ICC Residential Electrical Inspectors Practice Exam

What minimum branch circuit is required for electric ranges with a rating greater than 8.75 kVA?

1. 30 Amp

2. 40 Amp

3. 50 Amp

4. 60 Amp

The correct answer is: 40 Amp

For electric ranges with a rating greater than 8.75 kVA, the National Electrical Code (NEC) stipulates a specific minimum branch circuit requirement. In this case, the correct choice is a 40 Amp circuit. To understand this, we can look at how the amperage is calculated based on the kVA rating. An electric range rated greater than 8.75 kVA means it has significant power requirements, and typically, calculations are based on the formula: Amperage = kVA × 1000 / Voltage. Most residential electric ranges operate on a standard voltage of 240 volts. Therefore, for an 8.75 kVA rating, when you calculate the amperage: 8.75 kVA × 1000 / 240 volts = approximately 36.46 Amps. Given that circuits are typically installed with certain amperage ratings to ensure safety and efficiency, a 40 Amp circuit is necessary to handle this load while also accommodating any additional inrush currents that may occur when the range is first turned on. This rating ensures compliance with safety standards by allowing for a small buffer above the calculated requirement, reducing the risk of tripping breakers under load conditions. Selecting a circuit larger than is