Equipotential Bonding and Insulating Joints

In tracks to tank installations of danger categories AI, All and B, the rail joints must be connected by good conducting cross connections [12]. There must be a bond between the tracks and the filling nozzles of the tank installation. 

If the protection current becomes too high due to this connection in cathodi-cally protected tank installations, then insulating joints are usually installed in the pipeline from the filling nozzle. Care must be taken that the continuity bond is not broken. If there is a danger of stray currents with dc railways due to a permanent connection between track and filling equipment, the continuity bond should be applied only during the filling process. 

On stretches of electric line, according to Ref. 12, filling tracks without overhead conductors are usually isolated from the rest of the rail network with insulating joints in order to keep the rail currents flowing to the tank installation as 

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