Wiring 3 phase?

[Sump]

I am guessing this isn't a DIY job but worth checking just incase it is hideously simple.

I have a 3 phase polisher running some 5m away from my car lift. As we don't really use the polisher that much anymore is it possible to connect my 3 phase lift to that polisher socket?

Is it a simple case of running some 4 core armoured wire from the lift to the socket?

Only issue is I don't have much of a grasp on the 3 phase electrics wiring from the control box as this is what it looks like...

[netherfield]

I take it that is the control for the lift, it needs power to terminals L1 L2 L3, and earth to the provided.

It's not possible to see where you intend to pick power from in your picture, is there a wall socket nearby?

[Sump]

Sorry no, I have a 3 phase socket hooked to a polishing machine nearby. Polishing machine is now redundant so I am planning just taking some cable, wiring it to a 3 phase plug, wiring other end to the lift and plugging it into that polishing machine socket.

[Sump]

My issue is the socket I currently have is 5 pin.

The ramp is the older style l1 l2 l3 and no neutral and goes with 4 pin.

surely you can wire this to the 5 pin but what do you do about the earth side of it ?

[essayer]

Doesn't that mean one is "wye" and the other "delta"?

[netherfield]

http://www.lewden.com/sites/default/files/2011_wat...

If it looks like one of these on page 4 then the large pin is for the earth.

[Sump]

Ah yes but where does the earth connection go into the lift box ?

[netherfield]

Same place as the other green/yellow

[Sump]

Well thats not hard then.

4 core cable



Red L1
Yellow L2
Blue L3
black earth at top of box with green/yellow


On the 5 pin plug, hook up L1 L2 L3 and Earth and leave neutral out.

[Redler]

Before you connect up to the terminals straight away you will need to check how the three phase lift motor needs to be wired.

Does it have;

A 'starter', if not is the motor required to be wired in 'star' or 'delta'?

[Ganglandboss]

essayer said:

Doesn't that mean one is "wye" and the other "delta"?

No. It means one is three phase and one is three phase and neutral. A three phase induction motor still has three wires irrespective of whether it is star or delta ('wye' is not the usual term). Star/delta refers to the configuration of the motor windings and is changed by the pattern of the links in the terminal box. You can get a star/delta starter where the motor starts in star configuration, works up to speed and switches to delta. This type of starter is used for larger motors and rather than using links in the motor, it has an extra contactor in the starter and six wires (plus earth) between the starter and motor. The OP's starter is a simple DOL though.

OP - this is a straightforward job to an electrician. It should be easy to get it to work but I recommend you get somebody who can assess the general condition and safety of the installation you wish to connect to and the equipment itself. I would be tempted to change the starter as the overload relay and controls wiring looks a bit shabby. The part should cost about £60 plus fitting.

[Solitude]

Sump said:

Well thats not hard then.

4 core cable



Red L1
Yellow L2
Blue L3
black earth at top of box with green/yellow


On the 5 pin plug, hook up L1 L2 L3 and Earth and leave neutral out.

With out trying to sound like a health and safety numpty........

are you sure about posting 3-phase wiring advice to someone who clearly does not understand it ?

[Sump]

Solitude said:

Sump said:

Well thats not hard then.

4 core cable



Red L1
Yellow L2
Blue L3
black earth at top of box with green/yellow


On the 5 pin plug, hook up L1 L2 L3 and Earth and leave neutral out.

With out trying to sound like a health and safety numpty........

are you sure about posting 3-phase wiring advice to someone who clearly does not understand it ?

I thought Sump was the OP?

[PHuzzy]

Sump said:

Well thats not hard then.

4 core cable



Red L1
Yellow L2
Blue L3
black earth at top of box with green/yellow


On the 5 pin plug, hook up L1 L2 L3 and Earth and leave neutral out.

Please just get an electrician to do it for you. For the sake of £100ish it's not worth any fk ups on your part. (Not implying you will)

[tex200]

Does the supply for the polisher have an RCD fitted?

Your plan of L1,L2,L3 & Earth will most likely come unstuck if it does.

[Ganglandboss]

tex200 said:

Does the supply for the polisher have an RCD fitted?

Your plan of L1,L2,L3 & Earth will most likely come unstuck if it does.

Why?

[tex200]

Ganglandboss said:

tex200 said:

Does the supply for the polisher have an RCD fitted?

Your plan of L1,L2,L3 & Earth will most likely come unstuck if it does.

Why?

Well in my experience, from when we have motors at work, the lack of a neutral means we have to by-pass or remove the RCD at the main distribution board to avoid the supply tripping out at inconvenient moments.

I'm in no way an expert but this is what we have had to do on several occasions.

[netherfield]

tex200 said:

Well in my experience, from when we have motors at work, the lack of a neutral means we have to by-pass or remove the RCD at the main distribution board to avoid the supply tripping out at inconvenient moments.

I'm in no way an expert but this is what we have had to do on several occasions.

Lack of Neutral is not your problem. we ran dozens of motors without any issues.