Installing phase conductors, neutral conductors, and equipment grounding conductors of a circuit together in the same metallic raceway is required to avoid induction that causes which effects?

Installing phase conductors, neutral conductors, and equipment grounding conductors of a circuit together in the same metallic raceway is required to avoid induction that causes which effects?

• A. Increased electrical resistance of conductors
• B. Heating of the metal raceway or enclosure
• C. Neither I nor II
• D. Both I and II

Answer: (D)

When phase, neutral, and equipment grounding conductors are installed together in the same metallic raceway, the magnetic fields from the current-carrying conductors interact in a way that minimizes stray induction in the raceway itself. Because the hot and neutral currents are equal and opposite, their fields largely cancel, which reduces the amount of induced current that can circulate in the metal of the raceway or enclosure. That helps prevent heat buildup from those induced currents. If induction does heat the raceway, the surrounding conductors can heat as well, and as temperature rises, the resistance of conductors increases. Keeping all three types of conductors together in the same metallic raceway minimizes these inductive heat effects and helps maintain safer, lower resistance paths. It also improves fault-path performance by keeping the grounding conductor in close, low-impedance contact with the other conductors. So the practice helps avoid heating of the metal raceway or enclosure, and, through reduced heating, the associated rise in conductor resistance.

When phase, neutral, and equipment grounding conductors are installed together in the same metallic raceway, the magnetic fields from the current-carrying conductors interact in a way that minimizes stray induction in the raceway itself. Because the hot and neutral currents are equal and opposite, their fields largely cancel, which reduces the amount of induced current that can circulate in the metal of the raceway or enclosure. That helps prevent heat buildup from those induced currents.

If induction does heat the raceway, the surrounding conductors can heat as well, and as temperature rises, the resistance of conductors increases. Keeping all three types of conductors together in the same metallic raceway minimizes these inductive heat effects and helps maintain safer, lower resistance paths. It also improves fault-path performance by keeping the grounding conductor in close, low-impedance contact with the other conductors.

So the practice helps avoid heating of the metal raceway or enclosure, and, through reduced heating, the associated rise in conductor resistance.