Hmmm...worked in the ET shop on a Destroyer Tender in about `67.
Watched a buffer go up in smoke when someone plugged it into the DC
outlet instead of the AC. We got an ETN2 to spend several hours running
all over the ship looking for a "DC extension cord" one day. The
difference? As we explained to him: "A DC plug has two prongs on it,
the AC plug has 3."
The ship was so old I sat in "Combat" and watched a radar repeater reset
because the AC in was at 90V. Had the electricians measure it at the
other end and it was 110V. What're ya gonna do?