Re: Remember Mr. Bill's servo lite?

Forgive me of this has already been said, but my understanding of the voltage isolation issue is this:
If you compare a classic isolation transformer with a 1:1 turn ratio to a direct connection to the power line, both supply 110 VAC and you can get a shock from either or them.

Because the energy transfer in the transformer is through magnetic
coupling between the two electrically isolated coils the amount of current that the transformer can deliver is limited by the magnetic saturation of the transformer core. A 2 amp isolation transformer will only deliver somewhere in the vicinity of 2 amps. The power line, on the other hand, (or the input side of the isolation transformation for that matter) will deliver as much current as the power company can give you until the circuit breaker activates.

The Variac isn't isolated so you can get a lot more current through it that a regular transformer.

The isolation scenario works with step down transformers,too.

Chris

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@...> wrote:
>
> Hi Jeff:
>
> I appreciate the effort.
>
> But there are a couple of things that don't convince me still.
>
> For instance, to use your analogy, why is the "red" water more dangerous than the un-colored water?
>
> And I don't think it is correct to say beg to differ that you can't get a shock by touching a single wire from an isolation transformer. The chances are good that you will not get a shock, by completing a circuit to ground, but by no means absolute. The output of the "ungrounded" isolation transformer WILL have some potential with respect to ground-and you don't know what it is.
>
>
>
> Andy Wander
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jeffrey T. Birt
> Sent: Saturday, January 14, 2012 11:16 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Re: Remember Mr. Bill's servo lite?
>
> Sorry Andy, I'm really trying to be helpful but trying to explain this type
> of thing over email is not very effective.
>
>
>
>