LOW-VOLTAGE LIGHTING - PowerPoint PPT Presentation

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LOW-VOLTAGE LIGHTING

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  1. LOW-VOLTAGE LIGHTING

  2. Lighting VOLT: the force that moves electricity • Like water pressure • 240 volts for heavy equipment

  3. Lighting 120 volts for house voltage

  4. Lighting 12 volts is low voltage and safe

  5. Lighting CURRENT or AMPERAGE: the flow of electricity • Like water flow

  6. Lighting Ohms: measure of resistance • Like friction loss in irrigation • Resistance reduces voltage

  7. CIRCUIT PANEL • Each circuit 120 Volts • Overload, current exceeds capacity and overheats • Circuit breaker prevents overload

  8. CIRCUIT PANEL • Circuit fuse prevents overload

  9. LIGHTING BULBS Incandescent • Voltage through coiled filament • Converts to 90% heat and 10% • Filament evaporates tungsten (darkens bulb)

  10. LIGHTING BULBS Halogen • Voltage through coiled filament • Halogen gas in the bulb binds the tungsten to prevent darkening

  11. LIGHTING BULBS Halogen • <10.5 V does not heat up enough • Color shift

  12. LIGHTING BULBS Fluorescent (CFL) • Electricity travels through argon gas • Require ballast to supply start-up current • Contain mercury

  13. LIGHTING BULBS Solar Lights • Utilize LED light • Bluish light

  14. LIGHTING BULBS LED (Light emitting diode) • No filament • Doesn’t heat up significantly • Efficient • Directional

  15. LIGHTING BULBS Incandescent • 1,200 • 60 watts • $325/annually CFL • 8,000 • 12 to 15 watts • $76/annually LED • 50,000 hours • 6 to 8 watts • $32/annually LED Incandescent CFL

  16. LIGHT FIXTURE

  17. LIGHT FIXTURE

  18. LIGHT FIXTURE

  19. LIGHT FIXTURE

  20. LIGHT FIXTURE

  21. LIGHT FIXTURE

  22. LIGHT FIXTURE

  23. TRANSFORMERS • Converts 120 V to 12 V • 12 V taps (or higher) • Multiple taps

  24. TRANSFORMERS

  25. TRANSFORMERS

  26. TRANSFORMERS • Wattage capacity • 300W, 600W, 900W, or 1200W • Timer and photocell

  27. TRANSFORMERS

  28. TRANSFORMERS

  29. TRANSFORMERS

  30. Wattage Requirements • Add the wattage of all fixture connected • Use only 80% of transformerwattage

  31. Cable • WIRE SIZE, or AWG (American Wire Gauge) • The lower the number, the thicker the wire

  32. Cable Single circuit cable • 12/2

  33. CABLE Splicing cable • Quick connection

  34. Splicing cable • Wire nuts (DBY)

  35. Cable If wire is too small • Higher amps • Increased resistance • Increased heat • Fewer volts will get to lights