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Questions and Answers
What must the temperature rating of bare or covered conductors equal when installed with insulated conductors?
Which of the following statements about a neutral conductor that carries unbalanced currents is true?
In a 3-wire circuit with two phase conductors and a neutral conductor, the neutral is considered current-carrying when it is part of which system?
Why must the neutral conductor be considered a current-carrying conductor in a 4-wire, 3-phase wye circuit with nonlinear loads?
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When applying the provisions of 310.15(B)(3)(a), what should be true about the neutral conductor in certain configurations?
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Study Notes
Bare or Covered Conductors
- When installing bare or covered conductors alongside insulated conductors, the temperature rating of the bare or covered conductor must match the lowest temperature rating of the insulated conductors to determine ampacity.
Neutral Conductor
- A neutral conductor carrying only the unbalanced current from other conductors in the same circuit doesn't need to be included when applying the ampacity rules of 310.15(B)(3)(a).
- In a 3-wire circuit with two phase conductors and a neutral conductor connected to a 4-wire, 3-phase, wye-connected system, the neutral conductor carries nearly the same current as the line-to-neutral load currents of the other conductors and needs to be included when applying the ampacity rules of 310.15(B)(3)(a).
- On a 4-wire, 3-phase wye circuit with a significant portion of non-linear loads, harmonic currents are present in the neutral conductor. This means the neutral conductor is considered a current-carrying conductor.
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Description
This quiz covers the key concepts related to bare or covered conductors and neutral conductors in electrical installations. It explains how the temperature ratings and current-carrying capacities impact the application of ampacity rules. Test your knowledge on these crucial electrical principles involving 3-wire and 4-wire circuits.
