What ladders are effective at insulating a worker from electrical shock?

• A. clean and dry fiberglass and wood ladders only under 600V
• B. metal ladders
• C. plastic ladders
• D. aluminum ladders

Answer: (A)

When working near energized equipment, you want a ladder that won’t carry current to you. Non-conductive ladder materials, like fiberglass, are designed to resist electrical conduction, and wood ladders can also provide insulation when they’re dry. Keeping the ladder clean and dry is crucial because dirt and moisture can create paths for electricity to flow, reducing the insulating protection. Ladders are also rated for a maximum working voltage, so a ladder rated for up to 600V is considered safe for typical electrical tasks within that range.

Metal ladders (including aluminum) conduct electricity and can energize you if they contact a live source, so they’re unsafe for electrical work. Plastic ladders might be non-conductive, but they often aren’t rated for the same voltage protections or structural reliability as fiberglass or properly rated wood ladders, making them less dependable in electrical environments.

So the best practice is to use clean and dry fiberglass or wood ladders that are rated for up to 600V, which provides insulation and the right protection for typical electrical work.