Power-limited fire alarm conductors may be placed within 2 inches of insulated power conductors if what condition is met?

Power-limited fire alarm conductors may be placed within 2 inches of insulated power conductors if what condition is met?

• A. a continuous, firmly fixed barrier
• B. shielded by metal conduit
• C. a plastic barrier
• D. not allowed under NEC

Answer: (A)

The main idea is that when power-limited fire alarm conductors run within close proximity to insulated power conductors, a physical separation is required to protect them. This is allowed only if there is a continuous, firmly fixed barrier between the two sets of conductors. That barrier keeps the fire alarm conductors physically and electrically isolated, preventing contact, arcing, or heat transfer inside the same enclosure or raceway. It has to be continuous along the entire run and securely attached so it won’t shift. Shielding with metal conduit or a plastic barrier by itself isn’t the specified condition the code requires, and the rule isn’t “not allowed” as long as the barrier is present. So the required condition is a continuous, firmly fixed barrier.

The main idea is that when power-limited fire alarm conductors run within close proximity to insulated power conductors, a physical separation is required to protect them. This is allowed only if there is a continuous, firmly fixed barrier between the two sets of conductors. That barrier keeps the fire alarm conductors physically and electrically isolated, preventing contact, arcing, or heat transfer inside the same enclosure or raceway. It has to be continuous along the entire run and securely attached so it won’t shift. Shielding with metal conduit or a plastic barrier by itself isn’t the specified condition the code requires, and the rule isn’t “not allowed” as long as the barrier is present. So the required condition is a continuous, firmly fixed barrier.