Trevor Wilson wrote:

"Tov" wrote in message
...
I appreciate that this will of course vary from manufacturer to
manufacturer, but in general terms can someone give the approximate
voltage? I'm curious because I'm getting a "glow" from the outer
metal casing of a SCART lead connector on several pieces of
equipment.

**Depends on the screwdriver. One of mine starts at around 12 Volts.
However, it is an LED, powered type. The usual, neon types start at around
65 Volts. It's not unusual to detect minute leakage currents from domestic
equipment. Disconnect everything and test separately. You'll probably find
it'll be the antenna. Some US equipment has a resistor from neutral to
chassis. If this has been mis-wired or there is a fault elsewhere, you'll
get leakage from that too.

Add to that the fact that most switching PSUs contain Y capacitors for EMI
suppression that also cause a leakage current to ground. If the equipment is
ungrounded, such parts can rise in voltage to around half the supply voltage
if measured into a high impedance. The leakage current is quite low however,
typically under a hundred microamps..

Graham