|
I'd assume the vaporization is just dad hyperbole but that charred remains were there to figure out what happened
|
#
?
May 23, 2016 13:59
|
|
|
|
| # ? May 14, 2024 17:17 |
|
|
TTerrible posted:How did they know what happened? I don't know if investigators ever found out actually. My dad was the one who told me about the incident, and about that guy's propensity to kick circuits by bridging them with wrenches instead of walking across the goddamn room and flipping the breaker. Why that station even had power after they confirmed the gas leak is totally beyond me. Raskolnikov38 posted:I'd assume the vaporization is just dad hyperbole but that charred remains were there to figure out what happened
|
|
#
?
May 23, 2016 14:03
|
|
|
I want accuracy in my OSHA incident reporting in this thread. I know people who do similar and it drives me crazy. Tripping a breaker with a tool or wet fingers (!) doesn't tag it out at the other end. It might not stay off even if you survive the creative method of tripping. 
|
|
#
?
May 23, 2016 14:10
|
|
|
Real men kick circuits with their tongue.
|
|
#
?
May 23, 2016 20:36
|
|
|
TTerrible posted:How did they know what happened? OSHA has a special Ouija Board Investigative Team (OBIT) that they use to interview the deceased.
|
|
#
?
May 23, 2016 22:55
|
|
|
Pigsfeet on Rye posted:OSHA has a special Ouija Board Investigative Team (OBIT) that they use to interview the deceased. Get this man away from Hollywood. It could happen.
|
|
#
?
May 23, 2016 23:15
|
|
|
'Here's the ethereal astra-sonar scan, sir.' 'Enhance... enhance... enhance...'
|
|
#
?
May 23, 2016 23:59
|
|
|
Lurking Haro posted:China Export is just a snappy backcronym. The CE mark only means the manufacturer promises that the product follows European health and safety directives, which is required for sales. It's not protected. Only of you start faking certification numbers you get in trouble. China is notorious for making things similar but not quite the same. And cheap imports will blatantly skirt trademarks/brands/whatever they can to make a sale. Really, the market is caveat emptor personified. And I think this video shows what a natural gas leak can end up looking like when it goes: https://www.youtube.com/watch?v=X4iqiZOuAxM Big boom, lots of force, minimal fire, but the shockwave and expansion rate is definitely not leaving much in the immediate area.
|
|
#
?
May 24, 2016 01:15
|
|
|
Mistle posted:Big boom, lots of force, minimal fire, but the shockwave and expansion rate is definitely not leaving much in the immediate area. Actually I think it's the opposite. Pretty much everything is leaving the immediate area. In a hurry. In lots of tiny pieces.
|
|
#
?
May 24, 2016 01:36
|
|
|
TTerrible posted:I want accuracy in my OSHA incident reporting in this thread. Tidbit - for medium/high voltage equipment at work, we have these metal grounding studs. Once you've shut off the power and locked/tagged the high voltage breaker, you clamp thick safety ground cables from each phase to that grounding stud. That will discharge any residual voltage and if the equipment is switched on by accident, you'll have a three phase bolted fault that should instantly trip the breaker. (My understanding is that you still need to be very careful as the ground wires could whip in a fault due to the magnetic fields and cause serious injury.) Better than being literally burned to a crisp. Also pretty much every time a circuit breaker interrupts fault current, it degrades a little depending on what it was interrupting. That could be a 20A 120V breaker in your house, or 1200A, 15kV vacuum interrupter bottles. This company had a demonstration video where after interrupting bolted faults several times the breaker (molded case, I think 240V and say 100A) would just fail to close at all and basically was broken. So causing a fault to trip a breaker should be a last resort from both a practical and safety standpoint. Three-Phase fucked around with this message at 03:11 on May 24, 2016 |
|
#
?
May 24, 2016 03:07
|
|
|
How do you discharge a crt tvs battery?
|
|
#
?
May 24, 2016 03:13
|
|
|
They don't have batteries but the high voltage flyback transformer has some capacitors on the output that can hold a charge. There are probes where you clip one end to the chassis of the TV and then slip the point under the protective suction-cup looking thing that protects the flyback's anode from accidental touch. That will discharge it. I've never owned a professional version of the tool and I improvised one with a screwdriver taped to a ruler connected to the chassis with an alligator clip. All in all high voltage isn't very scary, it's high power that's nightmare fuel
|
|
#
?
May 24, 2016 03:17
|
|
|
MG3 posted:How do you discharge a crt tvs battery? The CRT itself stores the charge, there's no battery or capacitor. You could rig up something with a small couple-watt resistor and a screwdriver hooked to ground. I don't know if they sell discharging tools or not, or if the stored charge is actually dangerous or just hurts like hell. The capacitors in some switching power supplies may also store a nasty charge, if they are competently designed there should be an internal bleed-off resistor across them but don't count on it.
|
|
#
?
