One of the main reasons to use parallel conductors is to reduce over-all cost. Point this little number out to him as well. MCM size is not proportional to the amount of amperage it can carry. Take a look at the 75 degree column and compare 1500 kcmil to 1000 kcmil 625 amps as opposed to 545 amps. Gosh that extra 500 mcm bought me a whole 80 amps of extra capacity.
