menu Log in Contact About Updates Prices FAQ Home

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.

maximum_demand_as3000_application_domestic_house

House, shed or individual living unit.

AS/NZS 3000, Table C1, Column 2.

Load Red
(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 - -

How can I improve this calculator?

Click here to let me know.

See Also

Contents

  1. Parameters
  2. How to calculate maximum demand?
  3. Maximum demand tables.
  4. Examples for domestic installations.

Parameters

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.

  1. Table C1 (column 2): Single domestic electrical installations.
  2. Table C1 (columns 3 to 5): Blocks of living units.
  3. Table C2 (columns 2 and 3): Non-domestic electrical installations.

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.

75% connected load
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.

50% connected load.
c) Laundry, appliance > 10A

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

50% connected load.
d) Air conditioner > 10A
d) Space heater > 10A
d) Sauna heater > 10A

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

75% connected load.
e) Hot water system, instantaneous

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

33.3% connected load.
f) Hot water system, storage

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

100% connected load.
g) Pool water heater
g) Spa water heater

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

Largest swimming pool, 75% connected load.
Largest spa, 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.

Largest motor, 100% connected load.
Remaining motors, 50% connected load.
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.

75% connected load.
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.

100% connected load
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
50% connected load
jii) Communal air conditioner > 10A
jii) Communal space heater > 10A
jii) Communal sauna heater
75% connected load
jiii) Communal pool heater
jiii) Communal spa heater
Largest swimming pool, 75% connected load.
Largest spa, 75% connected load.
Remaining water heaters, 25% connected load.
jiv) Communal electric vehicle charger
Connected load
100% 90% 75%
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.

Largest motor, 100% connected load.
Remaining motors, 50% connected load.
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).

75% of the connected load. 100% of the connected load.
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
Largest appliance, 100% connected load.
Remaining appliances, 50% connected load.
Largest appliance, 100% connected load.
Remaining appliances, 75% connected load.
cii) Electric vehicle charger
Largest charger, 100% connected load.
Remaining chargers, 75% connected load.
d) Motor, general

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

Largest motor, 100% connected load.
Remaining motors, 50% connected load.
Largest motor, 100% connected load.
Next largest motor, 75% connected load.
Remaining motors, 50% 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.
Remaining motors, 25% 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
100% connected load.
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.

  1. Single-phase, house, 3 bedrooms, 1 bathroom, 1 carport
  2. Single-phase, club-house with tennis court.
  3. Three-phase, house

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

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".

Load group Phase
/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.

Load group Phase
/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

Load group Phase
/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