How can I protect a vending machine wire from being cut again?
Even if the cord is protected by FMC (flexible metal conduit), once the unit falls on it, it'd best be inspected anyway. 

Install an Anti-tip Bracket on top of the unit: (intelligentvending.co.uk)



If the owner of the building will not let you secure a vending machine to the wall (which has fallen over multiple times) it's time to find a new place to put it; neither of you should want the liability of not having an anti-tip. And then never set foot in the building again; who knows what else is going on in there...

-Note, use a purchased replacement cord, wired inside the machine (no splicing outside the unit) and cord strain reliefs (grommets).



Also, you need the sticker where the machine eats you if you shake it.