[SOLVED] electricity leaks in cabinet

[vijay97]

while connecting pc directly to power supply(without ups) it leaks via cabinet.
while connecting with ups it won't leak
anyidea???

 

[kanewolf]

What country is this in? Two wire or three wire AC power cord?

 

[vijay97]

What country is this in? Two wire or three wire AC power cord?

Am from india
its an three pin link attached

https://5.imimg.com/data5/IK/FJ/MY-19019737/three-pin-plug-500x500.jpg

 

[vijay97]

What country is this in? Two wire or three wire AC power cord?

Am from india
its an three pin link attached

https://5.imimg.com/data5/IK/FJ/MY-19019737/three-pin-plug-500x500.jpg

 

[kerberos_20]

well then your wall power outlet isnt properly grounded than

 

[vijay97]

well then your wall power outlet isnt properly grounded than

i didn't understand ,if am using ups then y there is no leakage???

 

[kerberos_20]

https://www.youtube.com/watch?v=zLW_7TPf310

 

[Paperdoc]

I do NOT know how power is supplied to your house in India.
I live in Canada. Here the common system is that power comes to the house on three lines. Of them, one is Neutral and the other two are Hot, each 120 VAC from Neutral. Between the two Hot lines is 240 VAC. This is called a Grounded Neutral distribution system. But for this discussion, the important item is that here the Neutral line is connected to a true GROUND, both at the transformer supply end and at the breaker panel in the house. This establishes a reference point so that the voltage on the Neutral line is always the same as true Ground. Thus, power on each of the two Hot lines is at voltages higher than Ground, and any leakage from those lines through you to ANYTHING like a Ground will be experienced as a current flow.

However, when you use a UPS, its internal circuitry isolates the power output lines from the input lines. It DOES connect the Ground terminal of its output to the Ground line from the wall, because that's the easiest way to access a true ground from the UPS case. But for the two power output lines, NEITHER of them may be connected to Ground. That makes this a Floating Neutral system. so technically there is NO path for a return current from a true Ground that you might touch back to any part of the UPS's output circuits. No current path, no current flow, and you should not get a shock from the touching ONLY ONE LINE from the UPS output. Of course, if you were to contact BOTH output lines from the UPS you Would get a shock (current flow)!

So, OP, IF your electrical system there is like the one I have, that is why you do not get a shock from the UPS output. Now, the fact that you DO get a shock when the equipment is plugged directly into the wall outlet could be a few different things. One is, as suggested, that the house electrical system has a flaw. For example, the connection from Neutral to Ground may be poor. Or, maybe your system is not even supposed to use the Grounded Neutral design - I don't know. Another possibility is that at least one (maybe more) wall outlets was installed incorrectly and the Hot and Neutral slots of the outlet are reversed.

Another cause that certainly can and does happen here in our system is that one or more of the parts of your computer system is wired incorrectly. Some devices are made cheaply and connect the Neutral side of the power cord to the device's chassis, which is poor design. Depending on how the plug system on the end of the power cord is done, that means that is may be possible to plug in some devices "backwards" so that the power cord line connected to its chassis is actually plugged into the wall's Hot line. That can send electrical currents from the badly-made mis-connected device through some signal lines (which often assume that chassis is really Ground) to other parts of the system, resulting in electrically "live" external chassis parts. Here in North America we have changed our plug and wall outlet designs to prevent this if possible. With a 3-connection cord (that includes a Ground prong) there is only one way to plug in, so the problem is eliminated as long as the wires from the cord are connected to the correct prongs in the plug module. But the older plugs with only two flat blades of the same size could be plugged into 2-slot outlets right-way-up or wrong-way-up. The newer design makes those two blades of different widths (Neutral is wider) and the outlet slots are similarly different. Thus again there is only ONE way (the right way) to plug in this newer 2-blade design, even if you have no third Ground blade.

For that last possibility, you can investigate systematically. First disconnect all your devices. Connect ONLY the main computer to the wall outlet and turn it on. Check whether you feel any electrical charges on its case exterior. If you do, then either there is a flaw in the computer itself, or the wall outlet is flawed. If you get no shock feeling from that basic system, start connecting and plugging in one more device at a time, checking for electrical shocks for each added device. Somewhere in the process you may find a new device that causes the problem.