What Size Circuit Breaker For Bathroom

Multiply 20 amps by 120 volts for a total of 2 400 watts.

What size circuit breaker for bathroom. A basic wiring plan for a bathroom includes a 20 amp gfci protected circuit for the receptacles and a 15 amp general lighting circuit for the switches light fixtures and vent fan. Therefore a 50a device can be selected. A 1500 watt heater on a 120 volt circuit thus needs a breaker of 15 6 amps. The wires electrical conductors between the 20 amp rated circuit breaker and this gfci outlet receptacle or any outlet receptacle must be at least 20 amp rated gauge 12.

When considering bathroom receptacles keep correct placement in mind. Your total wattage now equals 29 750 20 750 6 600 2 400 29 750. Ideally you want your circuit to be operating at 80 percent of capacity which is called the safe load. Multiply 30 amps by 220 volts for a total of 6 600 watts.

The general rule of thumb is that circuit breaker size should be 125 of the ampacity of cable and wire or the circuit which has to be protected by the cb. In some areas the lighting and receptacles must be on separate circuits so that if a receptacle trips the circuit breaker the lights won t go out. Rounded up to 50a. Multiply the value for current by 125 percent to determine the size of the breaker you need for the heater.

This is a bare minimum however and most bathrooms will have at least two receptacles and often as many of four or five. Ocpd 100 noncontinuous load 125 continuous load 1 00 x 30a 1 25 x 16a 50a. Although 100 rated devices typically are not available in sizes this small the permitted rating would still be 50a 16a 30a 46a. To determine the appropriate size of circuit breaker for single phase supply it depends on multiple factors like type of load cable material and environment temperature etc.

The minimum requirement for outlet receptacles in a bathroom is one gfci protected receptacle served by a 20 amp circuit. The bulk of breakers used is residential electronic circuits are 20 volts although larger ones can be necessary for more powerful appliances. 15 amps outlet receptacles are rated for 20 amps feed through. Fifteen ampere receptacles are permitted on 20 ampere multioutlet branch circuits by 210 21 b 3 table 210 21 b 3 210 24 and table 210 24.

It doesn t matter if the end device is 15 or 20 amps rated.