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ELECTRICAL INSTALLATION PLANNING

ELECTRICAL INSTALLATION PLANNING. LSEGG307A 9080F. 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. Maximum Demand

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ELECTRICAL INSTALLATION PLANNING

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  1. ELECTRICAL INSTALLATION PLANNING LSEGG307A 9080F

  2. 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.

  3. Maximum Demand Non-Domestic Load are generally heavier Stay on for longer periods of time Heating & cooling has an effect on load

  4. Residential Instillations • Hotels • Boarding Houses • Hospitals • Motels • etc AS/NZS 3000 Table C2 Colum 2

  5. 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

  6. 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) = 16600230 = First Point Balance

  7. Residential Installations 10A Power Points Load group B If this section of building DOES NOT HAVE fixed heating/cooling HAS Load Group Bi Load Group Bii 20 Double power points 72.2A 21.3A 20 x 2 = 40 Points 1000W + (39 x 100W) = 1000W + (39 x 400W) = 16600230 = 4900230 = First Point Balance

  8. 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 0.5 x 15A = 7.5A 45A

  9. Residential Installations Power Points 3 Outlets Load Group B 10A 3 Outlet A B C 1 Point 1 Point 1 Point

  10. Exercise 1 An air conditioned motel consists of the following: A A A Bii Bii Biii Bii A B C A B C A B C ((30x60)230)x0.75 = 5.87A 17.4A 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 ((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 = (1000230)+15+((2x15)x0.5) = 23.3A 29.5A 42.1A NSW S&IR Clause 1.10.3 Less than 25A difference

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

  12. Factories Lighting 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

  13. Factories AS/NZS 3000 2.2.2. 10A Power Points • 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) = 30250230 = First Point Balance

  14. Factories 10A Power Points Load group B If this section of building DOES NOT HAVE fixed heating/cooling HAS Load Group Bi Load Group Bii 20 Double power points 21.3A 131.5A 20 x 2 = 40 Points 1000W + (39 x 100W) = 1000W + (39 x 750W) = 30250230 = 4900230 = First Point Balance

  15. 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 0.75 x 15A = 11.25A 57.5A

  16. Welders AS/NZS 3000 C2.5.2.2 (b) 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 • 3 x 20A 3 Welders

  17. C3Commercial & 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

  18. C3Commercial & Light industrial 10 x 10 = 100 m2 From C3 Light & power (average value)= 70 VA/m2 10 metre x 10 metre air conditioned shop Air conditioning= 30 VA/m2 100 VA/m2 100 m2 x 100 VA/m2 = 10kVA = 14.4A / 400 x √3

  19. 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

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

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

  22. 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

  23. Duty Cycle 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

  24. 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

  25. Domestic Cooking Appliances Table C4 4.8kW wall oven = 6.8kW wall oven = 9kW wall oven + 4.8kW hotplate = 16A 20A 13.8kW = 40A

  26. NEXT LESSON TEST

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