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Tool Talk Discussion Forum

This is why we disconnect and test

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David G

01-10-2017 09:37:21




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One of my vendors posted this picture.




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n9lhm

01-11-2017 10:23:47




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
"If it ain't grounded, it ain't dead". I've done a lot of work on high powered AM broadcast sites and metal in a high RF field picks up enough energy to shock and burn you even when it's disconnected.



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Russ from MN

01-10-2017 20:21:33




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
I got the job one time of cutting holes in the doors of switchgear and putting plexiglass over them so we could verify the switch was disconnected. Once we had locks on the handle you could no longer open the door to verify.



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jaden

01-10-2017 19:49:27




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
I have had that happen twice, both in outdoor applications. Fortunately, I checked phase to phase and each phase to ground. I may also double check with a volt stick.



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Pete black

01-10-2017 18:46:01




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
Precisely why acb's (air circuit breakers) are not used as clearance points as their contacts cannot be seen to verify "open".



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JMOR

01-10-2017 16:39:04




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
Don't let 'em beat you up too much, Geo, as those who work truly HV will do all the measuring & checking that is possible, but before touching, they will hang a grounding stick on it. Always looked right to me & so far haven't seen one dead.



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Texasmark1

01-10-2017 18:51:11




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 Re: This is why we disconnect and test in reply to JMOR, 01-10-2017 16:39:04  
Yepper!



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old-9

01-10-2017 16:17:54




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
GREAT Photo!! Just proves that anything can and will malfunction at one time or another. The most used tool on my tool belt was my voltage tester. I would guess it saved my life or at least saved me from a shock or two. I was taught to test for voltage first, then check the tester on a known voltage just to be sure the tester STILL worked. Kept me alive for 40 years. joe

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dennis min

01-10-2017 15:04:42




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
David G,

I was witness to an experienced electrician. I saw him test phase to phase on the input of a transformer..zero volts.

He then checked phase to ground and had 277vac. It turns out that the three pole breaker failed to opena phase, the transformer had a delta primary winding. Had he not been thorough, he'd been shocked in front of me.

D.

I learned my lesson by proxy.



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Chilidawg

01-10-2017 12:01:48




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
Quoting Removed, click Modern View to seeAbsolutely!



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Bret4207

01-10-2017 11:33:29




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
Quoting Removed, click Modern View to see

I'll stick with my tester thanks...



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jeffcat

01-10-2017 17:29:30




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 Re: This is why we disconnect and test in reply to Bret4207, 01-10-2017 11:33:29  
You bet! I start by rubbing my line tick on my sleave. Trilllll..Next i pull out the meter. Some of the dish machines have TWO power supplies. 240 3phase or 480 3phase. The secondary suply is 120 volt for the control systems. Kinda bites ya if you forget about that 120!!! Have gotten popped a couple of times.



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John T

01-10-2017 11:55:04




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 Re: This is why we disconnect and test in reply to Bret4207, 01-10-2017 11:33:29  
DITTO At our facility we had to preform a complex maximum short circuit current analysis and found as high as near 10,000 Amps could potentially flow through a low impedance "short circuit" and that can create some serious big time arcing and heat and extreme bright flashes YIKES and besides if a circuit breaker wasn't sufficiently rated (most however are 10,000 AIC) even more YIKES

John T

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Steve@Advance

01-10-2017 16:56:20




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 Re: This is why we disconnect and test in reply to John T, 01-10-2017 11:55:04  
I learned a hard lesson shorting 120v to trip an unmarked breaker.

It was in an industrial plant, in operation, didn't want to start turning off breakers, disrupting work.

This circuit was in a storage area above the offices. I grounded the hot lead, it killed the circuit, but didn't trip the breaker!

After 2 days searching, found a hidden junction box, behind the sheetrock. It had blown apart a bad connection...

I don't do that no mo!

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Geo-TH,In

01-10-2017 14:00:16




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 Re: This is why we disconnect and test in reply to John T, 01-10-2017 11:55:04  
JohnT,

After getting a handful of 440vac, I'll always do the arc test after using a meter and I'm still kicking. A big flash always stimulates the heart just a little, don't you think? geo



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John T

01-10-2017 14:03:19




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 Re: This is why we disconnect and test in reply to Geo-TH,In, 01-10-2017 14:00:16  
George "A big flash always stimulates the heart just a little, don't you think?"

Having seen plenty I THINK INDEED IT DOES but its a flash I don't like to experience

John T



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Geo-TH,In

01-10-2017 15:02:12




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 Re: This is why we disconnect and test in reply to John T, 01-10-2017 14:03:19  
JohnT, Sometimes when you know when there will be a big bang it can be fun.

If you know a capacitor is charged and you use a piece of solder and insulated needle nose to hold the solder to discharge cap, It will produce a big flash and bang. That's exciting. Try it. May want to wear safety glasses, solder gets vaporized. geo



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ken combs

01-10-2017 11:37:40




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 Re: This is why we disconnect and test in reply to Bret4207, 01-10-2017 11:33:29  
Me too! much preferable compared to arc flash!



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Steve@Advance

01-10-2017 10:16:46




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
I've seen the exact same thing! Horrible design!



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Geo-TH,In

01-10-2017 09:49:36




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
Like I've posted in past, test then verify by using two screwdrivers and shorting out wires to ground.



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Janicholson

01-10-2017 09:43:45




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 Re: This is why we disconnect and test in reply to David G, 01-10-2017 09:37:21  
That is nasty. A little fibrous looking trash and full rated amps makes heat and heat welds. Jim



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