To many accounting queries on this forum...so lets get an electrical discussion going.
I need to install a 400 amp supply in a building ...miles away from the transformer....not really but hey... it sounds better.
We are going to upgrade the meter panel and fit a 400 amp circuit breaker in the panel with a private meter.
We going to install 2 x 110 mm pvc ducts under the road (distance 25 m)
up the side of the building exposed to direct sunlight for 4 m
onto a 200 mm MD cable tray which will run 100 m on the ceiling with the 2 cables space the width of the tray apart.
turn into the unit 6 m along the wall
then down into the unit another 10 m
into a floor standing 400 amp sub panel
is it gona be 2 x 95 mm x 4 core ecc or 2 x 120 mm ecc
a wild guess would say 2 x 95 mm should do it ...but because of the distance maybe the 120 mm sounds more likely ...but the fact that in is running most of the way on an open cable tray spaced ...we could get away with it.
the existing installation already has a 2 x 95 mm x 4 core cables ...but i dont believe they are suitable for 400 amps considering they run in a duct under ground 130 m 500 mm below the surface....they should be derated to 300 amps sounds about right.
what do you think?
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