Maximum Demand Calculator with Examples AS/NZS 3000

Q: How to calculate maximum demand of electricity?

The maximum demand of electricity in Australia and New Zealand is calculated according to Tables C1 and C2 in AS/NZS 3000. Click here to try.

Q: How to calculate maximum demand in Australia?

The maximum demand of electricity in Australia and New Zealand is calculated according to Tables C1 and C2 in AS/NZS 3000. Click here to try.

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

Application (click to change)

maximum_demand_as3000_application_domestic_house

House, shed or individual living unit.

AS/NZS 3000, Table C1, Column 2.

Quantity Rating Demand (A) Load group Description Phase Red White Blue (per load) Red White Blue

Load group ai) Light, general Description Internal and external lighting Phase 1 Ph Lights per phase.

+ -

40x 0x 0x Demand (A) Red White Blue 5.0 0.0 0.0

Load group bi) Socket 10A, general use Description Socket outlets 16 double point 10A outlets Phase 1 Ph Sockets per phase.

+ -

32x 0x 0x Demand (A) Red White Blue 15.0 0.0 0.0

Load group c) Cooking, range > 10A Description Cooking range 9kW (3kW oven, 1.8kW/1.2kW plates) Phase Rating

+ -

1 Ph, 9 kW Loads per phase.

+ -

1x 0x 0x Demand (A) Red White Blue 19.6 0.0 0.0

Load group f) Hot water system, storage Description Hot water system 3.6kW Phase Rating

+ -

1 Ph, 3.6 kW Loads per phase.

+ -

1x 0x 0x Demand (A) Red White Blue 15.7 0.0 0.0

Load group d) Air conditioner > 10A Description Living room AC, 5kW, max input 11.5A Phase Rating

+ -

1 Ph, 11.5 A Aircons per phase.

+ -

1x 0x 0x Demand (A) Red White Blue 8.6 0.0 0.0

Maximum demand total (A) 64 0 0

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Parameters

Application: Select your application as defined by AS/NZS 3000:2018.
- House, shed or individual living unit. Table C1, column 2.
- Blocks of living units. Table C2, columns 3 to 5.
- Residential institutions, hotels, boarding houses, hospitals, accommodation houses and motels. Table C2, column 2.
- Factories, shops, stores, offices, business premises, schools and churches. Table C2, column 3.
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, W or kW) The rating of each individual load in amperes, watts or kilowatts. When rated in watts or kilowatts, the current is calculated at 230 V for single-phase and 400 V for three-phase loads. The power factor and efficiency for motors is assumed to be 0.86 and 0.95. For all other loads, the power factor and efficiency is 1.
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 the same rating on the same phase, enter 3.

How to calculate the maximum demand of an electrical installation?

