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Does this chart indicate that he maximum breaker allowed is a 30 amp?

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alfredeneuman

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Mar 3, 2011
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4,596
Location
Fullerton, CA
A Sylvania panel to me usually means Zinsco breakers.
A photo of the actual breakers would be helpful.
(Either that or a call to a competent electrician)
 
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cpakalolo

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Mar 30, 2026
Messages
120
I found an error that both the electrician and inspector failed to catch over 10 years ago. The electrician installed a Siemens breaker into the Silvana panel. While the break did fit it is not correct. Eaton has the sole ownership of the breakers for this vintage panel.

So I need to pull the breaker the electrician and inspector failed to catch and replace. I also need to pull the three Siemens I installed and replace those breakers in more recent years. I'm hesitant to do this because the bus bar is scored anytime a breaker is removed and replaced.


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I did HVAC for years. If I was hooking up electric heat in a house with fed pack or Sylvania, I would completely refuse to install with those panels. I've been called to walk a fire a few times and I brought the inspector to the problems I saw previously in the box. One time, before the fire, I took a temp and had to look at the inside and every single attachment to the bus was scorched. The panel was quite crispy, but not a single circuit blown. I shorted the line to the well pump to test and it refused to blow. It squealed and buzzed, but wouldn't blow. The previous time I had been to this home, I accidentally caused a bolted short when the disconnect welded itself. The transformer that went to their house and the neighbors house went up in flames even though it had a fuse protecting it. I was simply amazed that the house main and the 200 amp feeder breaker on the pole did not blow. It was x-mas eve and I left the scene to the electric company. I totally didn't expect to see this box again. So when I had to come back, I really didn't expect to see the same panel again. The customer said they couldn't afford a new breaker because a new one would have cost them 400 bucks. IDK the price because I don't buy them at all.
 
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cpakalolo

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Mar 30, 2026
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I jump threads a lot. Then, I comment thinking I'm looking at one done recently. And sometimes I will comment on an old one to get newer responses because every article out there far and wide is old. Not trying to stir things up or reinvent the wheel either.
 

dave*99

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May 5, 2009
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Location
Coastal NJ
I jump threads a lot. Then, I comment thinking I'm looking at one done recently. And sometimes I will comment on an old one to get newer responses because every article out there far and wide is old. Not trying to stir things up or reinvent the wheel either.
On GJ, you will get comments that "this is an old thread" quite often. Sometimes folks will advise you to start a new thread if there is a new problem to solve. There seems to be distaste for waking up zombie threads.
YMMV
 

Lassen Forge

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Apr 26, 2014
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15,831
Location
The romantic hills of central Umbria, Italy,
Our old house had a Sylvania panel in the back half of the house, and a good ol' Zinsco in the front. I had a breaker fry out on the front panel, was able to bypass the cooked bus bar, but finding a "legal" breaker for that panel so it didn't cook our homeowners was a royal PITA.
I finally found an approved breaker from Connect-a-*** electric, but it was 'spensive, and I already had a QO for both boxes when we sold the house.
 

nadogail

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Jan 23, 2009
Messages
32,278
Location
Coronado, CA
In my somewhat limited experience gained over the last few decades, I have never seen or heard of a Zinsco circuit breaker referred to by only Zinsco; they are always F—-ing Zinscos.
Many people have said they don’t open on overloads but have been known to fail catastrophicly.
 

wyliesdiesels

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Aug 14, 2012
Messages
20,241
Location
Modesto, CA
Many people have said they don’t open on overloads but have been known to fail catastrophically.

when i was a service electrician for a contractor who did lots of home warranty calls, i saw both types of failures with shitsco breakers.

I even saw entire bus stabs melted because the breakers didnt trip and kept letting power flow...
 
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