Furnace Circuit Breaker Size

This will provide the necessary overload protection for the circuit wiring and internal furnace components that are part of that 30 amp circuit.

Furnace circuit breaker size.

The best thing you can do is check the nameplate on the furnance where you will find the power and breaker requirements for your specific unit. The furnace uses the power. Because of the lower amperage rating of the 30 amp circuit of the new furnace the existing 60 amp circuit that will be connected to the 30 amp circuit should be changed to the 30 amp rating. However typically electric furnaces require a draw between 60 and 80 amps.

A single sheathed cable runs from the circuit breaker to a single pole light switch located next to the furnace. The exact amps an electric furnace requires is solely based on the size of the furnace and its performance capabilities. The size of a breaker is determined by the amp draw. As circuit breakers cbs and overcurrent protection devices ocpd are designed for 100 rated current i e.

By multiplying the volts by amps you will receive total wattage. A 30a circuit breaker can safely carry the exact 30a current but nec suggests 80 as a safe current limit as compared to the rated current. 80 of breaker max single phase breaker size wire size based on copper thhn wire increase one size when using aluminum conductors at 115 volts at 230 volts 15 amp 14 1 380 2 760 20 amp 12 1 840 3 680 30 amp 10 seldom used on 115 voltage 5 520 40 amp 8 seldom used on 115 voltage 7 360 50 amp 6 seldom used on 115 voltage 9 200 60. The switch connects to the furnace inside a wiring box.