TOPIC: Panel Question

Yes Mike has it right.  I had a feeling you were adding both sides of the breaker together.  This is a 100A main disconnect.  And you are right to call out the double tap.

Here is some helpful info from Nachi electrical course.

Determining Available Home Service

The correct way to determine the available amperage is to determine the ampacity of the lowest rated of the following components

Service supply
Electric meter & socket
Service entrance conductors
Service disconnect
Distribution panel

Here are a couple of examples:
A 200 amp service lateral, a 200 amp meter and base, a 175 amp rated SEC, a 150 amp rated panel, and a 125 amp service disconnect. = A 125 amp reportable service supply.
A 150 amp service drop, a 60 amp meter and base, a 150 amp SEC, a 100 amp rated panel, and a 100 amp service disconnect. = A 60 amp reportable service supply.

I have to disagree with this statement "The correct way to determine the available amperage is to determine the ampacity of the lowest rated of the following components". For Example if you have a 2/0 copper SEC, which is for 200 amp service, and a 100 amp panel, it is still a 200 amp service, not 100 amp. It is also unsafe, and should be reported as such. The SEC, breaker, panel, meter panel should all have matching ampacity.

As an HI, you know that a 2/0 can carry 200 amps, but you have no way to tell how much is actually coming in from the electric company, you have to assume the amps is what the SEC can safely carry. So a 200 amp SEC in a 100 amp panel can cause the panel to overheat.

As an HI, you know that a 2/0 can carry 200 amps, but you have no way to tell how much is actually coming in from the electric company, you have to assume the amps is what the SEC can safely carry. So a 200 amp SEC in a 100 amp panel can cause the panel to overheat.

If you are talking about 2/0 coming into a panel with a 100 amp disconnect, there is no way that this is considered unsafe.

Jeff

As an HI, you know that a 2/0 can carry 200 amps, but you have no way to tell how much is actually coming in from the electric company, you have to assume the amps is what the SEC can safely carry. So a 200 amp SEC in a 100 amp panel can cause the panel to overheat.

If you are talking about 2/0 coming into a panel with a 100 amp disconnect, there is no way that this is considered unsafe.

Jeff

Yeah, I had that backwards, If the breaker amp is larger than the SEC amp then it is unsafe. Thanks for the correction.

Ok; confession time, I assumed (and made an a** of myself in the process) that a properly connected double 100A breaker was equivalent to a 200A breaker.  My big time error, thanks for the correction. 
I had to strain and darn near stick my nose into the box to see that the SE wires were 2AWG Aluminum...but it is there, so I was going to call it out as 100A regardless because of the "weakest link" in the panel, breaker, SE wire chain. 
The breaker I was also calling out, since it's just a 15A breaker.  Yes they did put the transformer outside the box, but the fact that it was double tapped just wasn't right. 
And finally...I still have the check and report in hand...if he doesn't want it cashed till Tuesday, fine.  I actually called his bank to confirm the account was legit.
Michael:  As much as I hate the Dirty, Hated South Siders...I have to say "THANK YOU" from the Twins!  ;D

No problem Casey, even us dirty hated southsiders can figure out an electric panel!! LOL  ;D