When product transfer occurs, it is important to ensure that the containers involved are at earth potential. This can be achieved by grounding them using clamps and cables which go back to a common grounding bar, as shown. An alternative method is shown in 'CA03 - Grounding drums and containers with storage rack'.

NFPA77 states that: Bonding should be done with a clamp having hardened steel points that will penetrate paint, corrosion products and accumulated material using either screw force or a strong spring. (7.13.3).
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