My country does not have grounding system, How can I protect myself?

I live in Egypt where the neutral wire is grounded. The ground wire is not separated from the neutral wire. A wall outlet has two holes only (live and neutral), The third whole (ground) does not exist.

According to this question, I can NOT use neutral wire as a ground:

Why don't we use neutral wire for to ground devices and earth wire for closing the circuit?

So, How can I protect myself from the weak electrical shocks that happens when I touch the metal case of an electric device? Such as: The metal case of a personal computer or a washing machine.

I have one more question, What makes the shock too weak? I accidentally touched the live wire before and it was horrible.

If the live wire touches the metal case and then I touched the metal case, What makes the shock weaker? And If the live wire does not touche the metal case, What is the supply of the metal case? What causes the weak shock?

Thank you very much,

Replay

Usually the tingle you feel when touching an ungrounded case of a device is due to a capacitor (called a Y-cap, for EMI reduction) from the line to the case. This is a special safety-rated capacitor which will not allow a dangerous amount of current to leak onto the case. Nevertheless, the case is intended to be grounded so that you don't feel the tingle. You could connect the case to a grounding rod or maybe a cold water pipe.

For safety in the case of a live wire contacting an ungrounded case you could replace your outlets with ground fault interrupter type outlets. Then if you come between line (hot case) and some external ground you would be protected.

So, How can I protect myself from the weak electrical shocks that happens when I touch the metal case of an electric device? Such as: The metal case of a personal computer or a washing machine.

Start with an isolation transformer so that the "new" neutral and live are isolated. Connect the new neutral to earth at one point (distribution point or "new" fuse board) and wire this point also to a very solid gounding rod. Next use RCDs (GFCI in the US) for your power circuits.

Yes it's complicated but you asked!

As JohnD said - a GFI / ELCB (ground fault interupter / earth leak circuit breaker may disconnect the circuit when you feel shocks (depending on how much leakage is present, but with the system you describe this could be a major inconvenience.



I'm not suggesting that the following is sensible or practical or even safe - but it is a system that SHOULD work, but which is non standard and may violate local regulatory standards:

Provide a local ground with waterpipe or similar. This MAY exist already and MAY already be connected to neutral at your switch board.

Provide 3 pin appliance sockets with ground connection.

Extend ground as above to socket ground.

Fit appliance with 3 pin plug and cord and connect body to ground wire.

Safe?: Probably but not certainly. IF your local system happens to provide high voltage to the body of an appliance, connecting ground may or may not be a 'good idea'.

Category: protection Time: 2016-07-28 Views: 0

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