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Earth bar test links

Former Community Member
Former Community Member
I've been looking at an earthing schematic from a recent hospital installation and noted that the main earth bar was equipped with a test link, but the main LV panel earth bar wasn't.


Can someone explain if this is correct as I expected to see test links on both?
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    I guess it depend on what you'd expect to use the links for - i.e. how things would be tested. Hospital installations are way above my head (and with all sorts of extra requirements I don't doubt), but for a more ordinary installation you'd only really be interested in disconnecting the main Earthing conductor from the MET in order to test the supplier's earth facility independently of any parallel paths created by the installation itself. Deeper into the installation disconnecting earthing or bonding conductors get a bit futile as you risk all sorts of parallel connections via exposed- and extraneous-conductive-parts that can't readily be avoided, so many tests just assume the installation's side of the earthing system is just 'one lump' and don't attempt to sub-divide it.


    Even when disconnection for testing is required, a dedicated moveable link isn't always necessary - if the relevant conductors can be readily disconnected themselves then disconnection can be done that way instead. Many domestic METs for example don't have links at all.


    All horses for courses really.


       - Andy.
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  • 0
    I guess it depend on what you'd expect to use the links for - i.e. how things would be tested. Hospital installations are way above my head (and with all sorts of extra requirements I don't doubt), but for a more ordinary installation you'd only really be interested in disconnecting the main Earthing conductor from the MET in order to test the supplier's earth facility independently of any parallel paths created by the installation itself. Deeper into the installation disconnecting earthing or bonding conductors get a bit futile as you risk all sorts of parallel connections via exposed- and extraneous-conductive-parts that can't readily be avoided, so many tests just assume the installation's side of the earthing system is just 'one lump' and don't attempt to sub-divide it.


    Even when disconnection for testing is required, a dedicated moveable link isn't always necessary - if the relevant conductors can be readily disconnected themselves then disconnection can be done that way instead. Many domestic METs for example don't have links at all.


    All horses for courses really.


       - Andy.
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