I'm a gas fitter/inspector here in Manitoba and when I hear about people hooking up to natural gas burners on their own it sometimes scares me...
For starters you need to ensure the pipe supplying the burner can provide enough btu's for it to operate correctly as well as the whole piping system to be sized to handle the full load of all gas equipment running simultaneously.
From there you need to find out what pressure your local utility provides your natural gas pressure within your residence. This will determine if regulators are required for the burner to operate correctly.
Also, depending on the area and location you're operating the burner, combustion air may be required as well as make up air if you're ventilating air outside.
Stay clear from combustible material as well as ensure your flame does not impinge on your kettle as it will create massive amounts of carbon monoxide and you won't be back to tell us your brewing tales. This applies for both natural gas and propane.
I could spout off about permits and insurance but if you're on here looking to DIY then you don't care about this and if your house burns down due to your burner well... you're SOL for insurance money.
So if anyone has questions on Natural Gas and installing it send me a message and I'll do my best to help you out!