Moderator, PLEASE post.
To Michael Rogers, and anyone else interested. Don't try to tamper with house wiring to attempt to make a 20 amp circuit capable of pulling a possible 30 amps. It's crazy and dangerous The method that Chris Heywood may possibly work but I'm fairly sure that it's not legal. Remember that the fuses/breakers are not only to protect the equipment, but the wiring in the wall. This idea of Chris's could result in a very large but brief current surge that could start a fire in a wall. Michael, I would strongly suggest for your safety that you construct an adapter that includes a 20 amp breaker or fuse at that point. Remember, any "jury rigged" wiring that is not withing code, can void your insurance should there be a fire, and it's shown to be the cause of it. By putting a fuse/breaker in the adapter, you assure that unless it fails, you can have peace of mind that the building's wiring won't overheat. It's a small price to pay for peace of mind.