The maximum demand of an electrical installation 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): Single domestic electrical installations.
Table C1 (columns 3 to 5): Blocks of living units.
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 (ai) Exhaust fan ≤ 150W (ai) Ceiling fan ≤ 150W Includes dedicated lighting socket outlets higher than 2.3m. Includes exhaust and ceiling fans ≤ 150W. Lighting tracks = 2 points/m.	3A for the first 20 points. Plus 2A for each additional 20 points, or any part of it.
(aii) Lighting, outdoor > 1000W Includes flood lights, swimming pool lights and tennis court lights. Outdoor lights ≤ 1000W can be included in (ai) Light, general. Outdoor lights ≤ 1000W included here will be calculated as 75% connected load. Lighting tracks = 0.5 A/m per phase.	75% connected load
(bi) Socket 10A, general use (bi) Fixed connection ≤ 10A Double socket = 2 sockets. Includes fixed-connected equipment ≤ 10A. Excludes fixed- or socket-connected equipment in load groups: (e) Hot water system, instantaneous (f) Hot water system, storage (g) Pool water heater (g) Spa water heater (k) Motor, lift (l) Motor, general	10A for the first 20 points. Plus 5A for each additional 20 points, or any part of it.
(bii) Socket 15A, general use Excludes socket-connected equipment in load groups: (c) Cooking, range > 10A (c) Cooking, other > 10A (c) Laundry, appliance > 10A (d) Air conditioner > 10A (d) Space heater > 10A (d) Sauna heater > 10A (e) Hot water system, instantaneous (f) Hot water system, storage (g) Pool water heater (g) Spa water heater (jiv) Electric vehicle charger (k) Motor, lift (l) Motor, general (m) Other appliances > 5A	10A for 1 or more sockets. If there is a 20A socket in the same phase, 15A is used for both.
(biii) Socket 20A, general use Excludes socket-connected equipment in load groups: (c) Cooking, range > 10A (c) Cooking, other > 10A (c) Laundry, appliance > 10A (d) Air conditioner > 10A (d) Space heater > 10A (d) Sauna heater > 10A (e) Hot water system, instantaneous (f) Hot water system, storage (g) Pool water heater (g) Spa water heater (jiv) Electric vehicle charger (k) Motor, lift (l) Motor, general (m) Other appliances > 5A	15A for 1 or more sockets. If there is a 15A socket in the same phase, 15A is used for both.
(c) Cooking, range > 10A (c) Cooking, other > 10A (c) Laundry, appliance > 10A Includes stoves, ovens, hot plates, washing machines or dryers. Includes fixed- and socket-connected appliances > 10A. Appliances ≤ 10A are included in: (bi) Socket 10A, general use (bi) Fixed connection ≤ 10A Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.	50% connected load.
(d) Air conditioner > 10A (d) Space heater > 10A (d) Sauna heater > 10A Includes fixed- and socket-connected appliances > 10A. Appliances ≤ 10A are included in: (bi) Socket 10A, general use (bi) Fixed connected ≤ 10A Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.	75% connected load.
(e) Hot water system, instantaneous Includes fixed- and socket-connected appliances with any rating. Includes quick recovery heaters > 100 W/litre. Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.	33.3% connected load.
(f) Hot water system, storage Includes fixed- and socket-connected appliances with any rating. Includes quick recovery heaters ≤ 100 W/litre. Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.	100% connected load.
(g) Pool water heater (g) Spa water heater Includes fixed- and socket-connected appliances with any rating. Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.	Largest pool heater, 75% connected load. Largest spa heater, 75% connected load. Remaining water heaters, 25% connected load.
(jiv) Electric vehicle charger > 10A Includes fixed- and socket-connected electric vehicle chargers. Chargers ≤ 10A are included in (bi) Socket 10A, general use. Chargers rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.	100% connected load
(k) Motor, lift Includes fixed- and socket-connected lift motors with any rating. Motors rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V, pf = 0.86, and efficiency = 0.95.	Largest lift motor, 125% connected load. Next largest lift motor, 75% connected load. Remaining lift motors, 50% connected load.
(l) Motor, general Includes fixed- and socket-connected motors with any rating. Excludes lift motors. Motors rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V, pf = 0.86, and efficiency = 0.95.	Largest motor, 100% connected load. Remaining motors, 50% connected load.
(m) Other appliances > 5A Includes fixed-connected appliances > 5A that are not covered by other load groups. Demand is ignored for loads ≤ 5A. Examples include pottery kilns, welding machines and radio transmitters.	Self-assess the maximum demand. Worst case, use the connected load.

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

Load Group

Living units per phase

2 to 5 units

6 to 20 units

21+ units

(ai) Unit light, general

Demand estimated from number of living units. Number of lighting points or rating not required.
Includes dedicated lighting socket outlets higher than 2.3m.
Includes exhaust and ceiling fans ≤ 150W.
Includes lighting tracks. Points per meter not required.
Outdoor unit lights are not considered for maximum demand.
For communal outdoor lights use (h) Communal lights.
Enter 3-phase living units as single-phase. For example, 8 units: red=3, white=3, blue=2. Click for an example.

5A + 0.25A per unit

0.5A per unit

(bi) Unit socket 10A, general use

Demand estimated from number of living units. Number of sockets not required.
Double socket = 2 sockets.
Includes fixed-connected equipment ≤ 10A.
Excludes fixed- and socket-connected equipment in load groups:
- (e) Unit hot water system, instantaneous
- (f) Unit hot water system, storage
Enter 3-phase living units as single-phase. For example, 8 units: red=3, white=3, blue=2. Click for an example.

10A + 5A per unit

15A + 3.75A per unit

50A + 1.9A per unit

Demand estimated from number of living units. Number of appliances or rating not required.
Includes stoves, ovens, hot plates, washing machines or dryers.
Includes fixed- and socket-connected appliances > 10A.
Appliances ≤ 10A are included in (bi) Unit socket 10A, general use.
Enter 3-phase living units as single-phase. For example, 8 units: red=3, white=3, blue=2. Click for an example.

15A

2.8A per unit

(d) Unit air conditioner > 10A
(d) Unit space heater > 10A

Demand estimated from rating and quantity of appliances, not number of living units.
Includes fixed- and socket-connected appliances > 10A.
Appliances ≤ 10A are included in (bi) Unit socket 10A, general use.

75% connected load.

(e) Unit hot water system, instantaneous.

