2 PHASE supply to machine

[Lucien Nunes]

I never said it was a single phase supply or single phase system, honest guv! I only said this of the machine, so I'm not contradicting any definitions. If you had a 230-400V single-phase step-up transformer, you could power the machine from a 230V single-phase supply. If, instead you power it from two lines of a 3-phase supply, that does not suddenly make it a polyphase load, even though the supply is polyphase. I had thought that mentioning this would clarify how it could function without a neutral, but the logic might have got buried in the following dialogue!

AFAIK 2-phase was popularised by Westinghouse in the early days.

L

 

[mike the sparky]

Thanks to all for your replies. Thanks to Tony for his Codswallop Award. If I am correct, the reason for this forum is to discuss and help fellow electricians with their day to day work. All I have seen is who's got the biggest phase combination. As for my spelling, I will try and get my teacher pal to check each of my replys/replies?????? The reason for the post was to get further information on wiring of. Thanks to Darkwood, yes the EICR does finish at the isolator but surely a competent electrician would question something that was not the norm. In all aspects of life there is room for growth and learning. Nobody ever knows everything, apart from my wife! As long as the PUB MEMBERS are providing us mere mortals with this wonderful information I'm sure all will be well. You can go and have a chat about me in your club now! Hopefully \I can join you one day, as I am partial to a pint or 3.

 

[shanky887614]

it is reply for single as in single phase
or replies as in polyphase for more than one

 

[Knobhead]

Many machines will have a 415V 2Ph supply, not many will utilise the neutral. I just can’t understand why you are knocking yourself out over this?

In years to come you will find many supplies like this. Don’t worry about them. 95% of them would have been installed by someone that actually knows what they are doing.

 

[Darkwood]

Thanks to all for your replies. Thanks to Tony for his Codswallop Award. If I am correct, the reason for this forum is to discuss and help fellow electricians with their day to day work. All I have seen is who's got the biggest phase combination. As for my spelling, I will try and get my teacher pal to check each of my replys/replies?????? The reason for the post was to get further information on wiring of. Thanks to Darkwood, yes the EICR does finish at the isolator but surely a competent electrician would question something that was not the norm. In all aspects of life there is room for growth and learning. Nobody ever knows everything, apart from my wife! As long as the PUB MEMBERS are providing us mere mortals with this wonderful information I'm sure all will be well. You can go and have a chat about me in your club now! Hopefully \I can join you one day, as I am partial to a pint or 3.

Dont add the paranoid trophy to your collection here ... forum rules means we cant discuss other members behind their back well in a negative vein anyway and unless you see something obviously dangerous with the machine like exposed live parts etc then ensure your customer knows where your EICR starts and ends..... whoever connect the machine up will have the responsibility of ensuring the the machine is connected correctly and is safe to use.....

Don't dig the hole you are stood in too deep that you can't climb out

 

[SKY]

I have fitted quite a few 2 phase forklift truck chargers - the first one I ever did made me think for a while!

 

[GLENNSPARK]

Seen welders that a 400v 2 phase.

stick plant

 

[Knobhead]

Not just stick plant.