The feeder is too short to go from the bottom, and up and around to the termination points. Thank you for your help.
Really depends on the panel. Many are designed for top feed or bottom feed, others do have a side that must be the top. Most of the time is dictated by installed breakers - including the main. If any handle operates up-down there is likely a proper up side. If all handles operate left-right it is likely able to be mounted either way.The feeder is too short to go from the bottom, and up and around to the termination points. Thank you for your help.
Often times those retaining devices only work in certain positions of the panel - quite often the ones adjacent to where a main breaker is intended to be installed.It's also acceptable to back feed a breaker to use as main if you use a clip to mechanically hold the breaker in place