[Boatanchors] AC line plug polarity

[James Duffer]

You will probably get plenty of answers to this some may be more specific.  I would think that the hot line should go to the therminal that is switched, the neutral line to the terminal that has the .1 cap.  I am assuming that the wires continue on to the primary of a transformer.  Now if a third wire, ground (green wire is added) connect it to the chassis close to where it enters the set.  If the neutral (fused line) is connected to chassis then you need to relocate the fuse to the hot line (same as the switched line).  Also you would be connecting neutral to ground in a location other than at the entrance panel, which is a no-no according to the NEC so you may want to just leave it the way it was designed.

Regardless, let us know how you do it.  Good luck with your project.

73, Jim, wd4air


> From: barrie at centric.net
> To: boatanchors at mailman.qth.net
> Date: Mon, 4 Jan 2010 15:17:18 -0700
> Subject: [Boatanchors] AC line plug polarity
> 
> Hello:
> 
> I'm working on an old tube-type amplifier, in hopes of using it as a speech-amplifier.
> 
> The unit doesn't have a line cord.  It has a terminal strip that takes care of all the ins-and-outs.
> 
> It was built in the 1940s, so the AC in is just two terminals.  I'm thinking of placing a three wire cord on it so that the chassis is grounded.
> 
> Fortunately, I have a schematic which shows one side of the AC switched, and the other side fused.  Neither side of the AC is grounded, although the fused side has a .1 cap to ground after the fuse.
> 
> The question is:  Where should I place the hot and neutral wires?
> 
> 73, Barrie, W7ALW
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