Subj : Light Switch Replacement
To   : Ed Vance
From : Barry Martin
Date : Mon Dec 16 2024 07:34:00


Hi Ed!

 EV> Barry, Thanks for the reminder about the one hand rule.
 EV> I ain't done any Electrical work lately.
 
You're welcome!  A reminder of the basics is always good as we tend to 
skip over those steps as get more proficient.  When I was working at the
store there was an AT&T troubleshooting video entitled "It Works Better
Whe You Plug It In"!!  It's true!  Wall wart comes loose from the wall, 
or someone uplugs because need the outlet temporarily....


 EV> Re: the one hand rule - I was in High School when the Teacher in
 EV> the Radio Electronics classroom show how to make sure it was safe
 EV> to work inside the 19" Rack Cabinet of the Kilowatt AM
 EV> Transmitter when it was disconnected from the AC Power Mains.
 EV> On the back of the cabinet was mounted a long metal rod that had
 EV> a wooden handle.
 EV> Where the rod met the handle a wire was attached that had a clip
 EV> on the end.

 EV> The Teacher showed us to open the jaws of the clip and fasten it
 EV> to the metal cabinet just after opening the door on the back.of
 EV> the cabinet.

 EV> Next he touched the Electrolytic Capacitor(S) to make sure they
 EV> didn't have a charge stored in them. I remember hearing a CRACK!
 EV> when the rod touched the first capacitor.
 EV> He touched each one several times and then said it was safe to
 EV> reach in to workon it with one hand in your pocket.

You don't want that CRACK! across your body!  The other thing is when 
working on CRTs discharge the anode -- IIRC a 1 meg resistor to 
resistor to slowly bleed off.  Then keep the resistor on while working 
inside as the current tends to regenerate.

Here's another tip.  The switch to the light over my Electronics 
workbench also shuts off the power to the outlet strip.  Done, shut off 
the light, wnich also kills any power to whatever is plugged in - like a
soldering iron!  There is a separate always-on outlet, on purpose 
positioned a bit inconveniently as an additional reminder.

                     ¯                                 ®
                      ¯  BarryMartin3@MyMetronet.NET  ®
                     ¯                                 ®


.... Our mountains aren't just funny they're hill areas.
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