How to Calculate Electric Load for a Baseboard Electric Heater

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    • 1). Find the nameplate data tag on the electric baseboard heater. The nameplate data tag is generally located on the back of the baseboard heater unit. This information will also be provided on the specification sheet that came with the heater.

    • 2). Locate the overall wattage of the unit. Read the voltage that must be supplied to the baseboard heater. As an example, the wattage of a baseboard heater may be 2,000 watts, supplied with 240 volts.

    • 3). Divide the wattage by the voltage to find the amperage or load of the baseboard heater. Using the example, divide 2,000 watts by 240 volts for a load of 8.33 amperes.

    • 4). Use NEC Article 424 Section 3 to size the circuit breaker for the 8.33-ampere load. A 15-ampere circuit breaker should be used for the protection of the circuit device.

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