[Amps] 240V Outlet

[David C. Hallam]

I have never looked into the problem but reconfiguring the Invader 2000 
to lift the neutral off the chassis might be a major effort.  It uses 
two separate power supplies on interconnected chassis.  The supply for 
the 200 watt exciter section is a separate PS with its 120V supply 
derived from a outlet mounted on the HV chassis.  It was made this way 
because the Invader was supplied in two versions; 200W and 2000W.  The 
200W version could be user converted to the 2000W version by removing 
the 200W PS from the cabinet and mounting it on the 2000W PS chassis and 
simply plugging the line cord into a chassis mounted outlet.  In the 
cabinet space where the 200W PS was removed a complete amplifier chassis 
with a pair of PL-175's was installed.  In both the 200W version and the 
2000W version, the exciter section is connected to 200W PS by an 
external cable.

David
KC2JD/4

Carl wrote:
> ----- Original Message ----- 
> From: "Martin A Flynn" <maflynn at att.net>
> To: "Paul Christensen" <w9ac at arrl.net>
> Cc: "AMPS List" <amps at contesting.com>
> Sent: Sunday, August 09, 2009 4:28 PM
> Subject: Re: [Amps] 240V Outlet
> 
> 
>> Paul Christensen wrote:ice.
>>>>    * To oversize the wire by at least one gauge size (on a 20 amp
>>>>      circuit, use #10 wire instead of the #12) to address potential
>>>>      voltage drop issues.
>>> It's been a while since I've reviewed that section of the NEC, but I
>>> suspect over-sizing the wire size is fine, but I would never oversize
>>> the breaker current rating, nor would I over-size on the receptacle
>>> and plug.  In the latter case, I've seen instances where a 20-amp
>>> 120VAC receptacle is used, but the conductors are sized at #14 AWG.
>>> Looking at the receptacle gives the incorrect impression that the
>>> branch is rated for 20-amps, when in fact it's only rated at 15-amps.
>>> The breaker rating, wire size, receptacle and plug should all match
>>> the intended current-carrying capacity.
>> Paul,
>> The breaker and  device are the same rating.  My comment was to state
>> that his recommendation was to make the conductors and ground one wire
>> gauge larger then NFPA 70 states it should be.
>>
>> Martin
>>
> 
> That only makes sense if the I*R drop is excessive. Since the Invader 2000 
> is only going to draw about half the ratings of #12 wire, then going to #10 
> makes little sense on a basement long run. Going to #10 requires all 
> different plugs and outlets and the cost about goes thru the roof compared 
> to a 20A feed.
> 
> I wouldnt bother with a 4 wire feed either. Simply reconfigure the PS to 
> conform.
> 
> My amp repair shop runs #12 and so does my station. The shop gets many amps 
> that easily run 2500W out and some a lot more, and the 240V drop is minimal.
> 
> Of course if money is no object then all bets are off.
> 
> Carl
> KM1H
> 
> 
> 
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