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Calculate the correct wire gauge (AWG) for your HVAC equipment based on amperage, distance, and voltage. NEC compliant.
Correct wire sizing prevents voltage drop, overheating, and code violations. For HVAC equipment, you need wire rated for the unit's Maximum Circuit Ampacity (MCA) at the required distance from the panel to the disconnect or unit.
Most residential AC condensers (up to 3.5 tons) use 10 AWG on a 30-amp breaker. Larger 4-5 ton units often need 8 AWG on a 40-50 amp breaker. Furnaces typically use 14 AWG on a 15-amp circuit. Always check the unit's nameplate for MCA and MOCP (Maximum Overcurrent Protection).
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