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4hv.org :: Forums :: High Voltage
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Looking at arcs !?

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811a vttc
Mon Aug 30 2010, 01:41AM
811a vttc Registered Member #3097 Joined: Tue Aug 10 2010, 03:35PM
Location: Ontario Canada
Posts: 13
My Parents make me were sun Glasses ;)
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Dave Marshall
Mon Aug 30 2010, 12:53PM
Dave Marshall Registered Member #16 Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
Ok there seems to be two misconceptions in the mix here, and a bit of wondering off topic.

Firstly, tinting has absolutely nothing to do with UV protection. Zero. Tinting provides protection from light in the visible wavelength. I'm not sure how many people here have built a ZVS (most, I'd wager), or done some welding, but the ZVS arcs are not that bright. In fact, they're dim enough that I doubt you'd be able to see very much of them with a #3 lens on a welder's mask, much less a #6.

UV protection is accomplished simply by having material between you and the source. Window glass is quite an effective UV barrier, as is most plastic. A vast majority of quality safety glasses (Which you should be wearing anyway!) offer 100% UV A and UV B protection, and say so right on the glasses or packaging.

As for the off topic wandering, he's asking about the specific case of his ZVS. Not MOTs, Pole Pigs, or nuclear reactors. Even so, with a single MOT, I've never managed to get an arc, even at only a few mm long, to create a bright enough flash to be dangerous in the visible wavelengths. If visible light isn't the risk, then again, the safety glasses or sunglasses will work fine.

Honestly, in my mind, you'd have to be a bit insane to willingly wear a welder's mask when working with your average HV projects unless you could turn it off and on and do whatever you're trying to do without ever touching the device. Why would you ever put your hands near a lethal voltage source half blindfolded? With larger projects or where you have appreciable stand-off distance, that changes matters a good bit and makes it more reasonable.

-Dave
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Muttyfutty!
Mon Aug 30 2010, 02:28PM
Muttyfutty! Registered Member #2915 Joined: Fri Jun 11 2010, 10:41AM
Location: Malaysia!
Posts: 101
Personally,to be honest I never use protection on "dull" arcs;
NST, flyback arcs.
but when playing with my resonant MOT I always use welding goggles,
otherwise its painful to look at,I have someone else flip the switch
when I draw the arcs, and vice versa.
Its probably overkill, but At least it doesn't leave a green tinge
in my eyes when it burns my retina, batter safe that sorry...
I have seen ZVS arcs and they do not seem to bright...
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doctor electrons
Mon Aug 30 2010, 09:43PM
doctor electrons Registered Member #2390 Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
A tiny bit of clarification!
The reason i suggested the #3 through possibly #6 shade is because i did not know the brightness
of the arc in question. A number 3 shade is equivalent to a good pair of sunglasses, maybe not as dark or too dark, thats why
i said try them out. Also, the tint in welding goggles, helmets, and glasses is green. Green because it makes use of the arc light
to help you see the surrounding work area when you wear them. Regardless of the shade # they will all block out uva and uvb
light (which i believe is what youre after here). Welding equipment obviously goes through a bit more testing of its true protection
than say, some shades you picked up at a gas station. The shade is up to you obviously, maybe a shade #1 is all you need!
No matter how you slice it, why take a chance with your vision when you can protect it for a few bucks less than the current
cost of a pack of smokes. I have been a welder for about 18 years and i still have 2020 vision.
Your arcs are comparable to those you would see in a plasma globe i am going to assume. I have heard that the glass that the globe is made
of does block uva and uvb light, but it sure lights up a blacklight poster!!

Moral of the story is like Dave said," A vast majority of quality safety glasses (Which you should be wearing anyway!) offer 100% UV A and UV B protection, and say so right on the glasses or packaging." My apologies if i swayed the topic away from the original, but i hope the info is useful to you!!
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