I'm glad you are fine. I too had a few bad experiences with 220V buts its much nasty compared to a 110V outlet. This one is capable of 2.5A at 120V so its bad right?

A lot more people survive 110V than 220 - but I still wouldn't bother sticking my fingers in the socket............

 

LOL! CRT transformer?? A noob question. Which one do you think is bad : a CRT flyback transformer or a microwave transformer to get electrocuted with? I know death is the end result but still.

In very early TVs, the EHT came from a winding on the mains transformer and was lethal.

Flyback EHT systems can't shift much current, so its not a complete fiction that some people would do more damage to the TV than themselves - but it wouldn't be a pleasant experience. The line frequency pulses would also cause nasty electrical burns.

A microwave oven transformer is about 1/3 the voltage of mains derived EHT - but it runs at about 1/2A and can do a fair bit more before burning out - you really don't want to mess with that!!!

 

LOL! CRT transformer?? A noob question. Which one do you think is bad : a CRT flyback transformer or a microwave transformer to get electrocuted with? I know death is the end result but still.

One trick: DO NOT TRY THIS AT HOME.
Is to hold a 4ft fluorescent tube half way along and allow the pin ends to approach the EHT on a colour set, draw an arc and the tube will light.
Some circus side show acts are based on this.
Max.

 

Did you know that some people have died from testing a 9 Volt battery on their tongue???

I seriously doubt that's true.
What people?

 

I seriously doubt that's true.
What people?

Years ago on the news - an initiation ceremony, a schoolboy was blindfolded and told he would get a burn. He was touched with a chunk of ice and died of shock.

If you believe a PP3 can kill you - some people can die of it.

Mind over matter and all that...............

 

Years ago on the news - an initiation ceremony, a schoolboy was blindfolded and told he would get a burn. He was touched with a chunk of ice and died of shock.

........

Sounds like another one of those urban myths, or a variation of.
http://www.snopes.com/horrors/freakish/icebucketdeath.asp
Max.

 

I seriously doubt that's true.
What people?

What? It's the people that fell off a two story ladder and broke their neck after licking the battery.

 

Yes, that UPS output will kill. Specially if the current flows across your chest and through heart. Stops heart muscles or can cause fibrillation.

 

According to the NASA Glenn Safety Manual ( "http://osat-ext.grc.nasa.gov/gso/manual/chapter_08.pdf":htt p://osat-ext.grc.nasa.gov/gso/manual/chapter_08.pdf ):


.

.

It is current, not voltage that heats a wire, and it is current that causes physiological damage to humans. The following table shows effects of various 60-hertz currents on an average person. This data is from "Figure 6.4.3-1" of NASA-STD-3000, "Man Systems Integration Requirements", November 1986.


Current Physiological Reaction

<1 mA None

1 mA Perception threshold

1-3 mA Mild sensation

3-10 mA Painful sensation

10 mA Paralysis threshold of arms

30 mA Respiratory paralysis

75 mA Fibrillation threshold (0.5%)

250 mA Fibrillation threshold (99.5%)

4 A Heart paralysis threshold

>5A Tissue burning

 

Hello,

It is all about electrical safety.
Touching the mains can be lethal, also when generated from a UPS.
For electrical safety read the following handbook:
http://www.lanl.gov/safety/electrical/docs/09_doe_electrical_safety_handbook_rd.pdf

Bertus

 

.
It is current, not voltage that heats a wire, and it is current that causes physiological damage to humans.

It takes two to tango, how current flows in the body is connected to the nature and type of voltage connection.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2763825/

 

Yes, that UPS output will kill. Specially if the current flows across your chest and through heart. Stops heart muscles or can cause fibrillation.

Its certainly possible, there's a lot less fatalities from 110V than 220 - but I still wouldn't bother testing the theory.

 

It takes two to tango, how current flows in the body is connected to the nature and type of voltage connection.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2763825/

There was a zany kids show in the UK - one episode someone stood in a bowl of water and stuck their finger in the light socket.

They didn't bother to mention the water was in an insulating plastic bowl.

