A bank of batteries with capability of supplying 250A and a maximum voltage of 325V...

3 ft. when insulted conducted conductors are used between terminals.

3-1/2 If the building is equipped with a dehumidifier and the batteries are on insulting surfaces

4 ft Whether or not the building is equipped with a dehumidifier or the batteries are insulting surfaces

6 ft. When the floor is insulated and no dehumidifier is installed.