Electrical cross bonding
Electrical cross bonding is required to create a zone in which voltage differences and therefore hazards from electrical shocks or sparks are minimised. This is achieved by connecting separate conductive components together with earthing cable.
This is necessary in case an electrical problem occurs on wiring or an appliance. It is possible for stray electrical currents to be transmitted to and through the gas pipework.
Source: http://www.sei.ie/index.asp?locID=413
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