ivsenroute
Senior Member
- Location
- Florida
Low voltage transformer inside a boiler housing. Nothing else near it is burnt.
How does this happen
- Thread starter ivsenroute
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charlietuna
Senior Member
Looks to me that the transformer core and top-plate was overheated a time or two?????????? Ambient temp. damage--not load on ground wire !
whillis
Member
- Location
- Vancouver, BC
I don't think the wire is burnt, that looks like black paint over-spray from when the transformer was manufactured.
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
I wonder if that is the original location for the termination of the EGC???
I also wonder why it is nicked as so.
I also wonder why it is nicked as so.
ivsenroute
Senior Member
- Location
- Florida
wire is burnt. When you look at the insulation is gets thinner where the black starts.
dont know why it was nicked. I am wondering if this was a used replacement part from elsewhere.
The other wires nearby seem unaffected.
dont know why it was nicked. I am wondering if this was a used replacement part from elsewhere.
The other wires nearby seem unaffected.
COFFEE TIME
Member
- Location
- PHILA PA
i don't think that egc or ground? belongs there under that bolt with the bakalite? also what about the terminal next to that with the 3 wires on it,looks a little overheated.
mdshunk
Senior Member
- Location
- Right here.
I know exacly how those two bare spots got on it. When you take the top off that particular fan center and put it back on, you can easily get the ground pigtail trapped underneath. The bare spots would be in those exact places. That blackness does look like paint to me, and not burn. The bare spots look like chafing from being pinched in the past.
Yes, that is precisely where the ground pigtail is factory intended to be terminated. That screw on the little insulating board goes through a big copper grommet. The screw and the ring terminal are not insulated by any means from the chassis.
Yes, that is precisely where the ground pigtail is factory intended to be terminated. That screw on the little insulating board goes through a big copper grommet. The screw and the ring terminal are not insulated by any means from the chassis.
A big ground fault somewhere, sometime.
Years ago I did some repair work on an apartment complex.
A drill rig punched thru the 120/240 secondary and continued thru the several thousand volt primarys below. It send high voltage thru the feeders to a building with about 30 apartments.
The high voltage chose seemingly random places to show itself including 3 or 4 units at the washer pigtal GROUND. It actually blew the ground wire out in a half loop, right before the plug. I really wish I had pics of that one.
Years ago I did some repair work on an apartment complex.
A drill rig punched thru the 120/240 secondary and continued thru the several thousand volt primarys below. It send high voltage thru the feeders to a building with about 30 apartments.
The high voltage chose seemingly random places to show itself including 3 or 4 units at the washer pigtal GROUND. It actually blew the ground wire out in a half loop, right before the plug. I really wish I had pics of that one.
Low voltage transformer inside a boiler housing. Nothing else near it is burnt.
Kind of looks like an arch happened on the core of the transformer near the screw. Possible that a wire did short in the past from vibration that caused a burn on the ground wire and the mark on the core. Then cover was put on to chop up the insulation of the ground?
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