Demand estimated from number of living units. Number of appliances or rating not required.
Includes fixed- and socket-connected appliances with any rating.
Includes quick recovery heaters > 100 W/litre.
Enter 3-phase living units as single-phase. For example, 8 units: red=3, white=3, blue=2. Click for an example.

6A per unit

100A + 0.8A per unit

(f) Unit hot water system, storage

Demand estimated from number of living units. Number of appliances or rating not required.
Includes fixed- and socket-connected appliances with any rating.
Includes quick recovery heaters ≤ 100 W/litre.
Enter 3-phase living units as single-phase. For example, 8 units: red=3, white=3, blue=2. Click for an example.

6A per unit

100A + 0.8A per unit

(h) Communal light, general
(h) Communal exhaust fan ≤ 150W
(h) Communal ceiling fan ≤ 150W

Includes dedicated lighting socket outlets higher than 2.3m.
Includes exhaust and ceiling fans ≤ 150W.
Lighting tracks = 0.5 A/m per phase, or connected load, whichever is greater.

100% connected load

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

Double socket = 2 sockets.
Includes fixed-connected equipment ≤ 10A.
Excludes fixed- or socket-connected equipment in load groups:
- (k) Communal motor, lift
- (l) Communal motor, general

2A per point, up to a maximum of 15A

(bii) Communal socket 15A, general use

Excludes socket-connected equipment in load groups:
- (ji) Communal hot water system, instantaneous > 10A
- (ji) Communal hot water system, storage > 10A
- (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 > 10A
- (jiii) Communal pool heater > 10A
- (jiii) Communal spa heater > 10A
- (jiv) Communal electric vehicle charger.
- (k) Communal motor, lift
- (l) Communal motor, general

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 socket-connected equipment in load groups:
- (ji) Communal hot water system, instantaneous > 10A
- (ji) Communal hot water system, storage > 10A
- (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 > 10A
- (jiii) Communal pool heater > 10A
- (jiii) Communal spa heater > 10A
- (jiv) Communal electric vehicle charger.
- (k) Communal motor, lift
- (l) Communal motor, general

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 > 10A
(ji) Communal hot water system, storage > 10A
(ji) Communal cooking, range > 10A
(ji) Communal cooking, other > 10A
(ji) Communal laundry, appliance > 10A

Includes fixed- and socket-connected appliances > 10A.
Appliances ≤ 10A are included in (i) Communal socket 10A, general use.
Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

50% connected load

(jii) Communal air conditioner > 10A
(jii) Communal space heater > 10A
(jii) Communal sauna heater > 10A

Includes fixed- and socket-connected appliances > 10A.
Appliances ≤ 10A are included in (i) Communal socket 10A, general use.
Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

75% connected load

(jiii) Communal pool heater > 10A
(jiii) Communal spa heater > 10A

Includes fixed- and socket-connected appliances > 10A.
Appliances ≤ 10A are included in (i) Communal socket 10A, general use.
Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

Largest pool heater, 75% connected load.
Largest spa heater, 75% connected load.
Remaining water heaters, 25% connected load.

(jiv) Communal electric vehicle charger > 10A

Includes fixed- and socket-connected electric vehicle chargers.
Chargers ≤ 10A are included in (i) Communal socket 10A, general use.
Chargers rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

Connected load
100%	90%	75%

(k) Communal motor, lift

Includes fixed- and socket-connected lift motors with any rating.
Motors rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V, pf = 0.86, and efficiency = 0.95.

Largest lift motor, 125% connected load.
Next largest lift motor, 75% connected load.
Remaining lift motors, 50% connected load.

(l) Communal motor, general

Includes fixed- and socket-connected motors with any rating.
Excludes lift motors.
Motors rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V, pf = 0.86, and efficiency = 0.95.

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

(m) Other appliances > 10A

Includes fixed-connected appliances > 10A that are not covered by other load groups.
Demand is ignored for loads ≤ 10A.
Examples include pottery kilns, welding machines and radio transmitters.

Self-assess the maximum demand.
Worst case, use the connected load.
Demand for loads ≤ 10A is zero.

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
(a) Exhaust fan ≤ 150W
(a) Ceiling fan ≤ 150W

Includes indoor and outdoor lighting.
Includes dedicated lighting socket outlets higher than 2.3m.
Includes exhaust and ceiling fans ≤ 150W.
Lighting tracks = 0.5 A/m per phase, or connected load, whichever is greater.
Excludes (f) Fuel dispensing lights.

75% of the connected load.

100% of the connected load.

(bi) Socket 10A, general, no HVAC room

In rooms without permanent heating or cooling, where portable heating or cooling equipment is required.
Excludes sockets in HVAC rooms, i.e. (bii) Socket 10A, general, in HVAC room.
Double socket = 2 sockets.
Demand calculation based on 1Ph = 230V and pf = 1.

