72V electrocution?

[Offroader]

Thanks for the replies.

How much would you say wearing gloves helps?

Particularly I always wear these gloves because they have very good dexterity and never wear out. Would these make getting a shock much less likely from 200 volts?

It says palms are polyurethane.

https://www.amazon.com/Ansell-Dyneema-Resistant-Polyurethane-Coating/dp/B00SJ98S8A/ref=sr_1_18?ie=UTF8&qid=1535890019&sr=8-18&keywords=ansell+hyflex

 

[LockH]

Note (in this thread, so far): "Search found 2 matches: amps"...Amperage only mentioned twice? Huh.

 

[dustNbone]

Amperage is a product of voltage and resistance. Resistance of the dry human skin being fairly constant what's the variable that affects how much amperage plows through you?

VOLTAGE

Current capacity of the circuit involved means fairly little, a 15A fuse or breaker might save your screwdriver but it's not going to help you.

 

[spinningmagnets]

Luke is right that the word "electrocution" means something specific. You can experience a shock without being electrocuted.

The flash from an arc can damage your vision, that is not electrocution. A high-amp flash can severely burn your skin (jokingly called KFF for Ketucky Fried Fingers), and even damage your fingers enough so that one or more of them can no longer be used, that is not an electrocution.

The common theme of the KFF thread is that "It hurt like a son of a bitch". Touching 100V DC connectors with dry skin under controlled conditions, you run the risk of some teenager seeing the video and then running out to show off to his friends that he can touch 100V with no damage. You may "know" that you were using DC, and your hands were not sweaty with salty water. Technically, it's nobody's fault if some idiot teenager kills themselves, or damages their body enough to be severely handicapped...they should have done their homework, right?

https://endless-sphere.com/forums/viewtopic.php?f=1&t=46713&start=25#p901381

High amps at 44V nominal

 

[fechter]

Thanks for the replies.

How much would you say wearing gloves helps?

Particularly I always wear these gloves because they have very good dexterity and never wear out. Would these make getting a shock much less likely from 200 volts?

It says palms are polyurethane.

https://www.amazon.com/Ansell-Dyneema-Resistant-Polyurethane-Coating/dp/B00SJ98S8A/ref=sr_1_18?ie=UTF8&qid=1535890019&sr=8-18&keywords=ansell+hyflex

Any gloves will help a lot. They make ones specially designed for electrical work, but they are quite expensive. I've used rubber gloves covered by leather gloves in a pinch. Leather gloves that are wet won't be so good. Thin rubber gloves are easy to puncture.

 

[dustNbone]

That's the potential issue I see with leather, or anything porous. Your hands will sweat inside them, especially when you're working your hands hard fiddling with wires and such. You could easily end up with higher conductivity than you would have with dry, bare skin.

Rubber doesn't have that problem.

 

[Chalo]

As a contrasting point, I had to do a paint job in 100+ degree heat recently, and my nitrile gloves made my hands so sweaty that when I turned them upwards, sweat would pour out from the cuffs. After short periods, my hands would come out pruned up like I'd been soaking in the bath. In that circumstance, the rubber would have served as electrical insulation, but if the gloves had torn even a little bit, it would have been worse than no gloves in terms of shock risk.

 

[Matador]

Any time someone takes a jolt but does bot dieas a result, the term electrocution is inappropriate

Electrocution = EXECUTION from electrization.

 

[fechter]

That's the potential issue I see with leather, or anything porous. Your hands will sweat inside them, especially when you're working your hands hard fiddling with wires and such. You could easily end up with higher conductivity than you would have with dry, bare skin.

Rubber doesn't have that problem.

Try using your ohmmeter and measure the resistance between hands by pinching the probes. Repeat wearing sweaty leather gloves. I bet the gloves will give a higher resistance, but you really need a rubber layer to be an insulator.

 

[spinningmagnets]

Wes posted a video of him touching the connectors from a 96V battery pack with nothing but a tingle (dry human skin, calloused hands), and I believe him. That being said, I found this:

According to ISO 60950-1 (electric shock, 0.2.1, page 23), it is safe to touch up to 60V DC in a SELV circuit, and this standard is used in both the USA and Europe

 

[craneplaneguy]

I've gotten tingled when wiring a grid tie solar array. In my shop, out of the direct sunlight, actually pretty much aimed at the wall, it still was putting out over 200 volts, so no surprise.

I have a job coming up at a remote site, a bluff above the Snake River, a pilot friend has an airstrip there and a family cabin, where I'll be re-wiring his off grid array. The open circuit voltage trips his charge controller in cold conditions (when PV works the best/produces the highest voltage), so I will be re arranging things, working with it "hot". About 70+ volts oddly enough, and I'll be standing on top the shipping container the array is mounted to, by myself with no one else for miles around. I will be paying attention, can't do it at night, too big to cover (it'd be a big hassle anyway), I'll fly in the night before and prep things at dusk, camp out, and first thing in the AM, way before full sun, wrap things up, no gloves, just avoidance of touching BOTH conductors at the same time.

 

[LockH]

Hehe... Anybuddy EVer played w/a Van de Graaff generator? The potential difference achieved by modern Van de Graaff generators can be as much as 5 megavolts. A tabletop version can produce on the order of 100,000 volts...

Hair raising!

(No kids were harmed in this experiment...)

 

[Chalo]

Hehe... Anybuddy EVer played w/a Van de Graaff generator? The potential difference achieved by modern Van de Graaff generators can be as much as 5 megavolts. A tabletop version can produce on the order of 100,000 volts...

Megavolts and picoamps. That's why they're more or less safe.

 

[markz]

Them Chinese sweat factory assembly lines just want our First World Cash.
That is why I like to buy from reputable companies, like Unit Pack Power, GrinTech, EM3EV and the like, or build my own pack.

According to ISO 60950-1 (electric shock, 0.2.1, page 23), it is safe to touch up to 60V DC in a SELV circuit, and this standard is used in both the USA and Europe

 

[Alan B]

My clean dry leather gloves are many megohms. Don't use them (for electrical work) once they get sweat soaked.

Certified electrical work glove systems use a rubber glove first and a leather outer glove. Rubber is not sturdy enough, a pinhole can kill you at high voltage. They must be inspected daily and re-certified periodically, so they are not practical for most of us to have at home.

Below a couple hundred volts clean, dry leather gloves may be enough. You have to decide for yourself, but measure them and see what you get with yours.