Master Electrician Practice Exam

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Enhance your knowledge for the Master Electrician Test with multiple choice questions and detailed explanations. Prepare efficiently with our quiz and boost your confidence for the exam day!

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What is the maximum ampere rating for utilization equipment connected to a 20-ampere rated branch-circuit that serves lighting fixtures?

15 amperes
20 amperes
10 amperes
5 amperes

The correct answer is: 10 amperes

The maximum ampere rating for utilization equipment connected to a 20-ampere rated branch circuit serving lighting fixtures is determined by the National Electrical Code (NEC) guidelines. According to the NEC, for branch circuits rated at 20 amperes, the general rule states that continuous loads should not exceed 80% of the circuit's rated capacity to prevent overheating and ensure safety. Calculating 80% of a 20-ampere circuit gives you 16 amperes, which is the maximum allowance for continuous load. However, for lighting circuits specifically, it is common practice to limit the maximum load to 15 amperes. This is primarily for safety and reliability purposes, allowing for a margin that considers any inrush current or load fluctuations that may happen during normal operation. Thus, a limit of 15 amperes is recommended when considering utilization equipment connected to a 20-ampere circuit dedicated to lighting fixtures. This standard helps to ensure that the circuit operates well within safe limits, thus avoiding potential overloads or failure of the circuit.