A 240 V branch circuit rated at 30 A is used for a cord-and-plug connected appliance and must not exceed 80% of the branch circuit rating. What is the maximum load in VA?

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Prepare for the ICC Residential Electrical Inspector Level 1 exam with multiple choice questions, flashcards, and detailed explanations. Master your understanding of the residential electrical code to ensure success.

Multiple Choice

A 240 V branch circuit rated at 30 A is used for a cord-and-plug connected appliance and must not exceed 80% of the branch circuit rating. What is the maximum load in VA?

Explanation:
The main idea is that for a cord-and-plug connected appliance on a branch circuit, you limit the continuous load to 80% of the circuit rating to prevent overheating. So the allowable current is 0.8 × 30 A = 24 A. The maximum load in volt-amperes is 240 V × 24 A = 5760 VA. This matches the given answer. The other options would come from using full rating (7200 VA) or miscalculations like 240 V × 20 A (4800 VA) or 240 V × 25 A (6000 VA), which ignore the 80% limit.

The main idea is that for a cord-and-plug connected appliance on a branch circuit, you limit the continuous load to 80% of the circuit rating to prevent overheating. So the allowable current is 0.8 × 30 A = 24 A. The maximum load in volt-amperes is 240 V × 24 A = 5760 VA. This matches the given answer. The other options would come from using full rating (7200 VA) or miscalculations like 240 V × 20 A (4800 VA) or 240 V × 25 A (6000 VA), which ignore the 80% limit.

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