If you don’t want to fully unplug your computer, then the most important thing you need to do is to protect it from surges. Give yourself a small window with a surge protector and a UPS. It also gives you plenty of time to exit out of programs and save files so you aren’t caught unprepared. While it’s not a fun option, this means lightning can’t reach your computer through your house’s wiring. If you know a bad storm is on the way and you don’t have time to buy any protective tools, the best thing you can do is turn off your computer and unplug it completely. The hard stop: Turn off your computer during a storm. But here’s what you can do to limit the risk of damaging your computer or losing progress: Because it’s plugged into the socket 24/7 and doesn’t have a battery, you don’t have the same options you would with a smartphone or a laptop.
These are usually not large enough to kill (YMMV) but they can hurt badly, and reflexively jerking your hand onto something sharp, hot or live is a risk.If you have a desktop computer, it’s vulnerable during lightning storms. These are usually high quality non polarised and MAY happily hold charge for a long time - test discharging them is a good idea. Other caps of note are the smaller X caps across phase - neutral and the Y caps from either mains lead to ground. The screwdriver tip needed re-grinding :-) ) (Long long ago I did this with 1000 Volts on a cap and the supply still connected "not quite on purpose" - definitely not recommended. Using an insulated screwdriver tip, turning your head, shutting your eyes and flinching will usually allow you to "safely" discharge "rather large" capacitors with HV still on them (as long as the source of the HV has been removed) but it can be hard on the nerves, you can get spattered with bits of screwdriver tip, it can make it hard to undo screws in future and the insurance company may refuse to pay your widow. "The book" will say you should use a resistors, insulated probes and safety glasses. Not usually a major issue but be aware of it. This can take place over minutes and can be exciting. Note that some capacitors will "recharge themselves" partially due to dielectric absorption.
In any case, when dealing with large capacitors that have had high voltage on them I will short them with a piece of wire or screwdriver tip etc. You'd be most unlikely to find them alive after a day. These capacitors will happily kill you if you let them.ĭischarge time for main capacitors is usually seconds with a supply designed to do this. These are arranged in such a manner that the supply may be switched between nominal 230 VAC and 110 VAC easily. There is a short term risk of electric shock from capacitors - principally the two large capacitors used in a "half bridge' arrangement in many PC supplies. Assume: Typical PC power supply = AC mains powered.
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