Star or Delta?

[normspanners]

This is the way I see it as regards the US and UK
the first drawing is US household
the second is US light ind
the third is US heavy ind AND UK but should be 415 not 480
so the welder can be wired to suit either the second without the neutral or third but in UK it should ONLY be wired as per the THIRD method
PS dont know why there is a four image. I was trying to find an image with 415 between phases

Also known as an Edison system, split-phase or center-tapped neutral. This is the most common residential service in North America. Line 1 to neutral and Line 2 to neutral are used to power 120 volt lighting and plug loads. Line 1 to Line 2 is used to power 240 volt single phase loads such as a water heater, electric range, or air conditioner.

The most common commercial building electric service in North America is 120/208 volt wye, which is used to power 120 volt plug loads, lighting, and smaller HVAC systems. In larger facilities the voltage is 277/480 volt and used to power single phase 277 volt lighting and larger HVAC loads. In western Canada 347/600V is common.Used primarily in industrial facilities to provide power for three-phase motor loads, and in utility power distribution applications. Nominal service voltages of 240, 400, 480, 600, and higher are typica

 

[madkayaker]

I tend to disagree spark plug that most kit has a transformer to make 240v. 230v is not that common a voltage in 3ph industrial kit. If a machine needs a neutral than it's wired for one from supply. 110v is a common voltage used for control voltage and that uses a 400v to 110v transformer across two phases. Neutral generating transformers are available but tbh have never come across one and I spend lots of time inside lots of different machines!

 

[Robotstar5]

I worked on an Italian spin riviter that was supplied by 3P (no neutral) and they had a 415-230 transformer inside to supply the machine lighting. The 230 was floating (no reference) as I found when trying to identify the neutral when replacing the light fitting!.

 

[madkayaker]

Bet that's fun!

 

[normspanners]

Could someone confirm my thinking that the welder would NOT be wired 240v 3ph in UK (3 wire system)
and that if connected 415v 3ph whilst linked 240v it will possibly blow PCB

 

[Spark plug]

I tend to disagree spark plug that most kit has a transformer to make 240v. 230v is not that common a voltage in 3ph industrial kit. If a machine needs a neutral than it's wired for one from supply. 110v is a common voltage used for control voltage and that uses a 400v to 110v transformer across two phases. Neutral generating transformers are available but tbh have never come across one and I spend lots of time inside lots of different machines!

I'm just going off my experience the machinery I work on everyday has at least one, and I've seen it on other machinery too. I also agree that 110v is also common in industry.

 

[Spark plug]

Could someone confirm my thinking that the welder would NOT be wired 240v 3ph in UK (3 wire system)
and that if connected 415v 3ph whilst linked 240v it will possibly blow PCB

Yes that's correct.

 

[Fintray]

Thanks I dont quite follow 'the converted from 240v SP bit'
quote]
Norm ignore that as I'm thinking of a motor.

 

[shenion]

3-phase is stated as the voltage between the phases. So in the UK it is 415V. Yes, each leg is 240V from neutral, but that is not important and besides, most 3-phase devices do not use a neutral.

The welder should be set at 415V.

Here for small industrial use, 3-phase is most commonly 208V with 120V to neutral. There is also, 220, 240, 380, 480, 600 and other voltages.
Also, for residential here, 3-phase is usually not available as the street will most likely be only single-phase power.

Also, note welder may be single phase and run off a 3-phase power. All AC/DC transformer TIGs are single phase. My Airco has settings for 208, 220, 380, 480 and 600V. I use 220 single-phase to power it.

My Miller MIG is a 3-phase machine. Older versions used star-wired transformers, newer ones used delta. The jumper settings are the same either way; you set it for the line-to-line voltage.