Electrician Red Seal · Question
For a 120/240V single-phase, 3-wire service, what colour tape is commonly used to identify the conductor with the higher potential to ground (the 'high leg') if part of a 3-phase system?
A 120/240V single-phase service has two 'hot' legs and a neutral. Both hot legs have a potential of 120V to ground. A 'high leg' only exists in a 120/240V 4-wir
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Question: For a 120/240V single-phase, 3-wire service, what colour tape is commonly used to identify the conductor with the higher potential to ground (the 'high leg') if part of a 3-phase system?
Answer options:
- Red
- Orange
- Blue ✅ This service does not have a 'high leg'.
Correct answer: This service does not have a 'high leg'.
Explanation: A 120/240V single-phase service has two 'hot' legs and a neutral. Both hot legs have a potential of 120V to ground. A 'high leg' only exists in a 120/240V 4-wire delta 3-phase system, where one phase has a potential of 208V to ground.
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