Underground service-entrance conductors shall be protected against physical damage.

• A. True
• B. False
• C. Only in floodplains
• D. Not required

Answer: (A)

Underground service-entrance conductors face physical hazards from digging, vehicle traffic, and soil movement. To prevent damage that could cause insulation failure, shock, short circuits, or fires, these conductors must be protected. Protection can be provided by placing them in a suitable raceway such as conduit, using cables rated for direct burial with appropriate protection, or encasing the run in concrete where required. This requirement applies to all underground installations, not just in floodplains, and it is not optional.