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LSEGG307A 9080F

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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 AS/NZS 3000 Table C2 Colum 2 Lighting 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 B i 20 Double power points 20 x 2 = 40 Points1000W + (39 x 400W) = First Point Balance 230 = 72.2A

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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 B i 20 Double power points 20 x 2 = 40 Points1000W + (39 x 100W) = First Point Balance 4900 230 = 72.2A HAS Load Group B ii 21.3A 1000W + (39 x 400W) = 230 =

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Residential Installations Load group B iii 1 st = full current of highest 2 x 20A power points 2 x 15A power points Power Points Larger than 10A 2 nd = 50% x full current 3 rd = 50% x full current 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 AA 1 Point BB CC 1 Point1 Point

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Exercise 1 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 An air conditioned motel consists of the following: A A A B ii B iii B ii ((30x60) 230)x0.75 = 5.87A 17.4A 23.3A AA BB CC AA BB CC AA BB CC 7.83A 21.7A 7.83A 34.3A ((6x400) 230)x0.75 = 31P (1000+(30x100)) 230 = 11+30P (1000+(40x100)) 230 = (1000 230)+15+((2x15)x0.5) = 29.5A42.1A ((40x60) 230)x0.75 = 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 AS/NZS 3000 Table C2 Colum 3 Lighting 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 B If this section of building DOES NOT HAVE fixed heating/cooling Load Group B i 20 Double power points 20 x 2 = 40 Points1000W + (39 x 750W) = First Point Balance 230 = 131.5A Calculation Assessment Measurement Limitation AS/NZS

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Factories 10A Power Points Load group B If this section of building DOES NOT HAVE fixed heating/cooling Load Group B i 20 Double power points 20 x 2 = 40 Points1000W + (39 x 100W) = First Point Balance 4900 230 = 131.5A HAS Load Group B ii 21.3A 1000W + (39 x 750W) = 230 =

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Factories Load group B iii 1 st = full current of highest 2 x 20A power points 2 x 15A power points Power Points Larger than 10A 2 nd = 75% x full current 3 rd = 75% x full current 20A 0.75 x 20 = 15A 0.75 x 15A = 11.25A 57.5A

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

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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 m 2 of floor area

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10 metre x 10 metre air conditioned shop From C3 10 x 10 =100 m 2 Light & power (average value)=70 VA/m 2 Air conditioning=30 VA/m VA/m m 2 x100 VA/m 2 =10kVA 400 x √3 = 14.4A /

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Single items on circuit Multiple items on circuit Diversity may be applied Current rating of appliance Limit by circuit breaker Welders Domestic cooking appliances Final Sub-circuits

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Arc Welding Machines Stick MIG TIG Types 1 st Machine 2 nd 3 rd 4 th 5 th + more 100% 85% 70% 60% Highest Lowest Rated Primary Current Actual Primary Current

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

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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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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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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 1 st Machine 2 nd + More 100% 60% Highest Lowest

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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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TEST

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