May 24, 2016 03:17
|
|
|
I've heard that it can be a dangerous shock if you mess up. I want to mess around with a tv I bought but I've been hesitant to try and discharge the electronics.
|
|
#
?
May 24, 2016 03:20
|
|
|
I've heard that if it's off at the time, it merely gives you a painful shock and a good scare but I've never made that mistake myself. It follows because while you're talking about a couple ten thousand volts, it's still just stored in the tiny ceramic caps used in the multiplier circuit of the flyback. I still wouldn't test it out on myself though. You definitely don't want to short it across your body when it's running though, that will likely kill you. I don't know how much of a charge the tube itself can accumulate but it shouldn't be a big deal unless you break the thing open, and in that case the vacuum sending glass flying is probably the scary part.
|
|
#
?
May 24, 2016 03:24
|
|
|
I'm a 25 year ham radio operator and will never crack a CRT.Take it across your chest and bad times happen. it is very unpleasant and possibly lethal. Any time I'm near any open gear > 48 volts i go into Paranoia Mode with one-hand work and rubber shoes on a rubber mat. A friend convinced me to stick my finger in a light socket when I was 5 and that was that. Can't even imagine the old hams that sit there playing with legal limit (1500 watt output) tube amplifiers, which usually consume about 3 kW of power, usually around 6000 volts at a half an amp.
|
|
#
?
May 24, 2016 03:26
|
|
|
MG3 posted:I've heard that it can be a dangerous shock if you mess up. I want to mess around with a tv I bought but I've been hesitant to try and discharge the electronics. What do you want to do? If you want to fiddle with the recalibration pots you won't be in that much danger from the HV since the HV stuff will all be protected under thick insulators unless you go messing with it. The real danger will probably be the power supply with mains voltage caps and poo poo, but if you know precautions for working with that it shouldn't be a big deal. One hand behind your back, good shoes, watch what you're doing, use insulated tools, etc. edit: if you want to do ill-advised things with the flyback transformer, my advice is don't edit 2: actually, please don't take this as me being a bitch or anything, but don't do anything at all with it unless you have a plan and some experience because i don't have that much confidence from your original inquiry and i don't want to be responsible for a death BattleMaster fucked around with this message at 03:34 on May 24, 2016 |
|
#
?
May 24, 2016 03:29
|
|
|
BattleMaster posted:What do you want to do? If you want to fiddle with the recalibration pots you won't be in that much danger from the HV since the HV stuff will all be protected under thick insulators unless you go messing with it. The real danger will probably be the power supply with mains voltage caps and poo poo, but if you know precautions for working with that it shouldn't be a big deal. One hand behind your back, good shoes, watch what you're doing, use insulated tools, etc. I want to loop the audio output into the video output to create an oscilloscope
|
|
#
?
May 24, 2016 03:34
|
|
|
MG3 posted:I want to loop the audio output into the video output to create an oscilloscope at least that would all be dealing with the low-voltage part of the TV and you won't have to go anywhere near the flyback or anything i assume you'd just be connecting L/R audo channels to the horizontal/vertical deflection but the actual process would vary widely between TV models
|
|
#
?
May 24, 2016 03:37
|
|
|
Three-Phase posted:Tidbit - for medium/high voltage equipment at work, we have these metal grounding studs. Once you've shut off the power and locked/tagged the high voltage breaker, you clamp thick safety ground cables from each phase to that grounding stud.  I work in the entertainment industry in the EU. A regular twice yearly thing is testing the 1x/5x/10x trip time of RCDs on sites. I don't know what some of the venues do when we're not around but I've seen some not trip north of 50ms on 5x  Also three phases on socapex from the early 90s with metal hardware and outer insulation damage. Ho hum. Show must go on.
|
|
#
?
May 24, 2016 03:43
|
|
|
Mistle posted:China is notorious for making things similar but not quite the same. And cheap imports will blatantly skirt trademarks/brands/whatever they can to make a sale. Really, the market is caveat emptor personified. That reminds me of a note I saw on a job sheet for a (scheduled) gas meter replacement the other day: "Leak on outlet, wadded off already and customer knew she had leaks" Who the gently caress knows they have a leak and just... lives with it? 
|
|
#
?
May 24, 2016 11:22
|
|
|
TTerrible posted:I don't work on anything HV enough for that kind of setup For those outside the EU - RCS is like a GFCI. Better than nothing, but that seems long. The GFCI/RCI is very simple technology - a differential current transformer. You have a ring the neutral and hot wire go through. If the current is exactly he same in each, the magnetic fields cancel out and you get nothing out of the current transformer secondary. If current goes out but doesn't come back through the neutral, this generates a secondary current and the unit is signaled to trip fast. We have similar equipment for big rotating machines to detect a fault internal to the motor or generator.
|
|
#
?
