Wiring for 200A disconnect breaker

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Just replace a breaker... maybe... but maybe not....... things seize, break, strip...... maybe maybe not.... good luck with it.
Since the feeder conductors are aluminum, the installing electrician should brush the wire ends clean with a stainless steel brush to remove any oxides (corrosion) and then apply antioxidant grease to them before terminating them in the new 150A disconnect. This is something I see overlooked with aluminum conductors more often than not. Even though you're selling the house, the job should be done correctly.

And doing the job correctly helps avoid things like seizing, stripping, and breaking for someone else down the road.
 
If those conductors are 2/0 Al, I don't think you could use a 150A breaker because the panel doesn't serve the entire load of the dwelling. You could use a 125A breaker. That's the way inspectors here view that anyway.
BTW, that's probably a 400A service.
 
Response to inputs from all of you

Response to inputs from all of you

I am supremely grateful for all of your inputs. I will DEF not be telling the electrician what to do, but your inputs have made me so much more educated that I can at least listen when he determines what the fix should be and respond accordingly and ask him questions based on your suggestions or the information you provided.

My biggest fear when I started the thread was that we have had zero problems with the electricity in this 5-year old home, we are the first owners, so it went from construction, with inspection by city "enforcers," through inspection by OUR inspector when we bought it and this was the first indication by anyone that the disconnect breaker was oversized. My concern is that I knew nothing about the problem, could not talk to the inspector who identified it, I have an electrician coming that I do not know at all (because we've never had any problems at this house!) and we have a firm deadline for completing the repairs.

I don't have the opportunity for several estimates or opinions on how to fix it, I'm going to HAVE to take the word of the first person besides inspector to look at it. I have hired a reputable company and hope they would be as good as all of you are who have contributed to my education here. However, I didn't want to be so uninformed about the issue that someone could come in and recommend we rewire the entire house, and me just have to say, "Okay, if that's what you have to do, fine, go for it - here's my checkbook!"

By all of you expressing your opinions and potential solutions, I am educated. I will leave the electrician alone and let him examine it and determine his best solution.....but when he comes up with the solution, I will be able to understand the broad scope of it (because of you guys, THANK YOU!) and if his potential solutions don't look at all like what you've proposed as POSSIBILITIES, I will be able to ask him important questions.

I respect professionals. In scheduling the appointment, I sent over the inspector's write-up, I asked the person who schedules their crews to ensure that they send someone who will look at the inspector's writeup in advance and be able to address it, etc.

Since you all have been so kind to help me, I will let you all know what the electrician on the scene came up with for the solution...........and I'll make sure he tells me exactly what it is, in "electrical-ese" so I can report back to all of you. Sure hoping for nothing more major than you are surmising!!!! Will get back to you all on Monday - that's when they're coming!

Thank you again for taking your time to help me.
 
My biggest fear when I started the thread was that we have had zero problems with the electricity in this 5-year old home, we are the first owners, so it went from construction, with inspection by city "enforcers," through inspection by OUR inspector when we bought it and this was the first indication by anyone that the disconnect breaker was oversized.
With this information, I would talk to your city "enforcers" and find out how and why it passed inspection. You may not have to do anything if you can show it was compliant when it was approved.
 
Quick question... if the inspector states he could not remove the cover on the exterior panel and he could not remove the cover on the garage panel, how does he know there is 2/0 wire feeding BOTH panels? The 150A breaker could be feeding the panel with 2/0 and there could be 4/0 feeding the other.
 
Quick question... if the inspector states he could not remove the cover on the exterior panel and he could not remove the cover on the garage panel, how does he know there is 2/0 wire feeding BOTH panels? The 150A breaker could be feeding the panel with 2/0 and there could be 4/0 feeding the other.
Agreed, and advised in added sentence in post #18.
 
Exterior Main Shut-Off has OVERSIZED BREAKER. "The service size is a 150A and a 200A disconnect breaker (there are two switches shown in the photos). However, the wiring to both indoor panels is 2/0 aluminum.
1. The exterior panel has two switches on it - is it possible that it was installed properly and he is wrong? It seems like if it was a major violation, it would not have past city inspections at initial construction.

It's always possible that there is nothing wrong at all but it's also possible that it just got missed on inspection.

With city or county inspections they can't check everything so they check just a few random items and if they don't find anything wrong they just figure the electricians doing the work know what they are doing.
 
Thanks for all of your inputs - the job was done today

Thanks for all of your inputs - the job was done today

The fixing of the 200A disconnect breaker challenge was completed today. The fix consisted of what several of you recommended as the solution - he just replaced the 200A breaker with a 150A breaker. :happyyes: I appreciate so much that you all educated me on what the problem actually consisted of and that you provided some perfect recommendations for how to fix it.

When the electrician came, I simply showed him the inspection report and asked him to tell me what he thought after he looked at it. I was so happy to know that I understood that his recommended fix was what you guys said in the first place, but it's "our little secret" that I knew the answer ahead of time. The gentleman who did the repair/swap out was great and the buyers will be happy that we had the electrical work completed properly by a knowledgeable electrician.

Thanks again to all of you who provided good ideas and important information to me - I appreciate it more than you know! Take care folks - Erin.
 
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