Each phase of a three-phase system will have an identifier. Depending on the company, it is either:

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Multiple Choice

Each phase of a three-phase system will have an identifier. Depending on the company, it is either:

Phase identifiers distinguish the three conductors in a three-phase system, and there isn’t a single universal label everyone uses. Different companies adopt different schemes. You’ll often see ABC, but some organizations use XYZ or 123 as the phase identifiers. The idea here is that labeling can vary by practice, so acknowledging all three possibilities reflects real-world conventions. That’s why this option is the best choice—it recognizes multiple acceptable naming schemes rather than restricting to just one. The other options suggest only one scheme exists, which doesn’t align with how labeling is commonly handled in the industry.

Phase identifiers distinguish the three conductors in a three-phase system, and there isn’t a single universal label everyone uses. Different companies adopt different schemes. You’ll often see ABC, but some organizations use XYZ or 123 as the phase identifiers. The idea here is that labeling can vary by practice, so acknowledging all three possibilities reflects real-world conventions. That’s why this option is the best choice—it recognizes multiple acceptable naming schemes rather than restricting to just one. The other options suggest only one scheme exists, which doesn’t align with how labeling is commonly handled in the industry.

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