Are their any safety regulations for AC and DC (coax, telephone, cat6) cabling inside the home ?

There are. Like:

1. Never run AC and DC cables in same conduit. their is a risk of shorting of DC wires with AC and poses a safety hazard for DC device as well as people who operate them. Plus excessive EMI
2. You may run these DC cables with AC cables in neighboring conduits (no separation) if both are of made of steel (conduit wall thickness should be atleast 1 mm). If the conduits are ofr aluminium, the conduit wall thickness shoudl be 1.5 mm
3. If you are using PVC conduits, their should be at-least 5 inches spacing between AC and DC conduits for parallel runs, and the conduits can be intersected crossed at 90 degrees only.
4. you may run these DC cables with AC cables in neighboring conduits if both are of metal (the steel conduit wall thickness is 1.0 mm while if you use aluminium you have to use 1.5mm thick wall of conduit).

Please refer below standards (Building Codes) from USA for further details (the cables are same quality and hence why should our rules be very different) 

https://drive.google.com/file/d/0B1qwAW9IPZtyakFBYV9CNW9NMkE/view?usp=sharing

https://drive.google.com/file/d/0B1qwAW9IPZtyUzZ5bXpZdGR1ZW8/view?usp=sharing

- Suman Kumar Luthra @ APRC-P3 Telecom Sub-Committee