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Understanding Residential Wiring for HVAC Systems

Learn the basics of residential wiring for HVAC systems, including panel boxes, circuit breakers, wire sizes, and safety considerations. Understand how to wire single and double pole breakers and use proper connectors and fuses. Ensure safe electrical connections.

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Understanding Residential Wiring for HVAC Systems

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  1. HVAC 130 Residential Wiring A basic circuit requires three things • Apower source • A conductive path • An electrical resistance (Load)

  2. PANEL BOX • Power Company supplies power to your residence • This power is step down for useable voltage from a transformer on the power pole • This useable power (240v) is brought into your residence to your panel box

  3. Electrical Power Supplied • a. Residences are furnished with single phase power • b. Many houses can be supplied power from the transformer

  4. Electrical Power Supplied • c. Electrical panel • 1. Power enter from the transformer • 2. Power is fed through circuit breakers • 3. Power is distributed throughout the house • d. Typical panel furnishes 120 and 240 volt service

  5. Panel Box • Fuse or circuit breaker • Single Pole breakers for 120 volt • Double Pole breakers for 240 volt

  6. Panel Box

  7. Panel box must be grounded

  8. 100 amp panel

  9. Neutral bar

  10. Ground bar

  11. Single pole15 amp breaker

  12. Single Pole 20 amp breaker

  13. Double Pole 30 Amp Breaker

  14. 120v componets • Switch • Outlet • Light

  15. 120v single pole switch

  16. Single pole switch symbol

  17. 120v 3 way switch

  18. 3 way switch symbol

  19. 120v 4 way switch

  20. 4 way switch symbol

  21. 120v Outlet

  22. Outlet symbol

  23. 15 amp & 20 amp

  24. Ungrounded and grounded wall outlet

  25. Light fixture

  26. Light symbol

  27. 2 x 4 box

  28. 4 x 4 box

  29. Wire Size

  30. Romex • Commonly used in residential • Identified by size/conductors 14-2 & 14-3 gage conductors & a ground 12-2 w/g has 2 - 12 gage conductors & a ground 10-2 w/g has 2 – 10 gage conductors & a ground

  31. 14/2 with ground

  32. 14/3 with ground

  33. 12/2 with ground

  34. 10/2 with ground

  35. Wire stripers

  36. Striping the insulation

  37. Bending a loop

  38. loop

  39. Romex connectors

  40. Installing connector

  41. Wire Nuts

  42. FUSES • Still in use in disconnects, especially in residential • Longer fuses are used in higher voltage applications NOTE: For A/C and Refrigeration equipment are normal sized at 175% of the rated full load current

  43. Fused Disconnects • Provide disconnect & fused protection • Required by NEC on all units for safety

  44. Fuse symbol

  45. Fused disconnect

  46. Non-Fused Disconnect

  47. How to wire a single pole breaker Ground Neutral 120v (Hot)

  48. How to wire a double pole breaker Ground 120v (Hot) 240v 120v (Hot))

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