I was in a national retailer (I'll leave out the name to protect the innocent) and they were doing some re-wiring so they have a place to plug in displays that are part of the shelving units. Basically they have a square steel tube that goes from the ceiling to the shelving units (20'-25') and inside that tube they ran a length of MC cable. At the bottom the cable ran along in shelving unit upright, held in place with some zip ties and then went inside the shelving unit through whatever gap existed and terminated in an ordinary 4" steel junction box with a raised cover with a couple of receptacles. The junction box just sits on the floor, under the bottom shelf but not secured in any way.

I'm hardly an expert but don't the cables and boxes need to better secured?