Temporary power generation

Following a local cut in supply, UK Power Networks installed a temporary
generator (about half the size of a large container) at the local
substation. There were 5 identical orange cables (about 25 - 35 mm in
diameter) running from the generator to the substation.
Why 5? I had assumed 4 were the 3 phases and neutral, but if that was
the case, what was the other one for?
Reply to
Jeff Layman
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GROUND.
Reply to
Michael A. Terrell
Thanks. Why isn't the steel armour of the live/neutral cables used for the ground?
Reply to
Jeff Layman
It can't handle the full fault current.
Reply to
Michael A. Terrell
Singles can't have steel armour - unbalanced magnetic field inside. If they need a metalic sheath, it's a copper mesh, but those cables probably don't have any earthed sheath as they aren't expected to be used in location where that's needed. They'll just be double insulated single core flexes.
Reply to
Andrew Gabriel
The generator (500kVA) was disconnected today. There were four 30mm diameter cables, but the fifth, which had been partially covered by the others, was in fact only 15mm. It was connected at one end by its ring to a clamp and 1200mm x 12mm earth rod.
Reply to
Jeff Layman

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