[Amps] Source for plate xfrmer

[Al Kozakiewicz]

First off, NEC codes end at the outlet.  An amp is an "appliance" and would be covered by UL, which is entirely optional.  There is nothing that forbids such a practice - an electric range is a good example as the overn elements are typically 240v, while the burners, controls and lamps are 120v.

The issue is that a range uses a 4 prong outlet - 2 x hot, neutral and ground, while your typical amp/AC outlet is missing the neutral.  You may NOT connect your fan between a hot and the chassis ground, even though it would be electrically rational.  If the safety ground failed, the chassis would then be at 120v with respect to ground.

Al
AB2ZY

________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf Of TexasRF at aol.com [TexasRF at aol.com]
Sent: Tuesday, February 14, 2012 10:54 AM
To: km1h at jeremy.mv.com; ranchorobbo at gmail.com; steve at dx4win.com
Cc: amps at contesting.com
Subject: Re: [Amps] Source for plate xfrmer

I guess there is some electrical code that forbids connecting the 120vac
blower between one side of the 240ac line and neutral?

I hope this doesn't start another round of ground vs neutral wiring  sins.

73,
Gerald K5GW







In a message dated 2/14/2012 9:41:22 A.M. Central Standard Time,
km1h at jeremy.mv.com writes:

You can  get more benefit with primary taps and not bothering with a pair
of
120V  windings; use a seperate 120V line for blowers, LV supplies,  etc.

Tapping the secondary limits your KVA as you go to lower voltages  and who
the heck needs a CT in a big  amp?

Carl
KM1H


----- Original Message -----
From:  "Rob Atkinson" <ranchorobbo at gmail.com>
To: "Steve Bookout"  <steve at dx4win.com>
Cc: <amps at contesting.com>
Sent: Monday,  February 13, 2012 10:10 PM
Subject: Re: [Amps] Source for plate  xfrmer


> In addition EPD makes a good product but plan on  spending at least
> $400, perhaps more.
>
>  http://epd-inc.com/
>
> How much are you prepared to  spend?   Because of the price of copper
> any custom plate  iron you get that has some muscle is going to
> probably cost some  coin.  More if you want it potted and several taps.
> Even if you  don't need them if you are paying for a custom job it's a
> good idea to  get a CT on the secondary and of course one on the
> primary, plus a few  more taps on the secondary.   You may decide 4.25
> KV DC with  a cap input filter is a bit high, or if not, extra taps
> afford  different supply voltages and increase the versatility of the
>  transformer and its resale value if you ever decide to let it  go.
>
> 73
>
> Rob
> K5UJ
>
> On  Mon, Feb 13, 2012 at 12:35 PM, Steve Bookout <steve at dx4win.com>
wrote:
>> Hello all,
>>
>> Where do you look for a  new HV plate transformer these days?
>>
>> I understand  Peter Dahl is no longer around.
>>
>> I'm looking for 3000  VAC secondary @ 1+ amp CCS.
>>
>>  TIA
>>
>> 73 de Steve, NR4M
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