You probably should ask your facility operator or electrician what the requirements are (who, unlike most network engineers, is qualified to decide what to do), but it sounds like replacing the PDU is simple and easy, and unquestionably not a bad thing to do. Alternatively, you can replace the 30A circuit with a 20A one. I'm not an electrician, but I'll bet it's not much more complex or expensive than replacing a breaker and a receptacle, and I'd be shocked if it took more than an hour of a qualified person's time, and I suspect it would cost about the same for parts as building some sort of adaptor cord (and less if you the electrician has spare parts - he gets a 30A breaker and 30A socket in exchange for a 20A breaker and 20A socket). The added benefit of 20A, assuming your equipment power usage is low enough to use 20A, is that it's usually cheaper (sometimes significantly) if you're paying someone else for the power circuit each month.