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What is the Minimum size of Main Bonding Jumper for a service(4000 amp) with 12 sets of parallel 750 kcmils?

Question asked by ktcotter on Jun 7, 2018
Latest reply on Jan 7, 2019 by simmelectserv

I was asked to size this service main bonding jumper with 12 sets of 750 kcmils and came up with 1125 kcmils bonding jumper(1250 kcmils next standard size). When I presented my findings everyone said it didn't have to be larger then a 750 kcmils but that's not the way I read 250.102(c). Can someone please clarify?