"jacob" wrote in message
om...
What size flex 3 metres long for a 2.2kw 3 phase combi woodwork
machine?
What size cable to workshop (about 6 metres) to supply say max at one
time 6kw 3 phase machines?
Would this need to be armoured or just conduited or what?
Separate single phase elsewhere, but could I run a spur from a 3phase
wall socket to a single phase socket (same phase as other single
phase?) or is this against the rules?
I've got some sheathed and armoured 3 core cable. Does this need a
separate earth for 3 phase use, or do you earth the sheathing, or
both, or neither?

thanks

Jacob

Is this 3-phase installation at home ? Do you already have a 3-phase supply to the
property ? If you don't already have 3-phase, are you thinking of using a converter
from the single phase domestic supply ?

If you already have the right supply at the property, then it is best to make the
outbuildings a totally separate sub-mains supply from an isolator switch at the head
end. You will need to have the supply split to take this but it is will be worth it
for your own safety and convenience.

If you think you're only going to run up to 6 kW running ampage, then you'll need to
treble that amount to take the start up ampage of the motors on the machines all
running together. This will also allow for any strain on the working motors under
their normal use.

Taking all that into account, you're talking about a supply of 16 mm on each conductor
for the lengths you're talking about, and you may also have to double the neutral to
take the start up load until the motors are all running to speed.

With that supply it will allow you to run lighting and a few sockets from it as well.


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