Circuit breaker calculator

A circuit breaker calculator is a tool that helps you determine the correct size and type of circuit breaker needed for a specific electrical circuit. Here's a simple calculator you can use:

Circuit Breaker Calculator

Enter the following information:

  1. Voltage (V): The voltage of the electrical circuit (e.g., 120V, 240V, etc.)
  2. Current (A): The maximum current that the circuit is expected to carry (e.g., 15A, 20A, etc.)
  3. Circuit Length (ft): The length of the electrical circuit (e.g., 10 ft, 20 ft, etc.)
  4. Number of Outlets: The number of outlets or devices connected to the circuit
  5. Type of Load: The type of load connected to the circuit (e.g., resistive, inductive, capacitive)

Calculator Output:

  1. Circuit Breaker Size (A): The recommended size of the circuit breaker needed for the circuit
  2. Circuit Breaker Type: The recommended type of circuit breaker (e.g., thermal-magnetic, magnetic-only, etc.)

Formulas Used:

  1. Circuit Breaker Size (A): Calculated using the following formula:

Circuit Breaker Size (A) = (Voltage (V) x Current (A)) / (Circuit Length (ft) x Number of Outlets)

  1. Circuit Breaker Type: Determined based on the type of load connected to the circuit and the calculated circuit breaker size.

Example:

Let's say you have a 120V electrical circuit with a maximum current of 20A, a circuit length of 20 ft, and 4 outlets. The type of load is resistive.

Calculator Output:

  1. Circuit Breaker Size (A): 16A
  2. Circuit Breaker Type: Thermal-magnetic circuit breaker

Note: This is a simplified calculator and does not take into account all the factors that can affect circuit breaker selection. It's always recommended to consult the National Electric Code (NEC) and local electrical codes for specific requirements. Additionally, it's recommended to consult with a licensed electrician if you're unsure about the calculation or the selection of the circuit breaker.