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Exported earth
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<blockquote data-quote="davetheglitz" data-source="post: 4397" data-attributes="member: 173"><p>Hi Slipshod - I understand where you're coming from with regard to TNCS - but apart from a cryptic mention in Caravan Parks (reg 708.411.4) - which says TNCS can't be used for caravans feeds - I can't back find any reference.</p><p></p><p>I've only got the 17th Edition version of the reg - but 542.1.8 says "Where a number of installations have separate earthing arrangements, any protective conductors common to any of these installations shall either be capable of carrying the maximum fault current likely to flow through them or be earthed within one installation only and insulated from the earthing arrangement in the other ...."</p><p></p><p>So TNCS can have a remote earth rod - providing the Protective Conductor is up to taking the max PFC for the system. The cross sectional area can be worked by the adiabatic equation or selected by selection from table 54.7.</p><p></p><p>Must admit I was surprised how small the conductor can be when applying the equation!</p></blockquote><p></p>
[QUOTE="davetheglitz, post: 4397, member: 173"] Hi Slipshod - I understand where you're coming from with regard to TNCS - but apart from a cryptic mention in Caravan Parks (reg 708.411.4) - which says TNCS can't be used for caravans feeds - I can't back find any reference. I've only got the 17th Edition version of the reg - but 542.1.8 says "Where a number of installations have separate earthing arrangements, any protective conductors common to any of these installations shall either be capable of carrying the maximum fault current likely to flow through them or be earthed within one installation only and insulated from the earthing arrangement in the other ...." So TNCS can have a remote earth rod - providing the Protective Conductor is up to taking the max PFC for the system. The cross sectional area can be worked by the adiabatic equation or selected by selection from table 54.7. Must admit I was surprised how small the conductor can be when applying the equation! [/QUOTE]
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