LG wall oven and microwave all in one unit, panel upgrade, liability issue concerning using EGC as neutral.

Not according to this specific model owner manual, they specifically clearly required a 4 wire 240V at 50a. No other available option. I was surprise and my first to see that mentioned in the manual! There is a link for this specific model and you can check it out.
Not sure what manual you are reading but CoolWill posted the connections from the installation manual for the oven in your link.
 
Not according to this specific model owner manual, they specifically clearly required a 4 wire 240V at 50a. No other available option. I was surprise and my first to see that mentioned in the manual! There is a link for this specific model and you can check it out.
I followed your link to the website and clicked on manuals and that is where I got the info
 
Next question is that panel you changed out now no longer the service is it after the first disconnect we run into that around here the inspector allows it but technically it’s not right
Such as the disconnect used to be inside, you changed the meter and now you put the disconnect outside stupid rule no life safety issues, but not compliant
 
I followed your link to the website and clicked on manuals and that is where I got the info

Next question is that panel you changed out now no longer the service is it after the first disconnect we run into that around here the inspector allows it but technically it’s not right
Such as the disconnect used to be inside, you changed the meter and now you put the disconnect outside stupid rule no life safety issues, but not compliant
The outside part remain unchanged, it is underground and 400a meter can with 3 conduits going into ground, and two sets of conductors going into back of the house though underground which translates more work and cost prohibitive for homeowner. All I did was just replace the panel, due to known issue with Challenger. Permit and AHJ gave me approval leave the outside side grandfathered,
 
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The outside part remain unchanged, it is underground and 400a meter can with 3 conduits going into ground, and two sets of conductors going into back of the house though underground which translates more work and cost prohibitive for homeowner. All I did was just replace the panel, due to known issue with Challenger. Permit and AHJ gave me approval leave the outside side grandfathered,
Unless this was the Zinsco design under the Challenger name there is no real issue with Challenger type C equipment.

The original 1/2" wide type A breakers have been know to have issues with the buss connection but this was primarily a result of poor handling of the breakers prior to installation. The side clips were completely exposed and could get bent/opened.

The bussing in Challenger Type C loadcenters is basically the same as all of the current loadcenters with AL buss.

You could always just replace all the the breakers with Eaton BR breakers if you wanted a refresh.

At one point in the mid to late 80's Challenger had there own C design load center which was a carry over from Sylvania. They were also selling the Zinsco and Stab-Lok designs. Unfortunately recently home inspectors and then insurance companies are calling everything Challenger bad.
 
Unless this was the Zinsco design under the Challenger name there is no real issue with Challenger type C equipment.

The original 1/2" wide type A breakers have been know to have issues with the buss connection but this was primarily a result of poor handling of the breakers prior to installation. The side clips were completely exposed and could get bent/opened.

The bussing in Challenger Type C loadcenters is basically the same as all of the current loadcenters with AL buss.

You could always just replace all the the breakers with Eaton BR breakers if you wanted a refresh.

At one point in the mid to late 80's Challenger had there own C design load center which was a carry over from Sylvania. They were also selling the Zinsco and Stab-Lok designs. Unfortunately recently home inspectors and then insurance companies are calling everything Challenger bad.
Good to know, thanks for the tip, likely they may be type C. I have seen those breakers over 25 years old, regardless of brand sometimes quit functioning as should, especially when exposed to damp environment. I would agree FPE needs to go like yesterday, have replaced them from time to time, some customer just refused, just let them go. Challengers, and Bryant was two of the panels I used to install in my youthful days, I really like Bryant due to color coding, really neat feature, too bad they discontinued these feature, now on Romex, ugh! I now stick to Square D for one reason, that they were around longer than most brands of these panels making them more reliable for future service needs. 50 years later, I am 99% sure they still make them.
 
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