The parallel conductors in each phase or neutral shall ___.

The parallel conductors in each phase or neutral shall ___.

• A. Have the same insulation type and conductor material
• B. Be the same size in CMA
• C. Be the same length and be terminated in the same manner
• D. All of these

Answer: (D)

When you run conductors in parallel to carry a single circuit, the current splits based on each conductor’s impedance. If the conductors differ in material, insulation, size, or length, their impedance won’t be the same, so the current won’t share evenly. That can lead to overheating, unequal loading, and voltage differences among the parallel paths. To ensure equal current distribution and safe operation, all parallel conductors in each phase or neutral must have identical electrical characteristics: same insulation type and conductor material, the same cross-sectional size, and the same length, and they should be terminated in the same manner. Keeping them in the same raceway or assembly helps maintain the same operating conditions. Because all of these requirements are necessary, the best answer is that all of these apply.

When you run conductors in parallel to carry a single circuit, the current splits based on each conductor’s impedance. If the conductors differ in material, insulation, size, or length, their impedance won’t be the same, so the current won’t share evenly. That can lead to overheating, unequal loading, and voltage differences among the parallel paths. To ensure equal current distribution and safe operation, all parallel conductors in each phase or neutral must have identical electrical characteristics: same insulation type and conductor material, the same cross-sectional size, and the same length, and they should be terminated in the same manner. Keeping them in the same raceway or assembly helps maintain the same operating conditions. Because all of these requirements are necessary, the best answer is that all of these apply.