Leakage in Electronic Appliance

How are you sensing the "leaked" current? If this is all AC, then your statement: "is it a common problem and how to rectify it?" is quite the pun

Test pen light glow a bit and sometimes we can feel small electric short when use hand touching the metal casing of CPU in Desktop and slot machines and all the them are powered by AC power supply. The test pen light not lited anymore when our hand touching the metal body of the machine if a ground cable is connected to the ground terminal of the machine. Thanks.

Found how?

Is the voltage between a good ground and the ground of the bad device about 1/2 the line voltage?

AC powered device , if made of metal housing, should have its external hosing earthed permanently for safety.

The fact you detect leakage is that it is not earthed.

Certain detectable leakage is not unusual.Without earthing, if you use a test pen and touch the metal casing , the test pen may glow a bit, the glowing is due to current flowing through the test pen and your body to earth. These leakage current is due to poor insulation. There is a certain limit to this leakage when it is considered not save. The safest and correct thing to do is to ensure earthing the metal housing is there and good !

Check for anti-parasites filters' condensers if applicable in the power supply. Most slots produce spikes that are normally filtered. (or completely blocked in the power supply)

Try moving to a Dollar slot machine and see if that ratifies the leakage? It maybe the machine's are programed to shock you until you satisfy the minimum dollar amount. Chic-Ching

Due to what is known as leakage, stray capacitance, etc., all electrically operated devices have and /or develops "leakage current". The amount and magnitude of any unwanted leakage current can only be minimized Not totally eliminated!!

The use of a properly designed, low leakage Isolation transformer will help you limit this unwanted leakage current into the micro-ampere range.

Yes, I think you are part of a common problem in commercial business whom don't have the luxury to unplug their appliances when not in use.

For manufacturing applications, check USON: they make Leak Test Equipment for all types of manufacturers in Automotive, Medical, Industrial, and other industries. This is the guy to call:

Bob Cromleigh

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