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Old 05-16-2009, 08:28 PM   #16
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Unpolarised US Type 2 Plug to UK Plug.


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Originally Posted by hayewe farm View Post
I just believe that in this case there is no right or wrong. Having bought hundreds of transformers even ones with the same part number with different colored wires for the poles. There is no standard for the transformers.
You are right that there is no standard for the transformers, but there is a convention on which wire we switch and which one we send straight through. The hot live wire is connected to the voltage selector switch, and the grounded neutral goes straight in. Does it really matter from a physics standpoint? No, but it is best to follow the established convention for these kinds of things.

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Old 05-17-2009, 11:35 AM   #17
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Unpolarised US Type 2 Plug to UK Plug.


Hi Again

You're both being very kind in helping my out with this. Thank you so much.

I've kinda understood what you've been talking about. However, were you both assuming I had a plug with one pin wider then the other?

What I had on the unit was a 2-pin unpolarized Type A plug (both pins exactly the same size). Here's a pic:



As it stands (with the unit working fine), it appears my Neutral wire (in the unit) is wired to Live in my UK plug and that the Live wire (in the unit) is wired to Neutral in my UK plug.

Am I being advised to change yhe wires in my plug around for piece of mind to have adhered to convention?

And, on the other hand, not to bother?


Regards

R.
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Old 05-17-2009, 12:09 PM   #18
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Unpolarised US Type 2 Plug to UK Plug.


InPhase277 is suggesting you rewire to follow convention my point is it will have no detriment effect wired either way and not affect the operation. It's your unit so it's entirely up to you. The discussion has to do with point of view rather than safety or function. If the unit was much older, say 1950 or older, it would be important because it was common to bond one line to the chassis.
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Old 05-17-2009, 12:25 PM   #19
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Unpolarised US Type 2 Plug to UK Plug.


Quote:
Originally Posted by InPhase277 View Post
You are right that there is no standard for the transformers, but there is a convention on which wire we switch and which one we send straight through. The hot live wire is connected to the voltage selector switch, and the grounded neutral goes straight in. Does it really matter from a physics standpoint? No, but it is best to follow the established convention for these kinds of things.
If it was an on/off switch I would agree. However there are production and service advantages in wiring voltage selector switches to the grounded conductor. The terminals do not need to be heat shrinked or insulated which cuts production costs and allows for easier replacement. Both conductors in this type of application are considered straight through.
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Old 05-18-2009, 09:49 AM   #20
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Unpolarised US Type 2 Plug to UK Plug.


Hi Again

I just want to thank you both for your help here. You've both been very supportive.


Thanks again. Much appreciated.

R.

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