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**ELECTRICAL INSTALLATION PLANNING**

LSEGG307A 9080F

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Lesson Content Describe the acceptable methods for determining the maximum demand on an installation’s consumer’s mains. Calculate the maximum demand for the consumer's mains for given installations up to 400 A per phase.

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**Maximum Demand Non-Domestic**

Load are generally heavier Stay on for longer periods of time Heating & cooling has an effect on load

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**Residential Instillations**

Hotels Boarding Houses Hospitals Motels etc AS/NZS 3000 Table C2 Colum 2

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**Residential Instillations**

Lighting AS/NZS 3000 Table C2 Colum 2 Load group A 75% connected load Note B Incandescent Lamps = 60W Unless the fitting restricts the wattage to less Track lights = 0.5A/m

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**Residential Installations**

10A Power Points Load group B If this section of building DOES NOT HAVE fixed heating/cooling Load Group Bi 20 Double power points 72.2A 20 x 2 = 40 Points 1000W + (39 x 400W) = 16600230 = First Point Balance

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**Residential Installations**

10A Power Points Load group B If this section of building DOES NOT HAVE fixed heating/cooling HAS Load Group Bii Load Group Bi 20 Double power points 21.3A 72.2A 20 x 2 = 40 Points 1000W + (39 x 100W) = 1000W + (39 x 400W) = 16600230 = 4900230 = First Point Balance

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**Residential Installations**

Power Points Larger than 10A Load group Biii 1st = full current of highest 2nd = 50% x full current 3rd = 50% x full current 2 x 20A power points 2 x 15A power points 20A 0.5 x 20 = 10A 0.5 x 15A = 7.5A 45A

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**Residential Installations**

Power Points 3 Outlets Load Group B 10A 3 Outlet A B C 1 Point 1 Point 1 Point

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**An air conditioned motel consists of the following:**

Exercise 1 An air conditioned motel consists of the following: A Bii Biii A B C 30 x Light points 40 x Lights 6 x 400W mercury vapour flood lights 15 x Double power points (p/p) 10 x Single p/p & 15 x Double p/p 3 x 15A Single p/p 1 x 10A 3 outlet ((30x60)230)x0.75 = 5.87A 17.4A ((40x60)230)x0.75 = 7.83A 21.7A ((6x400)230)x0.75 = 7.83A 34.3A 31P (1000+(30x100))230 = 11+30P (1000+(40x100))230 = (1000230)+15+((2x15)x0.5) = 23.3A 29.5A 42.1A NSW S&IR Clause Less than 25A difference

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Factories Shops Offices Schools Churches AS/NZS 3000 Table C2 Colum 3

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**Factories Lighting Note B AS/NZS 3000 Table C2 Colum 3 Load group A**

100% connected load Note B Incandescent Lamps = 60W Unless the fitting restricts the wattage to less Track lights = 0.5A/m

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**Factories 10A Power Points Load Group Bi AS/NZS 3000 2.2.2.**

Calculation Assessment Measurement Limitation Load group B If this section of building DOES NOT HAVE fixed heating/cooling Load Group Bi 20 Double power points 131.5A 20 x 2 = 40 Points 1000W + (39 x 750W) = 30250230 = First Point Balance

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**Factories 10A Power Points Load Group Bii Load Group Bi Load group B**

If this section of building DOES NOT HAVE fixed heating/cooling HAS Load Group Bii Load Group Bi 20 Double power points 21.3A 131.5A 20 x 2 = 40 Points 1000W + (39 x 100W) = 1000W + (39 x 750W) = 30250230 = 4900230 = First Point Balance

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**Factories Power Points Larger than 10A Load group Biii**

1st = full current of highest 2nd = 75% x full current 3rd = 75% x full current 2 x 20A power points 2 x 15A power points 20A 0.75 x 20 = 15A 0.75 x 15A = 11.25A 57.5A

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**Only 2 welders on each phase**

AS/NZS 3000 C (b) 3 x 20A 3 Welders Majority of welders only use 2 phases B A C Only 2 welders on each phase W 1 W 2 W 3 20A + 20A = 40 Amps Per Phase

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**C3 Commercial & Light industrial**

Used to give a “Ball Park” figure of maximum demand when actual loads are not available in the initial design stages Values are given in VA per m2 of floor area

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**C3 Commercial & Light industrial**

10 metre x 10 metre air conditioned shop 10 x 10 = 100 m2 From C3 Light & power (average value)= 70 VA/m2 Air conditioning= 30 VA/m2 100 VA/m2 100 m2 x 100 VA/m2 = 10kVA = 14.4A / 400 x √3

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**Maximum Demand Final Sub-circuits Single items on circuit**

Multiple items on circuit Diversity may be applied Current rating of appliance Limit by circuit breaker Welders Domestic cooking appliances

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**Welding Machines Types Arc Welding Machines Stick MIG TIG Highest**

1st Machine 2nd 3rd 4th 5th + more 100% 85% 70% 60% Lowest Rated Primary Current Actual Primary Current

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**Welding Machines Types Arc Welding Machines Stick MIG TIG**

Resistance Welding Machines Stick MIG TIG Spot welders Rated Primary Current Actual Primary current Duty Cycle

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**Resistance Welding Machines**

Individual Machines Variable Operation Specific (fixed) Operation Seam welders Auto feed welders Manual welders Non-Auto Welders 70% 50% x Rated Primary Current Actual Primary current x Multiplier

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**Duty Cycle Ratio of ON TIME/OFF TIME in 1 minute 30/30 =**

Very few welders operate at 100% all of the time Changing the electrodes Repositioning the job Starting a new job Ratio of ON TIME/OFF TIME in 1 minute Weld for 30 seconds Off for 30 seconds 30/30 = 50% Duty Cycle

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**Resistance Welding Machines**

Individual Machines Groups of machines Variable Operation Specific (fixed) Operation Seam welders Auto feed welders Manual welders Non-Auto Welders 70% 50% x Rated Primary Current Actual Primary current x Multiplier Highest 1st Machine 2nd + More 100% 60% Lowest

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**Domestic Cooking Appliances**

Table C4 4.8kW wall oven = 6.8kW wall oven = 9kW wall oven + 4.8kW hotplate = 16A 20A 13.8kW = 40A

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