screwdriver tester

[Nobody]

On Thu, 11 Oct 2007 17:25:38 +0000, Rich Grise wrote:

But, as long as you're only touching the plastic part, you'll be OK -
the reason for the safety warnings is becase if one hand is grounded,
or you're standing in water, and your hand slips and contacts the HV
AC, it can kill you.

The point is to not give the current any path through yourself, but
like I say, the little neon testers should be OK, if you're only
holding the plastic part.

More specifically, the "one hand in your pocket" rule is intended to
prevent the situation where the "active" hand touches live while the
"spare" hand is resting on a grounded case, resulting in a relatively
low-impedance path which goes in one arm, across your chest (through the
heart), and out the other arm.

If the spare hand is out of the way when you touch live, the current faces
a relatively higher-impedance capacitive path, and most of it avoids the
heart.

 

[zhafran]

On Oct 12, 4:21 am, Nobody <nob...@nowhere.com> wrote:

On Thu, 11 Oct 2007 17:25:38 +0000, Rich Grise wrote:
But, as long as you're only touching the plastic part, you'll be OK -
the reason for the safety warnings is becase if one hand is grounded,
or you're standing in water, and your hand slips and contacts the HV
AC, it can kill you.

The point is to not give the current any path through yourself, but
like I say, the little neon testers should be OK, if you're only
holding the plastic part.

More specifically, the "one hand in your pocket" rule is intended to
prevent the situation where the "active" hand touches live while the
"spare" hand is resting on a grounded case, resulting in a relatively
low-impedance path which goes in one arm, across your chest (through the
heart), and out the other arm.

If the spare hand is out of the way when you touch live, the current faces
a relatively higher-impedance capacitive path, and most of it avoids the
heart.

It all make sense now.Thanks to Rich and Nobody and also the rest for
all the clarifications given. Really appreciate that.

 

[craigm]

sparky wrote:

On Oct 8, 11:19 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com
wrote:
pratikg...@gmail.com wrote:
when i stand on a wooden stool and touch a live wire i dont get a
shock because circuit is not complete with ground as wood is a
insulator but when i touch a screwdriver tester to that live wire the
bulb lights up even while i am standing on the wooden stool how can a
bulb light without getting earthing?

You're acting as a large value resistor. Enough current passes to light
the neon bulb without giving you a shock.

Graham

The wood is an insulator. The current flows through you because of
capacitance.

Depending upon the moisture content, wood may be a poor insulator.