Make your own anti-static wristwrap

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drdoug

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Jun 15, 2015
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By the instructions for antistatic wrist straps you are earthing to the chassis, so it is the earth of the electronic circuitry, not the mains electricity earth. Yes they are the same if the computer is plugged in, but if you remove the power cord, they are not the same thing. Standing on the floor you are earthed anyway , the resistance to earth isn't 0, but you are conected to earth. A plastic mat puts you above earth. You can built up a static charge even if you are earthed, unless you are directly earthed a 0ohms. So the idea is to discharge the static to the earth of the cicuitry, in general the chassis via a small load resistance. 1 mega ohm will also dampen the static and help save the pc.

Yes the power cord should be out of the wall socket, I take it out of the PC as well. Never underestimate that someone will plug it in for you when you don't want them to. Always remember Murphy's Law and O'Toole' s law, which states Murphy was an optimist.

Now Lets get something straight here about household AC current, a 1 megaohm resistance to earth will not stop you getting electrocuted. It will lower the current going through you by such a small amount it will not make any difference. Of course if you touch an active or neutral wire that is live and you are grounded, which you effectivly are unless you are on a rubber mat etc, you will have the current flow through you to ground.
Now the good news is you should have an earth leakage switch in your fusebox, usually called a safety switch. This cuts the power so fast that it saves you. If you do not have one, get one installed asap. If you do have one check to see if it is on power and light. Originally they were installed on power only, but now it is done on both. If it is on power only; you can still get electrocuted to earth if you touch a live wire (active or neutral in the light circuits.

BTW a safety swith does not help you if you above earth and touch active and neutral together. Even if you are earthed and touch active and neutral at the exactly same time, zap.
 

drdoug

Reputable
Jun 15, 2015
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4,510
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Even if they don't work it doesn't mean you lost them. It is a matter of fact that no anti staic protection will kill components in all cases. Static will cause an issue, but it isn't always present or gets discharged to earth via other paths. Using anti static is insurance against the time it is a problem, because the cost of the static discharge can be so high.

 

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