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Question about Earthing my data equipment
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 555375" data-attributes="member: 250"><p>Running a cable from these cabinets back to 'The CU' / 'meter cupboard Main Earth Terminal' would NOT be an earth cable! (A cable from the exposed metal work to the CU/MET would be a 'protective bonding conductor').</p><p></p><p>If these metal data cabinets are considered to be extraneous conductive parts, </p><p>i.e. liable to introduce an earth potential, (which personally I doubt?), then I could see a need for a protective bonding conductor. However the earthing arrangements for the electrical installation / garage installation, (TN -vs- TT), would need to be taken into account when assessing what size bonding conductor was needed. (10mm could be overkill, if it is needed at all?) </p><p></p><p>All adequate earthing should have been provided by the circuit protective conductor(s) of the sockets supplying any items of equipment mounted inside the cabinet. I would have thought all that would be needed is a short earth connection from the metal cabinet onto the CPC connections of the supply circuit.. (similar to an earth fly-lead from a socket back-box onto a double socket.).. </p><p></p><p>I can't see any need for the CSA to be greater than the CSA of the CPC of the supply circuit? If a fault occurred where the metal cabinet did become live, then the protective device(s) for the supply circuit should operate fast enough to remove any danger. </p><p></p><p>There are some situations where adding connections between metal parts can introduce greater hazards in the event of a fault.. </p><p></p><p>Some things are hard to second guess over the internet.... It could be worth getting a qualified competent electrician round to check over exactly what your set-up is?</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 555375, member: 250"] Running a cable from these cabinets back to 'The CU' / 'meter cupboard Main Earth Terminal' would NOT be an earth cable! (A cable from the exposed metal work to the CU/MET would be a 'protective bonding conductor'). If these metal data cabinets are considered to be extraneous conductive parts, i.e. liable to introduce an earth potential, (which personally I doubt?), then I could see a need for a protective bonding conductor. However the earthing arrangements for the electrical installation / garage installation, (TN -vs- TT), would need to be taken into account when assessing what size bonding conductor was needed. (10mm could be overkill, if it is needed at all?) All adequate earthing should have been provided by the circuit protective conductor(s) of the sockets supplying any items of equipment mounted inside the cabinet. I would have thought all that would be needed is a short earth connection from the metal cabinet onto the CPC connections of the supply circuit.. (similar to an earth fly-lead from a socket back-box onto a double socket.).. I can't see any need for the CSA to be greater than the CSA of the CPC of the supply circuit? If a fault occurred where the metal cabinet did become live, then the protective device(s) for the supply circuit should operate fast enough to remove any danger. There are some situations where adding connections between metal parts can introduce greater hazards in the event of a fault.. Some things are hard to second guess over the internet.... It could be worth getting a qualified competent electrician round to check over exactly what your set-up is? [/QUOTE]
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