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Dump Ducks are a federally protected species blanks in a "9" ????????

Edited to fix the colors of the test buttons

I think QO and Homeline breakers have more or less the same innards just in a different package. I have 2 QO AFCI breakers that I installed about 20 years ago and I don't think I have ever had them nuisance trip. They are on the 2 circuits that run most of the lighting and general purpose receptacles on the main floor of my house so they are the bedroom, living room, and the 2nd bedroom that has my ham shack in it. When I had an issue with an antenna that wasn't balanced that put a lot of RF in the shack that tripped a couple GFCIs, caused the CO detector to save a reding of like 486 ppm, caused the thermostat to reboot and caused the garage door operator to lock up, they didn't trip. They are whatever type has the light blue test button.

I did have an AFCI receptacle trip a few times with a dehumidifier plugged in to it but it isn't clear that there wasn't a problem with that dehumidifier, it ultimately had its refrigerant escape and it has never tripped on the Aprilaire dehumidifier.

In the last 5 years or so I added a circuit for a bidet seat in my bathroom that is on a afci/gfci breaker and that has nuisance tripped but only when there is a power outage, either something about the power going out or coming back on causes it to see something it doesn't like. The last time it tripped there was nothing connected to the circuit, it was just romex to a single receptacle but it was when the power went out and came back on. It has a purple test button.

I use Square D QO breakers. Only the one issue noted previously with one breaker not liking one particular vacuum cleaner.

Back to the OP. I think Eaton has some odball designs of AFCI breakers. They I think have a breaker that has a neutral connection for the breaker but not for the load. I didn't look in to this too far, maybe i will now, but they may be for use for the rule in the code about a certain type of breaker in the panel allows you to use an AFCI receptacle to meet the requirement in combination or they may have just been trying to get away with not having a neutral load connection. Of course everyone has a bad batch of product sometime too. I don't know that I would take accounts of people having problems with specific models of AFCI breaker as an inherent problem with the technology.

Also, refrigerant and oil are nonpolar. There should be no leakage current in a properly designed compressor. I more suspect that issues with refrigerators and GFCI trips have to do with wiring and terminals that aren't adequately protected from condensate and ice.

This definitely looks like an old gas line. My house was built in 1899. When we redid the electricity, behind each wall sconce, there was an old gas line. I traced all the gas line back down to the basement and all the way up to the attic.

I have a house in North Eastern NJ 30 mins outside of NYC built in 1927 and I found one of those cast iron mounts behind a flush mount in a bedroom. I have the same cloth buffered rubber BX in my house where it hadn’t been replaced during renovations by the previous owner.

I wound up removing the cast iron mount (mine had no connected gas) and replacing it with an old work fan box and romex back to the switch. I know this isn’t to code but did check for ground and I have it (yes I’ve read the story’s of high resistance grounding on BX causing it to glow like a toaster coil when there’s a fault) and I also replaced the breaker with an AFCI. I didn’t like the idea of having the BX leads in their condition living in the canopy of the fixture attached to a mount that wasn’t designed to carry the fixture. I was laminating my ceiling so I wasn’t concerned about damage, I appreciate that your case is likely different than mine in terms of total work.

What I found interesting is I removed a portion of the BX from that circuit and once you got 6 inches or more from the fixture end of the circuit, the leads were in really good condition below the sheathing. The rubber was very pliable and didn’t crack when you bent it. There was also was what appeared to be a very light gauge bonding strip inside the sheathing so I’m not sure if this wiring was circa 1927 or newer

I would say if yours isn’t connected to gas, I’d remove it and see if you couldn’t get the wiring into a metal old work box, use a anti short bushing, and check for ground continuity.

Divide it up into person/days, i.e. 1 person 12 days = 12 PDs, 2 people 4 days = 8 PDs. Divide the total cost ($3,572) by the total number of PDs, then assign individual cost by the PDs used.