QUOTE(End Of All Hope @ Jul 3 2017, 05:28)
Would you touch this thingy without some duct tape around the screws part?
i'm curious, what in the frozen hell brought you to think that a tiny piece of electrical tape can insulate 230V? just asking.
oh, and having seen it from the olds isn't a proper reason. my dad is quite fond of such old habits, but he'd never dare to do such a thing (IMG:[
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QUOTE(Uncle Stu @ Jul 3 2017, 05:59)
You turn allways off the electricity. Let me repeat the important part, allways. There is absolutly no reason to work with a socket without turn off the electricity and there is also not a single reason to turn it on again while you are working on a socket.
Use a multimeter. If you dont have one, If you dont know how to use a multimeter, If you dont even know what a multimeter is, you really really shouldnt play around with the electrical installation. You could not just kill youself, but also burn the house with person you love and care about inside to the ground. I mean, if you really would need duct tape to cover up any bare cables, then you did something wrong and risk lifes.
^ well said, uncle
QUOTE(yami_zetsu @ Jul 3 2017, 07:34)
Is insulating tape that bad? Then how do you suggest to bind 2 different cables?
tinplating and heat shrinking tubing to cover if you're a pro - and especially if cables have to hang around (in case it doesn't make any sense, in italian they are called respectively "stagnatura"/"saldatura con stagno" and "guaina termorestringente"). note that as a safety measure you shouldn't cut the cables at the same point, but a bit misaligned.
otherwise, the junction that uncle stu posted. this includes the case in which you're a pro but you have the space to put a junction box somewhere.
QUOTE(yami_zetsu @ Jul 3 2017, 07:34)
And while writing this I just remembered the time he made an extension and tried to plug it, it exploded, turns out he wired both cables to the same screw in the plug (IMG:[
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that's called "short circuit". it can lead to pretty bad things.
QUOTE(yami_zetsu @ Jul 3 2017, 07:58)
But just for house wiring (110v) is fine, right?
nope. 110V is already enough to see bad things.
QUOTE(Uncle Stu @ Jul 3 2017, 08:08)
Potential deadly for a healthy adult is allready 50V AC or 120V DC. Does this answer your question?
let me develop this thing a bit. at least, according to what i studied.
electric flows (being it AC or DC) don't kill you because of tension (the voltage or V, if you prefer), rather because of current (the amperage or I, which actually flow into your body and can be pretty bad for your heart - since it relies on electric pulses as well).
indirectly, voltage can kill you because you're a resistance and for Ohm's law you'll experience a current flowing through you. current which depends on the resistance itself: for example, wearing shoes can help to a certain extent. if they're made on rubber, all the best. if you're barefeet, hmmm... in the particular case you're barefeet and on a wet floor, well... you're qualified for a darwin award.
now, there's more: not only the current, but the combo of current and exposition time is to be considered.
let's put a bit of numbers. [
www.diee.unica.it]
graph here (pag 6 and 11), if you want the tl;dr version.
here in italy, home protections are calibrated on I = 29 mA (=0.029 A), which in case of a shock can be beared by an average person for an infinite time; note that infinite is related to electronic protections. in human time, it's better to speak about 5s (why such a long time? because past a certain threshold, current will interferee with the electric signals of your body and will make leaving the point of contact way more difficult than usual. it's called "tetanization").
past this time, you'll end up in a state between safety and shock depending on the resistance of the shoes. in particular, the two lines on the graph should be for R = 200 (the left one) and R = 1000. in terms of voltage, this equals to respectively 50 and 75 V.
in case I raises (thus V), exposure time lowers. iirc at something like 100 mA should be in the order of the 300 ms or so, for example. particular values of voltage may be 110 V ( = 0.36 s) and 230 V ( = 0.17 s). past these times, a certain series of effects will occur, from shock (almost granted even if within the limits, since the limits are pushed quite a bit) to heart fibrillation.
long story short, be safe. be smart. don't try this at home (IMG:[
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Jul 3 2017, 06:22
