I had a telco central office get a bad crimp on the neutral drop to the
utility transformer. This caused the neutral voltage to float somewhat. So
half the circuits had a higher than 120 volt voltage to neutral and the
other half were low voltage. Was puzzling at first. It would come and go.
Heavy loads were in effect connected to the floating neutral providing the
other side of the 220 to a bunch of other loads.
The power company did not want to believe it. It was not smoking or arcing
but I finally proved it with a voltmeter probing the actual aerial neutral
in the triplex.
-----Original Message-----
From: Mark Radabaugh
Sent: Sunday, August 23, 2020 10:53 AM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Aviat power supplies and exploding power strips
Get a meter and verify voltage line to neutral, line to ground, neutral to
ground. If you have access to the panel check the 240 line to line, and
verify that the two legs are ~120 to both ground and neutral. If all those
check out you should be good. There are some other truly weird creations
where the phasing between lines can be odd but those are very hard to
create.
Mark Radabaugh
Amplex
22690 Pemberville Rd
Luckey, OH 43443
419-261-5996
On Aug 23, 2020, at 12:45 PM, Chuck McCown <ch...@wbmfg.com> wrote:
I had something similar happen. An electrician picked the wild leg of a
three phase to connect a new receptacle. We had about 208 volts on it.
Of course only discovered after the damage. I have seen neutrals get
damaged and connected to the other side of the box giving you 220. Did
you check your AC voltage?
Sent from my iPhone
On Aug 22, 2020, at 9:35 PM, Steve Jones <thatoneguyst...@gmail.com>
wrote:
Today was an adventure, to say the least.
Without the prior info on the clusterrest clusterfuck of my career, we
are installing some wtm4200. Glancing these meanwell power supplies may
or may not be -48v.
We have two radios onsite, first powers up swimmingly
Second power supply connected only to AC decides to smoke bomb. Was
plugged into a triple plug on a power strip. Was powered on for a bit
then did its rocket ship thing. Figured ok, just a bum meanwell, the
other one is up and powering a radio without issue.
I'm plugging in a cambium ps into the triple plug as my contractor is
plugging in a power strip into the second on a duplex outlet.
The fucking powerstrip explodes, literally.
It's a cheap surge suppressor power strip. So I'm assuming the SS is what
blew up.
I have no further data, since my contractor almost lost a hand. I'll
investigate in morning daylight.
Somewhere in this power mix I screwed up.
With the limited data I have, anybody got any ideas before somebody gets
killed?
I have 2 force 300-25, a force 300_13, a , a mikrotik, and a 3000 epmp
omni on this power strip. Circuit is less than 2 feet to the breaker.
Breaker is in an extended panel I'm unaware of the wiring details. The
first wtm powered with no issue.
This is a 20 amp breaker, when the meanwell fried it didnt trip. But
simply plugging in a powerstrip, with nothing in it, almost cost my
contractor a hand.
Any idea where I fucked up. This is a grain leg and they're not to find
of explosions.
I'm wondering, since they bond the dc return to ground if it's not
energizing a chassis or something
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