 

Electric shock is one of those things that doesn't have completely predictable outcomes.
The major factors are the amount of current passed, the path of the current and the duration it flows for.
Above a certain current your muscles contract and you may grab hold of the live conductor and be unable to let go.
Similarly the surface layer of dry skin is a reasonable insulator but if current breaks through to the moist body core (this is more likely with contact with higher voltages) the resistance is lower and hence the current much higher.
Personally I can work on live 110V D.C. control systems (battery derived, with float charge volts resulting in approximately +62V & -62V around earth) without even feeling it, others jump back like the proverbial scalded cat if they brush against it - not that I am recommending working live, just pointing out that different people have different sensitivities - perhaps some would say I am thick skinned ;-)
I have had a 50kV arc from a charged capacitor go straight through my finger with entry and exit marks - it hurt - took weeks to heal - and the current was probably rather large, though probably of short duration, but most importantly the path directly through my finger didn't go anywhere near vital organs, hence I could still carry on working and lived to type this note.
On a less flippant note people have died from contact with quite low voltages, certainly the 110V A.C. which started this thread can definitely kill, in the UK we used 240V (415V phase-phase) distribution systems, now harmonised with the EU to 230V. The regional electricity company cable jointers joint these cables live (and we are referring to underground cables not just overhead lines) but extreme care is taken to avoid direct contact with conductors preceeded by much training. Similarly we work on live 11000V overhead conductors with hands on the live conductor but working from insulated platforms while wearing conductive suits thus establishing a farady cage around the linesman.
So in normal circumstances before touching things make sure they are dead, and even then make first contact with the back of your finger then if your test device was faulty any muscle spasm on contact will cause a recoil away from the live conductor rather than a grasping of it.
As has also been mentioned there is danger from flashovers due to the release of high levels of energy with subsequent exposure to high temperatures, pressure waves and fire. When someone sticks their pick into an 11000V cable it is an interesting comparison that they can suddenly have the equivalent of 250,000 single bar (1kW) electric fires on the end of it.

 

Electric shock is one of those things that doesn't have completely predictable outcomes.
The major factors are the amount of current passed, the path of the current and the duration it flows for.
Above a certain current your muscles contract and you may grab hold of the live conductor and be unable to let go.
Similarly the surface layer of dry skin is a reasonable insulator but if current breaks through to the moist body core (this is more likely with contact with higher voltages) the resistance is lower and hence the current much higher.
Personally I can work on live 110V D.C. control systems (battery derived, with float charge volts resulting in approximately +62V & -62V around earth) without even feeling it, others jump back like the proverbial scalded cat if they brush against it - not that I am recommending working live, just pointing out that different people have different sensitivities - perhaps some would say I am thick skinned ;-)
I have had a 50kV arc from a charged capacitor go straight through my finger with entry and exit marks - it hurt - took weeks to heal - and the current was probably rather large, though probably of short duration, but most importantly the path directly through my finger didn't go anywhere near vital organs, hence I could still carry on working and lived to type this note.
On a less flippant note people have died from contact with quite low voltages, certainly the 110V A.C. which started this thread can definitely kill, in the UK we used 240V (415V phase-phase) distribution systems, now harmonised with the EU to 230V. The regional electricity company cable jointers joint these cables live (and we are referring to underground cables not just overhead lines) but extreme care is taken to avoid direct contact with conductors preceeded by much training. Similarly we work on live 11000V overhead conductors with hands on the live conductor but working from insulated platforms while wearing conductive suits thus establishing a farady cage around the linesman.
So in normal circumstances before touching things make sure they are dead, and even then make first contact with the back of your finger then if your test device was faulty any muscle spasm on contact will cause a recoil away from the live conductor rather than a grasping of it.
As has also been mentioned there is danger from flashovers due to the release of high levels of energy with subsequent exposure to high temperatures, pressure waves and fire. When someone sticks their pick into an 11000V cable it is an interesting comparison that they can suddenly have the equivalent of 250,000 single bar (1kW) electric fires on the end of it.

Telecoms use 48V because its considered to be the highest possible "safe" voltage, I can feel that much voltage but it doesn't bother me - it can still be unhealthy for someone with a dodgy ticker.

 

Telecoms use 48V because its considered to be the highest possible "safe" voltage, I can feel that much voltage but it doesn't bother me - it can still be unhealthy for someone with a dodgy ticker.

I have those box (the ones that can be opened) with screw terminals and RJ-12 output. I've tried touching those terminals with bare hands didn't have much efect except once when my hand awaas slightly moist fellt a slight tingling. But its a whole lot different when the ringer goes I guess like 100VAC I've heard. Never tried touching those terminals when the phone rang.

 

Ringer voltage can go to 90v generally.
Max.

 

Ringer voltage can go to 90v generally.
Max.

AC or DC 90V?

 

Ringer voltage can go to 90v generally.
Max.

AFAIK: its rated for about 220V - but I can't remember if that's work at or survive it.

 

AFAIK: its rated for about 220V - but I can't remember if that's work at or survive it.

220V for ringer?? I thought it was around 75-100V AC @ 20Hz. Guess what the outcome will be if someone was fixing the telephone line and someone just called to that line.