... in different occasions: a. 31 wiring plan: single battery pack, single-bus not sectionalizing, no voltage-reduction set, ... of outputting single voltage; b. 33 wiring plan: single battery pack, single-bus not sectionalizing, equipped with voltage-reduction set ... of outputting single voltage; c. 35 wiring plan: single battery pack, single-bus not sectionalizing, equipped with voltage-reduction set ...