At least here in Australia, things are changing with all communications cabling. Unfortunately this does include CoAx and Cat5. There does not seem to be a requirement for a licensed cabler to actually install these type of cables *yet* provided they are not connected to CableTV or the phone system, but there is the potential for that to happen.
So, if you are putting in cabling yourself, what basic rules should you follow?
Do not share holes with 240V power and other cables no matter what Keep 240V separated by at least 5 CM when the cables are run, even if they need to cross each other. Powerpoint terminals and communications outlet terminals must be at least 15 CM apart.
Of course that is only my interpretation of the rules. You should always check them out yourself – they are available on www.aca.gov.au. The full rules are available in the Communications Cabling Manual from Standards Australia (www.standards.com.au)