In the event of dissimilar metals being present in piping, the joint ensuring electrical safety must be?

When dissimilar metals are present in piping systems, especially in the context of private fire service mains, ensuring electrical safety is essential to prevent corrosion caused by galvanic action. The correct approach in this scenario is to use insulation.

Insulating the joint between dissimilar metals helps to prevent electrical continuity, which can lead to corrosion due to the differences in electrochemical potential between the two metals. By insulating the connection, it minimizes the risk of galvanic corrosion occurring, thus prolonging the lifespan of the piping system and maintaining its integrity.

Grounding or bonding, while important in certain applications for ensuring electrical safety, doesn’t address the specific issue of dissimilar metals and the associated corrosion risk in this context. Capping, on the other hand, does not relate to addressing electrical safety between dissimilar metals.

Therefore, insulating the joint is the key method to mitigate the risks associated with dissimilar metals in piping systems.