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Old 10-12-2011, 08:44 AM   #21
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Originally Posted by chiefestimator View Post
My switchgear contact also told me he is currently replacing a 50 year old switchgear lineup at a Naval Weapons Center. There is nothing wrong with it. The problems are hard to get breakers, no UL and no AIC.
There is no UL listing on switchgear, it is ANSI. AIC is a rating, all breakers have an AIC rating.

I have hundreds of thousands of draw out breakers of that vintage so don't know where they get that idea from. The stuff they have has lasted 50 years and nothing wrong with it, how long do they think the cheap plastic junk they make now will last?
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Old 10-12-2011, 09:28 AM   #22
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Should electrical panels have "born on" dates marked on them?
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Replies based on NEC 2014
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Old 10-12-2011, 10:21 AM   #23
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A little knowledge can be a dangerous thing ....

Sure, engineers and manufacturers assume a certain 'design life' for their products. There is no connection, however, between the 'design life' and the actual service life of a specific product. "Design life" is a strictly academic concept.

20 years old? To me, that's nearly brand new. Give me a break!

Seriously ... given a good, dry location and a properly designed (and properly used) electrical system, that panel ought to last until the cows come home.

Overheating? Yea, right. Go to your parts house and open up a brand new panel, and look closely at the bussbars. They'll show heat discoloration from the factory.

Some of this is actual heat discoloration, caused when the bars were formed and joined. Nothing to worry about.

Some of it isn't caused by heat at all. Rather, it is a natural part of a rust-resistant coating called 'irridite.' Available in verious colors, as well as clear, it tends to show rainbow hues as the thickness varies- by as little as a few angstroms. Again, it's nothing to worry about.
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Old 10-12-2011, 11:01 AM   #24
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Why unfortunately?
it's unfortunate for me because by the time the handyman has slapped in the new panel thats a couple grand out of my pocket had the HO allowed me to do the job from start to finish.
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Old 10-12-2011, 11:03 AM   #25
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Should electrical panels have "born on" dates marked on them?
Maybe propose that for the 2014 NEC, lmao.
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Old 10-12-2011, 11:07 AM   #26
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Originally Posted by Amish Electrician
A little knowledge can be a dangerous thing ....

Sure, engineers and manufacturers assume a certain 'design life' for their products. There is no connection, however, between the 'design life' and the actual service life of a specific product. "Design life" is a strictly academic concept.

20 years old? To me, that's nearly brand new. Give me a break!

Seriously ... given a good, dry location and a properly designed (and properly used) electrical system, that panel ought to last until the cows come home.

Overheating? Yea, right. Go to your parts house and open up a brand new panel, and look closely at the bussbars. They'll show heat discoloration from the factory.

Some of this is actual heat discoloration, caused when the bars were formed and joined. Nothing to worry about.

Some of it isn't caused by heat at all. Rather, it is a natural part of a rust-resistant coating called 'irridite.' Available in verious colors, as well as clear, it tends to show rainbow hues as the thickness varies- by as little as a few angstroms. Again, it's nothing to worry about.
Pretty much what I told this home owner but he kept clutching his 4 page color bid with the company logos and slogans plastered all over it saying well this guy said this and that.

He didn't write up on his bid that the kitchen counter top only had 2 receptacles and it needs 4 to meet code. I kept telling him his fancy 4 page bid had no bearing on what I was looking at.
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Old 10-12-2011, 01:53 PM   #27
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Are you really an electrician?
Yes are you or do you just play one on an Internet forum ?
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Old 10-12-2011, 04:47 PM   #28
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Yes are you or do you just play one on an Internet forum ?
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Old 10-12-2011, 07:11 PM   #29
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Originally Posted by Amish Electrician View Post
A little knowledge can be a dangerous thing ....

Sure, engineers and manufacturers assume a certain 'design life' for their products. There is no connection, however, between the 'design life' and the actual service life of a specific product. "Design life" is a strictly academic concept.

20 years old? To me, that's nearly brand new. Give me a break!

Seriously ... given a good, dry location and a properly designed (and properly used) electrical system, that panel ought to last until the cows come home.

Overheating? Yea, right. Go to your parts house and open up a brand new panel, and look closely at the bussbars. They'll show heat discoloration from the factory.

Some of this is actual heat discoloration, caused when the bars were formed and joined. Nothing to worry about.

Some of it isn't caused by heat at all. Rather, it is a natural part of a rust-resistant coating called 'irridite.' Available in verious colors, as well as clear, it tends to show rainbow hues as the thickness varies- by as little as a few angstroms. Again, it's nothing to worry about.
Absolutely, I used to work in systems engineering for a very high up company. We were required to do the following analysis for any products we produced for the military. Mean time to failure, and mean time between failure. From Wikipedia- http://en.wikipedia.org/wiki/Failure_rate

I've never enquired but I bet most electrical panel manufacturer's have the data studies on their boxes . In the world of engineering and manufacturing, it is almost a given.
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