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Old 12-09-2019, 10:13 AM   #21
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alot of the procedures guys follow in industrial and utility arena. 9 times our of 10 the procedures are a result of an accident.

For example...when i worked for a POCO in the 80's....when we pulled out and 5KV breakers for maintenance....there was a written procedure I followed.....one of the steps was to after the breaker was pulled out.......I would lay on my back inside the cubical with only gloves, hard hat and safety glass and measure the voltage in the cubical bushings before racking the new breaker.

Looking back I understand how dangerous this is....and i am glad I wasn't the poor bastard that got fried before the procedure changed.

my point is many procedures get changed only after there was an accident.
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Old 12-09-2019, 11:29 AM   #22
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my point is many procedures get changed only after there was an accident.
Learned that handling heavy ordnance in the navy.
All handling instructions are written with someone blood after an accident.
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Old 12-09-2019, 07:00 PM   #23
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Anyone have any info on the max voltage for using a clamp-on? I've looked and can't find it.

Many years ago, I clamped a 6.9KV lead on the primary bushing of a small transformer in a substation. I was wearing rubber gloves rated for the voltage, but the vibration in the meter suggested it didn't like it.

Anyone?
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Old 12-09-2019, 07:17 PM   #24
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Anyone have any info on the max voltage for using a clamp-on? I've looked and can't find it.

Many years ago, I clamped a 6.9KV lead on the primary bushing of a small transformer in a substation. I was wearing rubber gloves rated for the voltage, but the vibration in the meter suggested it didn't like it.

Anyone?
Well.... It shouldn't matter. I guess as long as there is nothing close enough to arc to, voltage doesn't really matter, but corona discharge might break the delicate circuitry.
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Old 12-09-2019, 08:12 PM   #25
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Phase to phase vs. phase to neutral/ground depends on what you're testing for.

If it's a 3Ø 3 wire load (like a motor), then phase to phase is all that matters. What if it's a 240 4 wire ∆ system? Phase to ground would be useless and confuse anyone who doesn't understand the system.

Also, why don't they get rid of the category crap and simply make meters that don't blow up?
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Old 12-09-2019, 08:24 PM   #26
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Also, why don't they get rid of the category crap and simply make meters that don't blow up?
More profit plain and simple, there’s no designing to 200% safety factor anymore. There is build to the spec and no more. Sort of like NEMA vs IEC, one is built to last an eternity, and one to a minimum spec.
It’s all dollars and cents.
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Old 12-09-2019, 08:25 PM   #27
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Has anybody mentioned that ungrounded, or high impedence ground systems you won't read anything to ground, only PtP. Could lead to surprises on motor circuits.
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