The MG25C2 has 13 sp ways total, this includes the number of ways for the incomer and number of ways for outgoers. For example :
MG25C2 Accepts a 4 pole incomer leaving 9 SP ways ie. 3 TP ways. Total =13 SP ways
MG25C2 Accepts a 4 pole incomer leaving 9 SP ways ie. 3 TP ways. Total =13 SP ways