Evening Steve,
>> Not to steal Wayne's thunder, here are my safety list for working
on any electrical circuit:
Of course not. How can anyone have too much safety.
>>At 02:21 PM 9/11/2008, you wrote:
I was aware of everything you said, ......... I simply did not deduct
that anyone here would be working with some of these things.
I have been shocked with 750 VDC. Only once, I did not stay
connected long, it knocked me all
the way across the room.
I would be more concerned with Capacitors as to being a potentially
fatal electrical component. Capacitors used in power supplies,
especially, can hold charges for long periods of time (weeks and
longer) even when the appliance is unplugged. Capacitors can even
after being discharged re-energize to be a shock hazard, potentially
injurious ones at that.
True indeed. I have some new capacitors, rated at 5000 V I
think, and others that are the largest I have seen, other than
coupling capacitors for power systems.
Likely you have seen them, Capacitor Rooms, ........ a room full
of capacitors that make your hair stand up, even at the door. Not
for the faint hearted.
You don't see Caps (as capacitors are sometimes called) in most
Colloidal Silver Generators; you will see them used in high voltage devices.
The Secondary windings on transformers are the next most dangerous
electrocution hazard (the device is plugged into an electrical outlet).
Many do not understand that, of course.
Now, ......... how many Step Down Transformers, with the
intended primary of 480 VAC,
have you seen, that was connected backwards ? The 480 was
connected to the secondary.
This made the turns ratio reversed. Instead of the 480 being
stepped down, it was in fact, stepped up.
That is a gosh awful situation. A man that worked for me, not as
knowledgeable as he should be,
tried to measure the output, .......... not knowing that the voltage
was several thousand volts.
Of course the meter melted down, and went up in smoke. The man was lucky.
Always beware of the people there before you.
I am personally more attentive (read afraid) of DC Voltages than
AC. AC can hurt you, but DC grips onto until you are good and end.
High Voltage, AC or DC, is best left to the trained professional.
I am not afraid of any of them. I did not say, ...... I have no respect.
I have high voltage probes, rubber gloves ( with leather on top of
the rubber ) and have serviced and calibrated high voltage test equipment.
I stand on a rubber mat, touch nothing with the power applied, and I
do discharge capacitors.
I connect services, with power on, directly from the pole. I did not
say I like to do this or that
I do it often. Only in rare cases, do I get backed into the corner.
A GFI (Ground Fault Indicator) outlet will trip with an AC fault or
short and provide some protection against AC (think hair dryer or
radio falling into a bathtub or sink), but a GFI provides no
protection against DC shorts or faults. (No AC fault to trip the protection)
You could have made the most important statement about them.
They offer protection from the Power Wire ( called HOT by some ) to
the neutral, but offer
zero protection from the power wire to ground. They could do
both. Not sure why they are not designed to do so.
I have installed many of these in mission critical applications. Yes,
I know the specifications of the devices.
Still, I built my own tester for GFCI's. Recorded the results of every one.
And I looked forwarded to the day in court when I could make some
attorneys look stupid.
I was READY !
Not to steal Wayne's thunder, here are my safety list for working on
any electrical circuit:
Be my guest ! <grin>
1. Do not work when you are Tired, Inebriated, or Upset.
2. Remove all jewelry, including wedding rings.
3. Wear Rubber Sole Shoes. (A rubber mat in addition is smart when
working on a cement floor.)
4. Have the device on a wooden or other non conductive workbench.
5. If you have long hair, tie it back
6. Never trust an on/off switch, unplug from the outlet..
7. If you have to reach into the device when it is plugged in, keep
one hand in your pocket. I also use rubber gloves (the thick type
used for washing dishes).
8. A chopstick is better than a hand in most instances to "poke"
around in the above case.
9. Wear Safety Goggles one soldering. Never Solder into a live
(plugged in) Circuit.
9. Never work when distracted (TV show, Nagging spouse or kids,
Talking on the Telephone).
Very good, very good indeed.
I could add one more..........
If you do not understand "Ohms Law", ........ "do not play with
Ohms Law gadgets"
But the most Important rule is:
10. If you don't have a clue what you are doing, stop and find
someone who does.
It is cheaper in the long run. (Funerals can be quite expensive.)
True indeed, but many will not do it.
Resistors and diodes threat vanishes (unless tied to a Cap) as soon
as the power chord is removed from the outlet. We use to joke
Resistors are more likely to be fatal if swallowed (choking hazard),
diodes likewise.
The first sentence is of course true. But most of my reference
and experience relates to device and circuits that are powered
up 24/7 for years at a time. That changes many things.
There is a big difference as we know, between Intermittent duty and
Continuous Duty.
That is another world and another book.
But I will proceed to prove, a resistor or a diode can blow up your
car, burn your house down,
kill you in many ways, crash an airplane, or sink a ship.
You would think I should say, "or the failure there of" but that
is not always true.
Normal ( or nearly so ) operation can be hazardous as well.
Again, thanks, and glad to see some other safety comments.
Wayne
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