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Do-It-Yourself (DIY) Question & Answer Forum
Routing 16sqmm SWA externally - recommendations?
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<blockquote data-quote="leesparkykent" data-source="post: 429053" data-attributes="member: 26673"><p>Table 54.7 is to calculate/select the cross sectional area of every protective conductor, <u><strong>other than a protective bonding conductor. </strong></u></p><p></p><p>Regulation 544.1.1 states the minimum CSA of bonding conductors except where PME conditions apply. Where PME conditions supply the CSA should be selected using table 54.8.</p><p></p><p>Both 544.1.1 and table 54.8 state that these sizes are for copper conductors and if the bonding conductor is not copper then the other metal used needs to offer equivalent conductance.</p><p></p><p>0.004 is the simplified resistance coefficient per degree C at 20 degree C given by BS 6360 for copper and aluminium conductors.The resistivity of steel changes with carbon content hence the ratio given in guidance note 8.</p><p></p><p>The charts/tables you are referring to are all for using the armour as a circuit protective conductor not a protective bonding conductor.</p></blockquote><p></p>
[QUOTE="leesparkykent, post: 429053, member: 26673"] Table 54.7 is to calculate/select the cross sectional area of every protective conductor, [U][B]other than a protective bonding conductor. [/B][/U] Regulation 544.1.1 states the minimum CSA of bonding conductors except where PME conditions apply. Where PME conditions supply the CSA should be selected using table 54.8. Both 544.1.1 and table 54.8 state that these sizes are for copper conductors and if the bonding conductor is not copper then the other metal used needs to offer equivalent conductance. 0.004 is the simplified resistance coefficient per degree C at 20 degree C given by BS 6360 for copper and aluminium conductors.The resistivity of steel changes with carbon content hence the ratio given in guidance note 8. The charts/tables you are referring to are all for using the armour as a circuit protective conductor not a protective bonding conductor. [/QUOTE]
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Routing 16sqmm SWA externally - recommendations?
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