Ladder requirements in manholes specify that any ladder present must be fixed and corrosion resistant. Which option aligns with this requirement?

• A. Ladders may be removable
• B. Ladders must be fixed and corrosion resistant
• C. Ladders must be wooden only
• D. Ladders must be non-conductive

Answer: (B)

Ladder requirements in manholes focus on safety and durability in a damp, corrosive environment. The ladder must be fixed to the structure so it cannot move or be removed during entry or exit, ensuring a reliable path in an emergency and during regular work. It also must be corrosion resistant to withstand moisture, sewer gases, and any chemicals without deteriorating, which is essential for longevity and safety. The option that says the ladder must be fixed and corrosion resistant exactly matches these needs, so it is the correct choice. The other options don't fit: removable ladders compromise security and stability; wooden-only ladders may rot or degrade in wet underground conditions and may not meet corrosion resistance requirements; non-conductive ladders address electrical isolation but do not satisfy the stated requirement of being fixed and corrosion resistant.