I hold a milling domestic device 3 phase. 3 wires for phases,black indistinct and an loam. Wire it up to a 4 pole plug??
If the appliance is wired with a 5 core cable then it wishes to be connected via a 5 pole plug and socket. In europe they are specified as BS EN 60309-2 which replaces the old BS 4343 industrial plugs
see websitew below
A 5 pin plug and socket combination has pins for 3 phases plus a impartial plus an earth. Labelled R1/l1 S2/l2 T3/l3 then N and finally dust (this is the largest pin) Source(s): http://www.lewden.net/lewden/catalogue/1…
Since you use the residence "earth" you are most likely in Europe so you incontestably cannot use the earth as neutral so don't be guided by someone surrounded by the US where they have a problem distinguishing between the two.
Ideally you entail a 5 pin plug with neutral wired but nearby is a way around it. There must be some control power taken from one phase and neutral. You can buy a transformer (415/240v) and mount contained by it in, or adjacent to the piece of equipment. It will need to be fused. This shouldn't be a big cost especially compared to running a neutral if the panel is remote.
Three phase motors do not require a neutral connection. The electrical device could have some auxiliary equipment or an electronic motor control unit that requires a indeterminate, but that would probably mean that some component requires single phase power at the line to nonpartisan voltage. Since earthing conductors are not supposed to carry current, it would not be proper to connect the machine nonpartisan to the earth conductor, but the machine might work if you bring in that connection. For that to work, your three phase source would need to be supplied by a wye (star) source that have a solidly grounded neutral.
The best way to operate with the problem would to have an electrician or electrical technician examine the electrical diagrams for the contrivance or trace the wiring to verify what is required. If the neutral is required, a 3-phase supply next to a neutral should be installed. The machine may enjoy been intended to be installed with its own isolation transformer.
red,blue,and white are phases,black is common.
if the motor runs backward,swap any two phase connections.
green is dust ground