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Old 05-17-2017, 08:36 PM   #1
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Default Pulling through 14.4kv live

Hey. I was asked by Fm to pull secondaries through 14.4 kv to 208v xmr live. Anyone done this before? Any safety tips would be nice.
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Old 05-17-2017, 08:46 PM   #2
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Hey. I was asked by Fm to pull secondaries through 14.4 kv to 208v xmr live. Anyone done this before? Any safety tips would be nice.
14.4 KV ???

Hummm .,, no way in hell if this is a convetail dry transfomer type .,,

someone did lost the ball on that.

I would just shut the primary source first before you fool around this kind of crap.

there is basically zero margin of error on that kind of voltage level.

I done alot of MV works but ya need proper tools to do this.
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Old 05-17-2017, 09:20 PM   #3
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It's a oil insulated type, padmount. He said they would put a blanket over terminals.
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Old 05-17-2017, 09:25 PM   #4
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Hey. I was asked by Fm to pull secondaries through 14.4 kv to 208v xmr live. Anyone done this before? Any safety tips would be nice.
Are you qualified to work on the level of voltage? Here in the states, you shouldn't get near that without training. I was asked to vacuum out a live 14.4kV transformer once long ago. I didn't just say no, I pulled the manufacturers manual, and read the procedure to the boss that clearly stated you could not enter the transformer live, couldn't remove panels from the primary compartment live. He was the typical "I know everything " boss that didn't know squat. I raised enough hell that he dropped it. I was worried he would try to BS someone else. At the end of the day, I was willing to go home for good if need be. Everyone on that kind of pull is in danger, not just the guy at the transformer.
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Old 05-17-2017, 09:31 PM   #5
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It's a oil insulated type, padmount. He said they would put a blanket over terminals.
Do that company did have some type of training to dealt with that kind of voltage ?

a blanket may do a squat.,, sorry be harsh but 14.4 KV is something ya dont fool around with it.

The Canada safety dept will be instering on your sistuation on that voltage level.

Is that padmount is POCO side or customer owned transfomer ??

if that is on POCO side .,, just stay the heck out of that!!!
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Old 05-17-2017, 10:27 PM   #6
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No Training... not even sure we have a company standard procedure for it thats why I am looking for some info. I think the xmer is POCO, consumer starts after that termination if i recall correctly.

I think there is going to be representative of a sub contractor for POCO on site when we pull in. Pretty sure we need someone from POCO to open it for us.
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Old 05-17-2017, 10:38 PM   #7
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No Training... not even sure we have a company standard procedure for it thats why I am looking for some info. I think the xmer is POCO, consumer starts after that termination if i recall correctly.

I think there is going to be representative of a sub contractor for POCO on site when we pull in. Pretty sure we need someone from POCO to open it for us.
Ahhh I see.,,

no training on that part.,, I am sure there is something in the safety dept in your country do have some type of guideline to follow.

However the POCO will basically turn that transfomer off or boot it off ( make it safe ) depending on what their plan is.

if that is single transfomer to feed that customer location the chance they will just deengerized it by boot it off or turn the fuse off at the riser one of two. which that is the SOP on the POCO part.

plan ahead with POCO for details and meeting to set up a plan to deal with it.

that one reason why most POCO rather turn the transfomer off in first place due the arc flash is pretty insane at transfomer location. I have see it blasted few time before and I just saw one not too long ago not far where I am standing.
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Old 05-17-2017, 11:52 PM   #8
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It's a oil insulated type, padmount. He said they would put a blanket over terminals.
Who is putting "a blanket" over the terminals? If it isn't someone from the Utility, I wouldn't go near it with a 10' pole.. And that might be just long enough..

No training? No procedure for working around live 14.4 kv? Has the FM read or know anything of Z462 or know about Arc Flash? Limits of approach? If it is a pad mount, you'll be underneath the bushings..

Why can't this transformer be shutdown? Secondary feeder replacement? IMO it's too big of a risk that I'm betting no one can justify keeping it energized...

Any job can be done, until something goes sideways, something happens or someone gets hurt.. Then, as you're sitting in a courtroom, you'll be able to see "who told who what was ok to do.." I believe the term you'd be looking for is "hung out to dry" or "guilty as charged your honor"...
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Old 05-17-2017, 11:56 PM   #9
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Medium voltage feeders MUST be treated with total respect.

They can be only touched when they are cold.

After any work is completed, all elements need to be megged// hi-potted.

Only THEN can you think about re-energizing conductors.
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Old 05-18-2017, 12:03 AM   #10
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they would either shut it off or i would walk away.like other's have said 14.4 is nothing to mess with. so it's going to inconvience them,i rather do that than go home in a box!i like to see my family when i go home.let us know how it goes!
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Old 05-18-2017, 09:03 AM   #11
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What's OSHA got to say about that?
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Old 05-18-2017, 09:15 AM   #12
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What's OSHA got to say about that?
Joe.,,

The OP is from Canada so there is a Canadain verison of OSHA so the Dept of Safety and Labour is the one if I recall it correct.

I think their rules is simauir to the OSHA.
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Old 05-18-2017, 09:31 AM   #13
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Joe.,,

The OP is from Canada so there is a Canadain verison of OSHA so the Dept of Safety and Labour is the one if I recall it correct.

I think their rules is simauir to the OSHA.
Yeah.....I wasn't sure what youz guyz called it either, but I figured there's gotta be a similar entity up there.
In any case, what are they planning on telling the insurance/bond company if it doesn't work out so well?
Voltages that high will reach out and touch you.
I would drag up first, that's just nutso.
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Old 05-18-2017, 10:34 AM   #14
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Yeah.....I wasn't sure what youz guyz called it either, but I figured there's gotta be a similar entity up there.
In any case, what are they planning on telling the insurance/bond company if it doesn't work out so well?
Voltages that high will reach out and touch you.
I would drag up first, that's just nutso.
I agree with that Joe.,,

I been wonding about that related to the insurance/bond company and if anything go heckva mess they will be not too thrilled with it.
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Old 05-18-2017, 11:08 AM   #15
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Hey. I was asked by Fm to pull secondaries through 14.4 kv to 208v xmr live. Anyone done this before? Any safety tips would be nice.
Don't do it!!!!
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Old 05-18-2017, 11:26 AM   #16
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Have the POCO verify it is DEAD & they put & leave their shorting cables on it until you are finished & have cleared the area.
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Old 05-18-2017, 12:32 PM   #17
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Just worked a paramount fault that started as a failed loadbreak: The blast vaporized most of the 1/8" steel divider between high and low sides and the doors where blown almost all the way off. Blankets wouldn't have done chit.

There's absolutely no way I'd agree to pull through a hot transformer.
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Old 05-18-2017, 01:06 PM   #18
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Nope. Unless your company has a written procedure on this and everyone involved is properly trained on that procedure, this is exactly the sort of thing the law that allows you to refuse unsafe work is written for. You aren't even allowed to plug buckets into live MCC cubicles at 600V in the mills around here any more.
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Old 05-18-2017, 01:44 PM   #19
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Just worked a paramount fault that started as a failed loadbreak: The blast vaporized most of the 1/8" steel divider between high and low sides and the doors where blown almost all the way off. Blankets wouldn't have done chit.

There's absolutely no way I'd agree to pull through a hot transformer.
Flying carpet, anyone ?
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Old 05-18-2017, 01:49 PM   #20
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It's a oil insulated type, padmount. He said they would put a blanket over terminals.
Neither Fortis or Atco will allow anyone inside their transformer unless it is safe.
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