A tank trucks is often the largest potentially isolated conductor which is brought on site and if incorrectly grounded, may pose a significant ignition risk.

When filling and emptying tank trucks, both CLC/TR 50404 and NFPA77 recommend that fully interlocked static grounding systems are used (see CA09 - Grounding of a tank truck).  However, in cases where an interlock is not possible, a self-testing clamp provides operator feedback via the built-in LED, ensuring that a low resistance connection has been made through paint or rust etc. to the metalwork of the truck chassis.

BS5958 states that:  During loading the vehicle should be earthed .... so that the resistance to earth is at all points less than 10 Ohms (7.2.1).

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