Why does the bucket in a bucket truck need to be solid to maintain grounding?

Question

I’m watching this arborist on YouTube and they have a truck with a bucket on an arm so they can reach heights without climbing. On/after a rainy day the bucket will accumulate water and they mentioned they can’t drill a hole to drain because it will compromise the grounding.

My understanding of grounding/electricity doesn’t explain this. Can someone help me understand why this would make a difference?

Edit: I get it, I/he should have said “electrical isolation” instead of “grounding”. Either way, a hole allowing a stream of dirty water seems to be the answer here. Thanks 🙂

In: Physics

Answer 1

A solid bucket in a bucket truck maintains electrical isolation, acting as a Faraday cage to ensure operator safety. A hole would compromise isolation, allowing water and contaminants to enter and creating a pathway for electrical shock.