Electrician Red Seal · Question
A retail store is upgrading its lighting. An electrician is installing 20 new LED light fixtures, each drawing 0.5 A at 120 V. The fixtures will be connected to a dedicated 20 A branch circuit. What is the maximum number of additional identical fixtures that can be added to this circuit, assuming the circuit is protected by a 80% continuous load factor and no other loads will be connected?
A 20 A circuit, when subject to an 80% continuous load factor (Rule 8-104(2)), can handle a maximum continuous load of 16 A (0.80 x 20 A). The existing 20 fixtu
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Question: A retail store is upgrading its lighting. An electrician is installing 20 new LED light fixtures, each drawing 0.5 A at 120 V. The fixtures will be connected to a dedicated 20 A branch circuit. What is the maximum number of additional identical fixtures that can be added to this circuit, assuming the circuit is protected by a 80% continuous load factor and no other loads will be connected?
Answer options:
- 10 additional fixtures ✅ 12 additional fixtures
- 15 additional fixtures
- 20 additional fixtures
Correct answer: 12 additional fixtures
Explanation: A 20 A circuit, when subject to an 80% continuous load factor (Rule 8-104(2)), can handle a maximum continuous load of 16 A (0.80 x 20 A). The existing 20 fixtures draw 10 A (20 x 0.5 A). This leaves 6 A (16 A - 10 A) available for additional fixtures. Since each fixture draws 0.5 A, an additional 12 fixtures (6 A / 0.5 A per fixture) can be added.
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