
f) Water heater, storage

4800W ÷ 230V × 1.0

1 Ph
4800W
1 21A
Total 85A

### Domestic example 3: Three-phase, house

• 25 General lighting points.
• 20 Double socket outlets (10A).
• 2 Single socket outlet (15A)
• One 15 kW 3-phase range. With 7 kW oven, and two 4 kW hotplates.
• One 7.5 kW Single-phase split unit air conditioner, with a maximum current of 15A.
• One 12 kW 3-phase instantaneous water heater.
• One 3.8 kW single-phase laundry dryer connected to its own dedicated 20A socket.
/Rating
Quantity Demand
(A)
R W B R W B
ai) Lighting, general

3A + 2A

1 Ph
n/a
25 5
bi) Socket-outlet, general use ≤ 10A 1 Ph
n/a
10 10 10 10
bii) Socket-outlet, general use ≤ 15A 1 Ph
n/a
2 10
c) Cooking Range > 10A

Oven 7000W ÷ 230V × 0.5

1 Ph
7kW
1 15
c) Cooking Range > 10A

Hotplates 4000W ÷ 230V × 0.5

1 Ph
4kW
1 1 9 9
c) Laundry, dryer > 10A

16A × 0.5

1 Ph
16A
1 8
d) HVAC, Airconditioning > 10A

15A × 0.75

1 Ph
15A
1 11
e) Water heater, instantaneous

12000W ÷ 400 ÷ √3 × 0.33

3 Ph
12kW
1 1 1 6 6 6
Total (A) 36 36 33