Mostly 1/30 or 1/60. Occasionally higher for very bright scenes but never lower than 1/30. And always, always, always disable slow shutter :-(
Bravo for a great question. I think outdoor camera shutter speed is an underrated setting! Ironic that most camera installations are done during the day, yest the usually most important video is taken from night shots.
Also especially important because low quality camera manufacturers often ship their cameras with a default speed of 1/5 (to make their cameras look better).
(And for the record, I agree with the above response)
Are there any guidelines in surveillence for setting the frame rate optimally if the shutter speed is known or vice versa?
In videography, the 'holy grail' is shutter speed set to double the frame rate. Though this harkens back to mechanical rotary shutters, it apparently gives a natural amount of motion blur.
One question, everybody bags on motion-blur, but aren't there conceivable situations where a high shutter speed is actually too fast, not because of exposure, but rather because the shutter obscures something? Because at a SS of 1/1000 sec with a frame rate of 10, you are not 'watching' 99% of the time! And anything that can happen within 100ms, has a good chance of being missed. Whereas at SS 1/10 and 10 fps, although it might have blur you can see something happened, and which way it was last headed...