[Amps] More on two pin 220vac

[Louis Parascondola]

It's been years since the NEC has banned ANY normal current to flow on the ground of the electrical system except fault current.  The Ameritron amp in question does not reference any voltages to ground. or to neutral for that matter.  Therefore as long as there is 240v between the primaries of the plate and filament transformers the amp should perform fine with the 2 wire system.  I repeat my concern is that there is no bonding to ground but then again there is no ground unless one is provided externally to the chassis and perhaps a water pipe.  I would assume that the electrical delivery system should be grounded at some point.



-----Original Message-----
From: Jim Brown <jim at audiosystemsgroup.com>
To: amps <amps at contesting.com>
Sent: Tue, Oct 15, 2013 2:21 am
Subject: Re: [Amps] More on two pin 220vac


On 10/14/2013 6:16 PM, Charles Harpole wrote:
> Sorry to belabor this some, but if we read Mr.  Parascondola's first message 
about the presence of voltage inside some Ameritron amplifiers, he seemed to say 
that it did matter which side of the hot and neutral of the two-wire supply 
220ACV was connected to the amplifier AC input.  Does it matter?

IF, AND ONLY IF, the power transformer primary has no connection to the 
chassis, it does not matter.  If one side of the power transformer 
primary IS connected to the chassis, it matters a LOT -- someone could 
get killed. The way that could happen is if the plug was inserted with 
hot to the chassis, which puts 220V between the chassis and ground.

In my previous post, I suggested that the person with the problem open 
up the amp, give it a careful visual inspection, and carefully check 
with an ohmeter to make sure that nothing around that power transformer 
primary goes to the chassis.  I repeat that suggestion.

This is not brain surgery, this is stuff that is General Class license 
stuff.

73, Jim K9YC
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