Yeah when I was diagnosing Linux based servers being built grounding was always a serious thing, but the ESD vests you'd wear were really to save someone who makes an oops from well dying really. Massive multimillion dollar racks being connected/disconnected and running liquid cooling through the racks leaves you coming close to the power sources fairly often. The best way to run the power is above and then have them snap on at the top so people aren't tripping over them, but the main issue with that is safety doesn't come before profit, so instead of having dedicated breaker boxes at eye level one uses a metal pole with a hook and reaches up to turn on/off all the breakers when moving in/out racks you are working on. Large metal pole... High voltage/amps...