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Cable derating for cantinary wire AS/NZS 3008
Posted: Mon Jun 22, 2020 3:01 pm
by JamieP
Just looking at 3.5.2.2 (c) of 3008
Is this saying derating need not apply to cables on cantinary wires?
Re: Cable derating for cantinary wire AS/NZS 3008
Posted: Tue Jun 23, 2020 9:29 am
by AlecK
No.
Being on catenary makes no difference to the fact that the cables are still bunched. They are certainly not "installed unenclosed under the conditions and circuit arrangements depicted in Fig 1"; because Fig 1 is all about spacing, bith between conductors and between groups of conductors. It's not practicable to maintain the Fig 1 spacings on catenary.
Re: Cable derating for cantinary wire AS/NZS 3008
Posted: Tue Jun 23, 2020 10:04 am
by JamieP
Oh right, that makes complete sense, I thought it seemed odd. I can see what I had missed now.