What is the demand load, in amps, for one household electric...

What is the demand load, in amps, for one household electric range with a nameplate rating of $16.75 \mathrm{~kW}, 10,240 \mathrm{~V}$ ?
a. $39.79 \mathrm{~A}$
b. $41.67 \mathrm{~A}$
c. $48.25 \mathrm{~A}$
d. $53.33 \mathrm{~A}$

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Key Concepts

Nameplate Rating

The nameplate rating is the manufacturer?specified maximum power consumption of an appliance under standard operating conditions. It tells you the maximum kilowatt (kW) level the device is designed to draw, which is essential when calculating the electrical load and sizing the circuit or protective devices appropriately.

Demand Factor (NEC Maximum Demand Concepts)

In many installations, appliances such as electric ranges are not expected to operate at their full nameplate load continuously. The National Electrical Code (NEC) allows a reduction—a demand factor—for certain appliances. In the case of household ranges, NEC Table 220.55 provides a method for calculating a lower 'demand load' by starting with a base value and then adding a percentage (typically 40% for ranges over 12 kW) of the excess over 12 kW. This adjustment reflects realistic usage patterns where all heating elements and oven features are unlikely to be used simultaneously.

Conversion of Power to Current

Once the demand load in kilowatts is determined, it is converted to electrical current (in amperes) using the fundamental relationship I = P/V, where I is current, P is power (in watts), and V is voltage. This conversion is key to determining the proper conductor size and overcurrent protection for the circuit.

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