SC Electrician Practice Questions - South Carolina Electrician Contractor Examination Exam

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In which of the following installations is the grounded (neutral) conductor counted as a current-carrying conductor for ampacity adjustment?

A 120/240-volt, single-phase, 3-wire feeder that carries only unbalanced current on the neutral A 3-wire circuit consisting of two phase conductors and the neutral of a 4-wire, 3-phase, wye-connected system A dedicated 240-volt, 2-wire line-to-line water-heater circuit with no neutral A 120/240-volt range circuit whose neutral carries only imbalance from a balanced 240-volt heating element

Correct Answer:

A 3-wire circuit consisting of two phase conductors and the neutral of a 4-wire, 3-phase, wye-connected system

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