The talk of how CRT discharge wont kill you is not always true, It depending on the size
of the HV supply
and how stupid you are feeling at the moment of the SNAP.....
Many years ago, a very stupid Marine stuck a screwdriver in a radar display to discharge
the tube, with
power still on. He died and the screwdriver planted itself several inches in the
prestressed concrete bunker
roof. It turns out he had his other hand holding tight to the grounded chassis as he
leaned over to discharge
it.
This was durring Nam and I am sure that one moment of stupidity, just counted as one more
war related
death. I dont know for sure, but I heard later he got the putple heart for dying in
country. What I do know for
sure was that those of us still alive and on active duty, working in jobs that exposed us
to HV, got the lecture
and shown the pictures of the screwdriver. In hopes of reducing future losses, the one
hand rule, and red
flagging power, became strictly enforced.
Then there was the case when dangeling dog tags found a live circuit, he lived but took a
lot of crap from the
CO about willfull distruction of goverment property. Than again they gave me the same
willfull distruction
crap when I broke my foot, off duty playing football, untill I pointed out it was jarheads
vs squids and we did
win even though several people got a bit busted playing a friendly game of tag football
for beers and glory.
Many years later, while in a rush, with a customer waiting, I turned away from the bench
and monitor I was
looking at, to get a cliplead to discharge what I was thought was most likely a dead
monitor. What I did not
realize was one of the other guys I worked with come back from lunch saw the monitor on
the bench and
me walking away, he knew the customer was waiting and pluged it in to check it out, also
in a great hurry.
About the time I returned with the cliplead, he had turned to get the HV probe from the
other bench. Without
thinking I clipped up and the resulting flash and bang bunged up the end on my pocket
screwdriver and
seperated the wire from one of the clips on the cliplead. Thankfully my old training held
true and I had my
other hand behind my back where it belonged and not grounded. Oh, It shocked the shit out
of me all right,
but from the flash and bang followed by smoke, and the other guy screaming what the hell
are you doing!
not any electrical shock of and apreciable mesurement. I know... I should have seen the
power cord
plugged back in, but I had only turned my back for a minute or two... MyBad and I was
lucky ...
Play safe with CRT's and always follow the one hand rule when around HV keep the other
hand in your
pocket or hook your thumb in your belt, best somewhere in the back, and hold on.
Just my $0.02 on the subject ...
Back under my rock.
The other Bob