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HVAC 130. Residential Wiring A basic circuit requires three things A power source A conductive path An electrical resistance (Load). PANEL BOX. Power Company supplies power to your residence
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HVAC 130 Residential Wiring A basic circuit requires three things • Apower source • A conductive path • An electrical resistance (Load)
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
Electrical Power Supplied • a. Residences are furnished with single phase power • b. Many houses can be supplied power from the transformer
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
Panel Box • Fuse or circuit breaker • Single Pole breakers for 120 volt • Double Pole breakers for 240 volt
120v componets • Switch • Outlet • Light
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
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
Fused Disconnects • Provide disconnect & fused protection • Required by NEC on all units for safety
How to wire a single pole breaker Ground Neutral 120v (Hot)
How to wire a double pole breaker Ground 120v (Hot) 240v 120v (Hot))