#2 TWH copper wire used for 200 amp breaker in updated panel. It would have to be 2/0 copper wire correct? Am I missing something here? Everything in this panel looked exemplary. TIA.
According to the old NEC table T310.15(B)(16) The minimum size copper conductor for a single family dwelling 200 amp service is #2/0. If you’re calculating using the 2017 NEC then it would be 83% of the service ampacity so in this case your minimum conductor size is 200*83% = 166 amps which is #2/0.
This isn’t 2/0 and/or the wiring would be labeled 2/0, correct?
yes, it should be labeled 2/0. You can verify it by checking the diameter. #2 is .257 and #2/0 is .364. Use plastic calipers if you do this!
2/0 would be about double the size of this wire, if I’m not mistaken? So this wire isn’t even close.
The number 2 and the insulation type of THW is clearly indicated in your photo. A caliper measurement will confirm that it is not a #2/0. According to NEC Chapter 9, Table 5 a #2 THW conductor has a diameter of .412", a #2/0 THW conductor has a diameter of .578".
Robert is correct on the O.D diameter of the wire. I noted the diameter less the insulation.
Branch wiring at top of SEP should be spread across the multiple entrance ports … not all bundled. I don’t believe the NEC allows for such bundling.
It looks like there is an SE cable connector with all of the NM cables which is a violation.
Are you referring to these?
If so what is the problem?
I have yet to see a single SE cable connector that is listed for 15 or 20 NM cables like in photo of the OP.
Is this a manufactured home? is there a disconnect outside? Could it be a 100 AMP disconnect feeding this?
Yes that’s it. In some parts of the country this seems to be acceptable which is why initially I didn’t comment on it. Here’s the NEC reference:
Thank you Mr. Meier
Your post are always greatly appreciated…Yep!
You’re welcome and thanks for the kind words. 