My record with single wire, as an aside, was 42 red #16 with 2 #14 in a 2-1/2" or 3". The foreman wasn't big on using fill tables, so that one got a bit interesting when, while hand-pulling it, I snapped the #16 lead. Then there was the 3 hours of untangling the resultant head of cable (did I mention the 42 red wires?). The other trades were not thrilled with the 50' of space I needed for that bit'o'joy.
