When is it necessary to ground the trailer?

Commercial Driver License

When is it necessary to ground the trailer?

Only when filling a trailer with explosives.
When filling or unloading any flammable liquid tank. Ground must be maintained until filling hole is properly closed.
Only when unloading a cargo tank filled with any flammable liquid.

When filling or unloading any flammable liquid tank. Ground must be maintained until filling hole is properly closed.

CDL Manual Section: 9.5.3 – Flammable Liquids.

Tags: Hazardous Materials Test