Actually local codes generally dictate if the ground and neutral are to be bonded, or joined together.

I have power outlets in my garage for the bus and my local code is one that requires the two be bonded. I did not bond the two at the power outlet, but I may just as well have because 30 feet away in my circuit breaker box the two are bonded. I would feel more comfortable it they were separate, but even the UL standard to which the products are certified has provision for bonding the ground and neutral.