May 24, 2016 12:00
|
|
|
Three-Phase posted:For those outside the EU - RCS is like a GFCI. They fail inspection if they're >30ms on x1  If anyone wants entertainment power gore, check out Dodgy Technicians on Facebook. Some of the things people find are mindblowing.
|
|
#
?
May 24, 2016 14:57
|
|
|
https://twitter.com/GLudger/status/734793182903476224/photo/1
|
|
#
?
May 24, 2016 16:59
|
|
|
Are these illegal in the EU or something? 
|
|
#
?
May 24, 2016 18:52
|
|
|
JB50 posted:Are these illegal in the EU or something? Banned a couple of years ago at the same time as tungsten filament lightbubs
|
|
#
?
May 24, 2016 18:59
|
|
|
TTerrible posted:Banned a couple of years ago at the same time as tungsten filament lightbubs  https://www.bauhaus.info/mehrfachsteckdosen/c/10000326
|
|
#
?
May 24, 2016 19:15
|
|
|
JB50 posted:Are these illegal in the EU or something? Haha, no, they're perfectly fine, but they were on a class trip and presumably out in the boonies with no way to buy them. Germany has a great range of super nice power distributors. TTerrible is probably just sad about his favourite type of lightbulb being banned for being terrible wastes of electricity.
|
|
#
?
May 24, 2016 19:29
|
|
|
Not OSHA, but I had an electricity-related adventure today. A tree fell on some power lines down the road from my place, something something transformer. This resulted in my house getting some spicy watts, a surge then a brownout. Ended up frying my microwave and dishwasher before I had the good sense to turn everything off at the circuit breaker.
|
|
#
?
May 24, 2016 19:49
|
|
|
No not really
|
|
#
?
May 24, 2016 19:58
|
|
|
Volcott posted:Not OSHA, but I had an electricity-related adventure today. A tree fell on some power lines down the road from my place, something something transformer. This resulted in my house getting some spicy watts, a surge then a brownout. Ended up frying my microwave and dishwasher before I had the good sense to turn everything off at the circuit breaker. A couple years ago, we had a deal where one phase of power came lose at the pole and fell onto the neutral. Took me too long to figure out the power wasn't "out" before I turned off the breaker box. Every major 120V appliance had to be replaced and I think I'm still chasing down the occasional light fixture that was damaged.
|
|
#
?
May 24, 2016 20:22
|
|
|
Explosionface posted:A couple years ago, we had a deal where one phase of power came lose at the pole and fell onto the neutral. Took me too long to figure out the power wasn't "out" before I turned off the breaker box. Every major 120V appliance had to be replaced and I think I'm still chasing down the occasional light fixture that was damaged. I think I heard one of the firemen say something about a phase. Like, that I was down a phase? Something about half-cycling? Probably should have written it down, but I was on 3 hours of sleep, and everything will be in the insurance write-up. My table fan woke me up going a gorillion RPM on the lowest setting.
|
|
#
?
May 24, 2016 20:56
|
|
|
It was worth a punt. Also all my lights are LED thankyou .
|
|
#
?
May 24, 2016 22:49
|
|
|
http://i.imgur.com/hxYptlW.gifv
|
|
#
?
May 24, 2016 23:43
|
|
|
Schadenfreude.... averted!
|
|
#
?
May 25, 2016 01:18
|
|
|
 At least he had the good sense to expect that and plan on it happening. Still unsafe, but better than other results, like the guy catching the railroad steel
|
|
#
?
May 25, 2016 01:29
|
|
|
nice trick but how you gonna get down dummy
|
|
#
?
May 25, 2016 01:39
|
|
|
Raskolnikov38 posted:nice trick but how you gonna get down dummy He will cut his way down!
|
|
#
?
May 25, 2016 09:08
|
|
|
Raskolnikov38 posted:nice trick but how you gonna get down dummy Punch the I‐beam till he’s three metres from the ground. He should’ve brought a pickaxe.
|
|
#
?
May 25, 2016 09:47
|
|
|
|
| # ? May 14, 2024 17:17 |
|
|
Volcott posted:Not OSHA, but I had an electricity-related adventure today. A tree fell on some power lines down the road from my place, something something transformer. This resulted in my house getting some spicy watts, a surge then a brownout. Ended up frying my microwave and dishwasher before I had the good sense to turn everything off at the circuit breaker. This is why you guys should used fused plugs like your superior yet strangely deformed brothers here in Britain.
|
|
#
?
May 25, 2016 10:13
|
|