Quick question about wiping in CWM

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http://androidforums.com – Just to make sure I don't royally screw myself, when i'm flashing various roms, kernels, radios etc. what is necessary to wipe? I'm used to just doing a data/cache/dalvik wipe x3 before I flash things, but i'm thinking that might be a bit much. So, what is necessary to wipe pre-flash for: ROM - ? Kernel - ? Radio - ? And just for clarification, when flashing a nandroid no wiping is required right, we can just flash nand's straight away without issue? (as long as the OS versions are the same) Thanks (General)