Stevenfyeager
Senior Member
- Location
- United States, Indiana
- Occupation
- electrical contractor
The last time I installed a 200 amp 3 phase 208 v service I used AL 250 size wires ( 4 wires) in a 2 1/2 “ riser. I need to install for another customer. Was I correct in using 2 1/2” instead of two inch ? Also, 4/0 is too small, correct? Is that because of more than three current c. conductors or ampacity ? Thank you from one who doesn’t do commercial work very often.