Often the requirements of one system will be at odds with other grounding
requirements. For instance you generally want a high impedance for RFI
issues and a very low impedance for lightning grounds. One system defeats
the other so they really need to be separate systems.
NO, NO, NO, NO!
ALL grounds in any premises MUST be bonded together. To separate them is
both ILLEGAL and DANGEROUS.
Your NEC and lightning grounds have very serious safety issues so running
your proposed wiring changes by your local power company can often be very
helpful.
Better -- there are two tutorials about power and grounding on my website.
73, Jim K9YC
http://k9yc.com/SurgeXPowerGround.pdf is written for sound and video
professionals. I got paid pretty good to write it, and also to teach it
at industry conventions.
http://k9yc.com/GroundingAndAudio.pdf is written specifically for hams.
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