I’ve got this house figured up, but I’m still looking for some input.(anyone?)

If I figure it up standard: 186 amps
If I figure it up optional: 166 amps

A little bit of a variation. Is there a better way to figure this than what the NEC has laid out in the book? Obviously a lot of room is there for someone to use some discretion.

If I plug some numbers in a little different I get as much as 193 amps. Now it is my personal feeling that these bigger custom homes have way more ampacity than will ever get used. I’ve done them with 600 amp services before. I would bet those service entrance conductors never see a day over 150 amps.

So I lean heavily toward wanting to tell this guy, no problem, you still have room for another oven if you want. But I’d feel better crunching the numbers using a different engineering method, if one exists. Any suggestions?