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Wiring system for solar PV

lyledunn

Neat enough job and probably technically compliant, but is it sensible to put the DC side conductors in metallic trunking and conduit even if they do meet the class 2 or equivalent requirement? 

I am aware that there are SWA cables specifically for solar PV, so I guess there is not much difference if the SWA is earthed. However, on a slightly different point, if these SWA DC cables are buried, what is the point of earthing the wire armour?

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    Putting DC PV conductors in metallic trunking or conduit is generally allowed if Class II insulation is maintained, but it raises practical concerns. Metallic containment can introduce thermal issues and complicate fault isolation. SWA for DC is common, and earthing the armour is about touch-voltage safety, not circuit protection—especially if buried. The key is compliance with BS 7671 Section 521 and PV-specific guidance: maintain double insulation, manage segregation, and ensure bonding where required.
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    Putting DC PV conductors in metallic trunking or conduit is generally allowed if Class II insulation is maintained, but it raises practical concerns. Metallic containment can introduce thermal issues and complicate fault isolation. SWA for DC is common, and earthing the armour is about touch-voltage safety, not circuit protection—especially if buried. The key is compliance with BS 7671 Section 521 and PV-specific guidance: maintain double insulation, manage segregation, and ensure bonding where required.
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