Just not seeing it so maybe somebody can chime in. For a residential 100A sub-feed from a 200A main panel in the same residence, you go to the box stores and even destributers, they say you can use 2/2/2/4 SER (or SE) al cable. I can't understand how they are saying this. You can't use table 310.15(B)(6) (08 code) because it is not the main dwelling unit feed. Just don't understand how they are saying this, anybody know?
The only way I see to properly do this installation is with 3-#3 thhn/thwn and 1-#8 gnd in 1 1/4" EMT copper or 3-#1 thhn/thwn and 1-#6 gnd in 1 1/4 EMT if using aluminum. (based on 75 degree C table 310.16).
There isin't a 3-conductor+G sheathed copper cable and if you use a SE alum cable, I think you have to use the 60 degree C column of table 310.16.
Am I missing something?
The only way I see to properly do this installation is with 3-#3 thhn/thwn and 1-#8 gnd in 1 1/4" EMT copper or 3-#1 thhn/thwn and 1-#6 gnd in 1 1/4 EMT if using aluminum. (based on 75 degree C table 310.16).
There isin't a 3-conductor+G sheathed copper cable and if you use a SE alum cable, I think you have to use the 60 degree C column of table 310.16.
Am I missing something?