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Waveform/wavecon cable sizing

Will Elec

Just had a quote in from Western Power for a new 100a 3 phase supply. There is approximately 100m between the pole mounted transformer and the cut out and the DNO has specified 185mm wavecon cable.. this seems like an overkill to me, the pole transformer is 50Kva and it seems like 95mm would be more appropriate!  Not sure what voltage drop on waveform cable is like but compared with regular SWA 95mm still seems plenty big enough.. Thoughts on this would be appreciated! Thanks




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    A 50 KVA transformer is probably sufficient for one 3 phase 100 amp supply, despite this being about 72 KVA . It is unlikely that the full 72 KVA would often be demanded other than briefly.


    A 100 amp three phase supply would allow for three electric showers AND 3 EV chargers AND plenty of lighting and small power circuits.

    And if significant electric heating is involved, then a 50 KVA transformer could probably be loaded to 72 KVA long term in UK winter conditions. 72 KVA of air conditioning on the hottest day of the year in a warm climate might end badly.

    My misgivings were presuming an EXISTING 50 KVA transformer with significant load already existing.
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    A 50 KVA transformer is probably sufficient for one 3 phase 100 amp supply, despite this being about 72 KVA . It is unlikely that the full 72 KVA would often be demanded other than briefly.


    A 100 amp three phase supply would allow for three electric showers AND 3 EV chargers AND plenty of lighting and small power circuits.

    And if significant electric heating is involved, then a 50 KVA transformer could probably be loaded to 72 KVA long term in UK winter conditions. 72 KVA of air conditioning on the hottest day of the year in a warm climate might end badly.

    My misgivings were presuming an EXISTING 50 KVA transformer with significant load already existing.
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