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After we isolated the Ac compressor All is well now.
So after isolating that breaker all three ground (earth) detection lamps returned to normal/equal brightness?
In his second post he states that all three lights are/were equally bright.
Oh I took that picture to visually show that they were all equal but equally dim, so I was a little confused as to how that would happen. But if that’s the normal brightness that makes sense, it was just the meter indicating and alarm on the Bender module.
As to your later point about neutrals tied to frame, I don’t think I’ve ever seen that before.
There are several unknowns remaining. This has turned into an interesting thread because it certainly shows how chasing grounds can be frustrating, especially when you don’t have access to all the information.
Tracking down grounds is like detective work, requires a lot of time which current staffing does not allow in many cases. Often the ground fault turns out to be simply a bad connection but at other times a potential fire hazard is discovered. With the reduction in manning of qualified engineers and electricians the potential for a catastrophic event increases. As I mentioned previously letting all crew know that if something seems a little off electrically wise, let the engineers know. Could be a motor that sounds funny, a light that seems to flicker when being turned on, etc. Manpower has been reduced to the absolute minimum we have to be each others eyes and ears.
Yes. But the brightness of the lamp doesn’t change. But the ground fault was everywhere in three generators via the neutral cable and from generator to the MSB. Now everything is ok.
Everything is not OK, there is still some ground fault somewhere that wasn’t there before, disconnecting a wire or the entire unit hasn’t fixed it. You may want to go and see if some wire is chafed somewhere and shorting to ground or ???
Do it the easy and fast way, put the leads of an AC voltmeter between the housing and a known ground. If you see a bunch of volts, turn the meter to AC Amps and see what you get.
That will show how high above the couple of hundred mA it takes to kill you.
I have tried at 240v 50hz a few times, earth leakage breaker is 30mA doesnt trip when you put yourself in the circuit.
We already isolate the faulty machine which is bridge AC . We don’t have any earth fault now. And about the faulty AC compressor we will check with AC technician when we arrive to next port.
Got lucky … get sweaty and complete the circuit between each hand and the outcome will almost certainly be lethally different.
Here is a trade school version of why you didn’t die.
Sure when I say in circuit I just mean touched something live, poor conduction and clearly less than 30ma at 240v going through me
Worst shocks I have ever had is stick weld and wet glove and a
12v induction collapse from a flasher can… ( like a spark plug but worse)
Similar to me. There were no ground fault interrupters when I was a kid. I was12 years old and cleaning up my Dad’s hobby/research shop. I lifted a chassis to clean dust with a cloth rag and was thrown across the room. When I recovered Dad told me I was lucky it was only B+, had it been DC I would have been dead.He reminded that cleaning with a cloth rag is not a real bright idea around electrical appliances. Ground fault detection and interrupters have saved a lot of lives since those days.
The HF when TIG welding serves as a frequent reminder to ground well.
doesnt hurt though, can show sparks out of your finger to ground but can barely feel it
It doesn’t really hurt but it definitely gets my attention!
I’ve got an ancient Ford Model T ignition buzz coil that I used to use to power a Jacob’s Ladder, getting across that thing would really light me up!
I just took the light bulbs out, just jokin …
Oh, don’t you love it when your relief pulls an alarm relay and doesn’t tell you about it at crew change? Oh, the tails I could tell. . . .