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@contesting.com [amps-bounces@contesting.com] On Behalf Of
TexasRF@aol.com [TexasRF@aol.com]
Sent: Tuesday, February 14, 2012 10:54 AM
To: km1h@jeremy.mv.com; ranchorobbo@gmail.com; steve@dx4win.com
Cc: amps@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@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@gmail.com>
To: "Steve Bookout" <steve@dx4win.com>
Cc: <amps@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@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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