I own one of those at work. You WILL need to find out what the AWG size of your wiring is to your plug. You will need to make sure you can carry 30 amps of current. I'd bet money you will be upgrading. Nobody uses thick 30 amp capacity cabling in walls without putting in the 30 amp plug. So short answer is yes, you will need to run thicker cabling in your wall (most likely). You will also need a bigger breaker.

In all seriousness, there's alot that you could do wrong and pose a serious fire hazard. If you're ready to make the jump call an electrician for an estimate before you buy the UPS. This will all make sense to him.

PS - I am a nuclear electrician.