ICC Residential Electrical Inspectors Practice Exam

What is the standard rating for utilization equipment fastened in place for 15-amp circuits?

1. Cannot exceed 50% of the circuit rating

2. Must be equal to the circuit rating

3. Must be at least 75% of the circuit rating

4. Has no limit imposed

The correct answer is: Cannot exceed 50% of the circuit rating

For utilization equipment that is fastened in place and connected to a 15-amp circuit, the standard rating must not exceed 50% of the circuit rating. This limitation is based on the National Electrical Code (NEC) requirements, which aim to ensure that the circuit is not overloaded. Fastened-in-place equipment typically includes appliances and devices that are permanently installed, and therefore the load needs to be managed carefully to protect both the equipment and the circuit from potential overload conditions. The rationale behind this 50% guideline is to maintain safe operation within the electrical system and allow for additional loads that might be connected to the same circuit. Overcurrent protection and heat generation must be considered; thus, ensuring that utilization equipment does not exceed this limit helps prevent tripping breakers or causing damage to wiring and connected devices. Other options suggest different thresholds that do not align with the NEC's guidelines for utilization equipment fastened in place; for instance, suggesting that the equipment should exceed, match, or have no limits at all deviates from the intent of safe circuits management.