[Boatanchors] 240V line

[Bill Abate]

I would not add a single transformer in series with on leg to get the 
240 you want.  The reason is you will not have balanced lines to the 
neutral.  One leg would be nominally 150 to neutral and the other 120.  
Chances are you would need the 28-34 transformer connected to the 
neutral.  A 208/240 step up transformer with center tap would be best 
unless the neutral is not connected anywhere in the equipment and never 
will be.

73,

Bill, K3PGB

On 4/12/2026 4:41 PM, KA2PTE via Boatanchors wrote:
> Turns out I relocated my shop to a building where there is a big GE 
> transformer inside near the breaker panels
> taking 480/273 3 phase and knocking it down to 208.
>
> Not quite enough for my needs , I need about 240 so another ham 
> sugguested
> to take the 208 and put another transformer in series with it, perhaps 
> one thats 28-34V
> on its secondary to bring it up to 240 but make sure the secondary 
> current is rated the same
> which is about 20A I guess and it should be fine.
>
> Any ideas where to locate something like that?
>
> Other hams said to use a buck boost transformer (cheaper) else a 273 
> to 240
> step down (more expensive)
>
> -- 
> Steve Hearns [ KA2PTE ]
> Technotronic Dimensions [USA]
> WWW.TECHNOTRONIC-DIMENSIONS.COM
>
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