[TriEmbed] Inexpensive 120V (15A) to 240V (7.5A) transformer?

kschilf at yahoo.com kschilf at yahoo.com
Mon Apr 11 22:14:19 CDT 2016


Hi Phil,
I don't know what Shane has in mind, but that is an interesting idea about using two receptacles; although, Mr. Murphy will probably ensure that opposite phase receptacles will be several feet apart as you note.  :-)
Why not just add a two pole, 240V circuit breaker assuming you have space in the panel and can reasonably run wire from your load to the panel?
BTW, I think there may be a typo in your email, should be:
AWG 10 -> 30 AAWG 12 -> 20 AAWG 14 -> 15 A
To anyone reading this post, same impedance at twice the voltage = 4 times the power delivered.  Please be careful and consult a licensed electrician if in doubt.
Sincerely,Kevin Schilf
   
   From: Phil Smith via TriEmbed <triembed at triembed.org>
 To: Shane Trent <shanedtrent at gmail.com>; TriEmbed Discussion <triembed at triembed.org> 
 Sent: Monday, April 11, 2016 6:59 PM
 Subject: Re: [TriEmbed] Inexpensive 120V (15A) to 240V (7.5A) transformer?
  
If you can find outlets close to each other whose hots (x and y) are from adjacent circuit breakers, then you could combine x,y, and g (ground) using two plugs to get 240V, although the outlets are likely only rated at 120V, 15A (14 AWG wire).  Another way of looking at it is x=+120V, y=-120V (relative to Neutral n here n ~= g except at high current draw.  Often wiring within a single residential room is from a single circuit breaker.  Interestingly, the National Electric Code (NEC) rates 10, 12, and 14 AWG wire at 15,20, and 30 amps no matter how long the wire is, analogous to the state of SC once legisilating the value of pi to be exactly three.  AWG<10 wire is not subject to this arbitrary amperage and equations for resistance and reactance are used instead.

Phil
 

    On Monday, April 11, 2016 5:16 PM, Shane Trent via TriEmbed <triembed at triembed.org> wrote:
 

 Hey all!
I am looking for a transformer to setup 120V up to 240V. I recall seeing a transformer company at the Hamfest last year but do not remember the name. Can anyone recommend a vendor? Does not have to be a high-end design. Is powering a charging system that corrects for variations in line voltage.
Thanks for any suggestions!
Shane
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