Why do fire trucks have chains hanging from the axles?Posted 14 February 2011 by admin
I thought it might have something to do with electrical grounding but that is just my guess.
I also just found out that they have automatic chains for traction in bad weather.
they are chains for snow/ice conditions. The chains are air-actuated; A wheel is mounted horizontally and rubs against the sidewall of the tire causing it to spin. Small lengths of chain are attached around the wheel and hang down, so when the wheel spins it swings the chains out and they go underneath the tire, giving it more traction.
You will see grounding chains or metal braided straps that drag on the ground on fuel tankers… Those are for actual grounding of static electrcity.