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[Kevin Wood]

A friend of mine got a quote to have a 3 phase supply installed to power his 2 post lift. This is to a garage which has 3 phase on a pole the other side of a farm track, so not exactly challenging. I think they quoted £7.5k 

Needless to say, we spent £400 on an inverter to run the motor from a single phase supply and rewired the logic on the lift to suit.

In a domestic estate situation such a job would require the road to be dug up, so I can see it costing more than that!. The phases are only separated between you and your local substation (at the end of the road, in my case) so any fault upstream of that will kill the whole lot anyway.