Current leakage om CNC

[Ian PParticipant @ianp]

Answer to last part of your question is yes.

Ian P

[John HaineParticipant @johnhaine32865]

It isn't earthed. It should be. Ideally, if the cable that has a 2 pin plug has an earth wire, change the plug to a normal one and connect the earth.. If not, change the cable. Can you post a photo of the cable and the plugs (on each end, if it's that type of cable)?

[Ian PParticipant @ianp]

I'm sure I and others may have already asked, but what are you measuring with and what two points are you actually touching the probes on?

Table of machine is one I can understand but what are you calling earth?

Ian P

[Ian PParticipant @ianp]

Unless the machine is manufactured to double insulated standards (unlikely for a machine tool) than there should be low resistance wiring between the machine frame and the earth pin of the plug,

Full stop, that's it, nothing else matters.

Ian P

[nigel jones 5Participant @nigeljones5]

Im using the earth of the 240v socket – there is no earth pin of the plug, hence my concern.

[Stuart BridgerParticipant @stuartbridger82290]

This a a downright dangerous and potentially lethal situation,

Two pin plugs are designed for double insulated equipment, where there are two independent functional levels of insulation that prevent contact with anything that could come into contact with live components. One of these is typically a plastic case. The fact that a machine tool has exposed metal means that it can never meet this criteria.

It needs to be properly earthed, end of….

Edited By Stuart Bridger on 12/09/2019 14:57:34

[Ian PParticipant @ianp]

I agree with Stuart absolutely.

How has this thread become so long before we find out the machine has a two pin plug, also how do you put a 2 pin plug in a normal 13A socket?

Ian P

[JasonBModerator @jasonb]

Post a photo of the 2-pin plug.

Some do have an earth but not a pin such as this if you are running it via some sort of adaptor the earth may not be making contact.

 

Edited By JasonB on 12/09/2019 16:07:40

[nigel jones 5Participant @nigeljones5]

nope, defo no earth. I will be adding chassis earths and converting to twin and earth 3 pin plug.

[Ian PParticipant @ianp]

Please Fizzy put us out of our misery and explain how a two pin plug was fitted in the first place.

If this was a machine you bought then for the sake of safely potential buyers others should be alerted.

Ian P

[JasonBModerator @jasonb]

Here you go Ian, from another post. China via Germany hence what looks like a german 2 pin earthed plug like I posted photo of.

Fizzy if this is being used for business then check it has proper CE and testing as your insurance will probably be void if it or you go bang

Edited By JasonB on 12/09/2019 17:31:36

Edited By JasonB on 12/09/2019 17:34:12

[john fletcher 1Participant @johnfletcher1]

OK about bonding and earthing, but where is the electrical leakage originating from, that needs eliminating. Testing with a simple continuity tester is not good enough, PAT testing we go a long way to proving the earthing is effective or now as it known as the CPC circuit protective conductor.

[Ian PParticipant @ianp]

With failing memory I dont recall seeing any links or references in this thread to the actual machine, regardless though, the German supplier should have supplied the correct cable for the destination country.

Ian P

[Mike PooleParticipant @mikepoole82104]

Some of the travel adaptors on the market make no provision for the earth connection, much equipment does not use an earth but it is essential to connect it if required. One of the most dangerous things around is a 2 core extension cable intended for double insulated garden equipment. At an event in our village someone turned up with a 2 core extension to supply the stage back line and PA for a band, lucky I was there and vetoed this cable.

Mike

[JasonBModerator @jasonb]

It was another thread, your memory is OK.

E-bay photo shows it with the typical power lead socket you see used on computers so could just plug one of those in and see if the earth is connected. But as John says pluging into mains with leakage may just trip something and should be properly tested.

[nigel jones 5Participant @nigeljones5]

Ian – it was bought off ebay from China, not a great starting point I know but there are a lot of them used in the UK and apart from me being electrocuted how they make them for the money they charge is anyones guess. Ive now earthed it and it shows varying but very low volts and almost zero amps so its going in the right direction. Nothing tripped and ours is a new house. My mate forced the two pin plug into a uk 3 pin socket – I never even saw it or gave it a thought until you kind lot prompted the questioning so big thanks to one and all.

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