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Flexible steel conduit as mechanical protection
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<blockquote data-quote="borneo" data-source="post: 520360" data-attributes="member: 34228"><p>Hello I’m new to the forum (posting on it anyway). I could do with some advice...</p><p></p><p> Over the last 2 years I have been subcontracted (labour only) to commission solar PV systems. Often these are newbuild properties and when I get there the panels are already on and the DC cabling done.</p><p></p><p> About half the time the inverter is downstairs next to the CU and so the DC cabling is routed in the plasterboard stud walls in flexible steel conduit and clipped every 40 cm. In some places this cable run is within 50 mm of the surface of the finished wall.</p><p></p><p> The main contractor who is responsible for selecting and specifying this conduit was under the impression that it was sufficient mechanical protection as per reg 522.6.204 (iv) but I think this is wrong.</p><p></p><p> I have mocked up the situation and done my own rudimentary test. The conduit deflects away from a nail or screw in between clips, but if it happens where the clip is, or where the conduit is otherwise held, then on the nail or screw will easily pass through.</p><p></p><p> So, in order to asses the risks, my questions are -</p><p></p><p>What are the risks from the DC cabling?</p><p> What would happen if someone did put a screw or nail etc into one of the string cables?</p><p> What would happen if they hit both?</p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="borneo, post: 520360, member: 34228"] Hello I’m new to the forum (posting on it anyway). I could do with some advice... Over the last 2 years I have been subcontracted (labour only) to commission solar PV systems. Often these are newbuild properties and when I get there the panels are already on and the DC cabling done. About half the time the inverter is downstairs next to the CU and so the DC cabling is routed in the plasterboard stud walls in flexible steel conduit and clipped every 40 cm. In some places this cable run is within 50 mm of the surface of the finished wall. The main contractor who is responsible for selecting and specifying this conduit was under the impression that it was sufficient mechanical protection as per reg 522.6.204 (iv) but I think this is wrong. I have mocked up the situation and done my own rudimentary test. The conduit deflects away from a nail or screw in between clips, but if it happens where the clip is, or where the conduit is otherwise held, then on the nail or screw will easily pass through. So, in order to asses the risks, my questions are - What are the risks from the DC cabling? What would happen if someone did put a screw or nail etc into one of the string cables? What would happen if they hit both? Thanks [/QUOTE]
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Green Renewable Energy Forum
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Flexible steel conduit as mechanical protection
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