MOTM

You don't even want to get me started on grounding and stuff like that.  I
would say the single most common cause of equipment damage is improper
grounding techniques.  I've seen about every stupid thing you can imagine.
Now as a little piece of trivia, the only way to run multiple feed DC
systems used in utility system operations is UNgrounded. Examination of  "+"
to ground and "-" to ground floating voltage measurements can tell you LOTs
about stuff that is going wrong you don't even know about yet.

Larry H