The old alum cable was 3 wire Red/Black/White in a nearly round sheath. The sheath had a bump (a half circle much smaller than the main circle) as seen in cross section.
I assume that meant something (like this is alum) because it appeared to have no functional purpose.
The new cable is NM-B 10-3 W/G. This my son's fixer-upper and I feel better with no alum wire in the place. Even the 200A service is copper in conduit/steam pipe.
thanks