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

In rooms with permanent heating or cooling, where portable heating or cooling equipment is unnecessary.
Double socket = 2 sockets.
Demand calculation based on 1Ph = 230V and pf = 1.

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

Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

Largest appliance, 100% connected load.
Remaining appliances, 50% connected load.

Largest appliance, 100% connected load.
Remaining appliances, 75% connected load.

(cii) Electric vehicle charger

Chargers rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

Largest charger, 100% connected load.
Remaining chargers, 75% connected load.

(d) Motor, general

Excludes:
- (e) Motor, lift
- (f) Fuel dispensing motor
Motors rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V, pf = 1 and efficiency = 0.95.

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

Excludes:
- (d) Motor, general
- (f) Fuel dispensing motor
Motors rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V, pf = 1 and efficiency = 0.95.

Largest lift motor, 125% connected load.
Next largest lift motor, 75% connected load.
Remaining lift motors, 50% connected load.

(fi) Fuel dispensing motor

Excludes:
- (d) Motor, general
- (e) Motor, lift
Motors rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V, pf = 1 and efficiency = 0.95.

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

Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

100% connected load.

(h) Welder, arc
(h) Welder, resistance, auto, varied duty
(h) Welder, resistance, manual, varied duty
(h) Welder, resistance, specific duty

Resistance welders include spot, seam, projection and butt welders.
Appliances rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

Arc welders

Two largest arc welders, 100% of rated primary current.
Next largest arc welder, 85% of rated primary current.
Next largest arc welder, 70% of rated primary current.
Remaining arc welders, 60% of rated primary current.

Resistance welders

Duty	Percentage of rated primary current
Varied duty
Auto	70%
Manual	50%
Specific duty
50%	71%
40%	63%
30%	55%
25%	50%
20%	45%
15%	39%
10%	32%
7.5%	27%
≤ 5.0%	22%

Groups of resistance welders

Largest resistance welder = 100% of calculated demand.
Remaining resistance welders = 60% of calculated demand.

(i) X-ray equipment

Equipment rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

100% connected load.

(j) Other equipment

Equipment not covered by other load groups.
Equipment rated in watts or kilowatts: 1Ph = 230V, 3Ph = 400V and pf = 1.

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

Maximum demand example for a house (single-phase)

Loads

24 x General lighting points, excluding tennis court lights.
1 x Lighting track, 10m.
1 x Exhaust fan, 50 W.
1 x Tennis court lighting, 3 kW
9 x Single socket outlets, 10A.
8 x Double socket outlets, 10A.
1 x Single socket outlet, 15A.
1 x Spaced heater, 1.8 kW, fixed connection.
1 x Space heater, 2.5 kW, fixed connection.
2 x Air conditioner, 2.5 kW, max. input 6 A, fixed connection.
1 x Air conditioner, 5 kW , max. input 11.5 A, fixed connection.
1 x Cooking range, 10 kW.
1 x Storage water heater, 4.8 kW.

Maximum demand calculation

The load 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.
Laundry appliances included in (bi) Socket-outlet, general use ≤ 10A.

Load group	Phase Rating	Qty	Demand (A)
(ai) Lighting, general 24 x General lighting points. 3A (first 20 points) + 2A (next 20 points).	1 Ph	24	5
(ai) Lighting, general 1 x Lighting track, 10m, 2 points per meter. +2A (next 20 points).	1 Ph	20	2
(ai) Exhaust fan ≤ 150W 1 x Exhaust fan, 50W. Included in load group (ai), because its ≤ 150W. +0A, already condsidered in previous lines.	1 Ph	1	0
(aii) Lighting, outdoor > 1000W 1 x Tennis court lighting, 3 kW. 3000W ÷ 230V × 0.75 = 9.8 A.	1 Ph 3 kW	1	9.8
(bi) Socket-outlet, general use ≤ 10A 9 x Single sockets, 10A, general use. +5A (next 10 points).	1 Ph	9	10
(bii) Socket-outlet, general use ≤ 10A 8 x Double socket outlets, 10A, general use. +5A (next 10 points).	1 Ph	16	5
(bii) Socket-outlet, general use ≤ 15A 1 x Single socket outlet, 15A, general use. 10A for 1 or more sockets.	1 Ph	1	10
(bi) Fixed connection ≤ 10A 1 x Space heater, 1.8 kW, fixed connection. Included in load group (bi), because its ≤ 10A. +0A. Already condsidered in previous lines.	1 Ph 1.8 kW	1	0
(d) Space heater > 10A 1 x Space heater, 2.5 kW, fixed connection. 2500 ÷ 230 × 0.75 = 8.2A.	1 Ph 2.5 kW	1	8.2
(bi) Fixed connection ≤ 10A 2 x Air conditioner, 2.5 kW, max. input 6A, fixed connection. Included in load group (bi), because its ≤ 10A. +0A. Already condsidered in previous lines.	1 Ph 1.8 kW	2	0
(d) Air conditioner > 10A 1 x Air conditioner, 5 kW, max. input 11.5 A, fixed connection. 11.5 × 0.75 = 8.6 A.	1 Ph 11.5 A	1	8.6 A
(c) Cooking Range (Stove) > 10A 1 x Cooking range, 10 kW 10,000 ÷ 230V × 0.5 = 21.7 A	1 Ph 10 kW	1	21.7
(f) Water heater, storage 1 x Storage water heater, 4.8 kW. 4800 ÷ 230V × 1.0 = 20.9 A.	1 Ph 4.8 kW	1	20.9
Total (A)			99

