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Earthing and Bonding

Former Community Member
Former Community Member
Hi All


Working on a scheme whereby we have a private transformer serving the site - TN-S arrangement. This comes into the building, we then split to feed a switchboard in one part of the building which is existing, the second split heads to a new build part which has the second switchboard. This new build contains swimming pool. The supply to the new switchboard is via a busbar 3L+N+PER. Question relating to earth bars - we currently have the main earthing bar at the intake point which is at the existing switchboard location - we then had cable feeding out to the new earth bar at the new switchboard location. Contractor is proposing that they remove this interlinking earth cable between bars, and take a bond directly from the new switchboard earth bar to the new earth bar in the room. Does this sound feasible - to me doesnt sound right, but I can't find anything specific to say not.


Many thanks
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    If it helps at all, where an installation spans several buildings, it's usual to have a "main earth terminal" for each building (often called a building earth marshalling terminal in subsidurary buildings to distinguish it from the installation's MET) - the idea being that all c.p.c.s and bonding conductors are brought together within each building - so minimising the potential difference between parts within each building.  So there's little need to have separate bonding and earthing conductors between buildings - as they'd be connected together at both ends anyway - the only exception I can think of is where the main cable's c.p.c. (e.g. steel wire armour) isn't sufficient for a bonding conductor and so another G/Y is run alongside - in parallel.


       - Andy.
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  • 0
    If it helps at all, where an installation spans several buildings, it's usual to have a "main earth terminal" for each building (often called a building earth marshalling terminal in subsidurary buildings to distinguish it from the installation's MET) - the idea being that all c.p.c.s and bonding conductors are brought together within each building - so minimising the potential difference between parts within each building.  So there's little need to have separate bonding and earthing conductors between buildings - as they'd be connected together at both ends anyway - the only exception I can think of is where the main cable's c.p.c. (e.g. steel wire armour) isn't sufficient for a bonding conductor and so another G/Y is run alongside - in parallel.


       - Andy.
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