AS/NZS 3000:2007 - 3.9.4.4 (a)
Posted: Thu Nov 11, 2021 10:43 pm
I've come across some 'un-tradesman like' wiring in a new house that I'm pre-wiring.
The Solar installers have installed their PV Panels and have run 2 DC Strings (which are also hanging out unterminated through a flush box LIVE - 270VDC on each String, but thats a seperate issue) in a HD-T Solar Flexi Conduit from the roof penetration to their inverter Location by fixing (with saddles) to the UnderSide of the Roof Purlin (less than 50mm from the face of the supporting member to which the roofing material is attached). Which then triggers Clause 3.9.4.4.
So my question is - Does HD flexi Conduit satisfy (a)? I feel it doesn't. In my opinion a Roofing screw would have no problem screwing straight through an HD conduit thats fixed into place. Particularly if they decided to use longer screws as they usually seem to do when re-roofing. (b) Doesn't come into play as its a non conductive PVC and I doubt they have an internal Earthed screen within the Conduit. (c) won't help because the cables are straight from the Array and won't (as far as I know) have 30mA RCD protection
I'd be keen to see what everyone thinks
Thanks
The Solar installers have installed their PV Panels and have run 2 DC Strings (which are also hanging out unterminated through a flush box LIVE - 270VDC on each String, but thats a seperate issue) in a HD-T Solar Flexi Conduit from the roof penetration to their inverter Location by fixing (with saddles) to the UnderSide of the Roof Purlin (less than 50mm from the face of the supporting member to which the roofing material is attached). Which then triggers Clause 3.9.4.4.
So my question is - Does HD flexi Conduit satisfy (a)? I feel it doesn't. In my opinion a Roofing screw would have no problem screwing straight through an HD conduit thats fixed into place. Particularly if they decided to use longer screws as they usually seem to do when re-roofing. (b) Doesn't come into play as its a non conductive PVC and I doubt they have an internal Earthed screen within the Conduit. (c) won't help because the cables are straight from the Array and won't (as far as I know) have 30mA RCD protection
I'd be keen to see what everyone thinks
Thanks