Maximum demand example for living units (3-phase)

Loads for three-phase living units

Load	Number of living units
Lighting (including exhaust and ceiling fans).	8
Double sockets, 10A.	8
Single-phase electric ranges.	8
Single-phase storage water heaters, 4.8 kW.	8
Single-phase air conditioners, 5 kW, max. input 11.5 A, fixed connection.	8

Communal loads

Load	Number of loads
Lights, 60W.	20
Exhaust fans, 50W.	4
Double sockets, 10A.	5
Pool pump motor, 3-phase, 3 kW.	1

Maximum demand calculation

Enter 3-phase living units as single-phase living units -consitent with Example 3 in AS/NZS 3008.
The calculation assumes that the installation is reasonably balanced.
Distribute large single-phase loads across phases. For example, water heaters.

Load group	Phase	Qty			Demand (A)
Load group	Rating	R	W	B	R	W	B
(ai) Unit light, general Demand estimated from number of living units. Number of lighting points or rating not required. Includes exhaust and ceiling fans ≤ 150W. Enter 3-phase living units as single-phase living units. 6A for 2 to 5 living units.	1 Ph	3	3	2	6	6	6
(bi)Unit socket 10A, general use Demand estimated from number of living units. Number of lighting sockets not required. Enter 3-phase living units as single-phase living units. 10A + 5A per living unit.	1 Ph	3	3	2	25	25	20
(c) Unit cooking range > 10A Demand estimated from number of living units. Number of loads or rating not required. Enter 3-phase living units as single-phase living units. 15A for 2 to 5 living units.	1 Ph	3	2	3	15	15	15
(f) Unit hot water system, storage Demand estimated from number of living units. Number of loads or rating not required. Enter 3-phase living units as single-phase living units. 6A per living unit.	1 Ph	3	2	3	18	12	18
(d) Unit air conditioner > 10A Demand estimated from rating and number of appliances, not number of living units. Air conditioner, single-phase, 5 kW, max. input 11.5 A, fixed connection. 75% connected load for 2 to 5 living units. 11.5A × 75% × 2 = 17.3 A.	1 Ph 11.5 A	2	3	3	17.3	25.9	25.9
(h) Communal light, general Demand estimated from rating and number of lights. 100% connected load. 1Ph = 230V, pf = 1. 10 x 60W ÷ 230V × 100% = 2.6A.	1 Ph 60 W	10	5	5	2.6	1.3	1.3
(h) Communal exhaust fan ≤ 150W Demand estimated from rating and number of fans. 100% connected load. 1Ph = 230V, pf = 1. 2 x 50W ÷ 230V × 100%= 0.4A.	1 Ph 50 W	0	2	2	0	0.4	0.4
(i) Communal socket 10A, general use Demand estimated from number of sockets. Double socket = 2 sockets. 2A per point, up to a maximum of 15A.	1 Ph	3	2	0	12	8	0
(l) Communal motor, general Pool pump motor, 3-phase, 3kW. Largest motor, 100% connected load. 3Ph = 400V, pf = 0.86, and efficiency = 0.95 3 × 1000 ÷ (400 × √3 × 0.86 × 0.95) × 100% = 8.6 A.	3 Ph 3 kW	1	1	1	5.3	5.3	5.3
Total (A)					101	99	92

Maximum Demand Calculator with Examples AS/NZS 3000

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Contents

Parameters

How to calculate the maximum demand of an electrical installation?

Maximum demand tables

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

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

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

Maximum demand example for a house (single-phase)

Loads

Maximum demand calculation

Maximum demand example for living units (3-phase)

Loads for three-phase living units

Communal loads

Maximum demand calculation