You need to ask the AHJ (Authority Having Jurisdiction), such as your local fire or building inspector. Those are the guys who will make the final determination, and they can fine you and shut the building down until violations are remediated.
When running cabling, you should also consult the ANSI/TIA-569-C Commercial Building Standard for Telecommunications Pathways and Spaces. Here is an overview document, and what it says about that:
Co-installation of telecommunications cable and power cable is
governed by applicable electrical code for safety. In addition, the
following precautions should be considered in order to reduce noise
coupling from sources such as electrical power wiring, radio frequency
(RF) sources, large motors and generators, induction heaters, and arc
- Increased physical separation
- Electrical branch circuit line, neutral, and grounding conductors should be maintained close together (e.g., twisted, sheathed, taped,
or bundled together) for minimizing inductive coupling into
- Use of surge protectors in branch circuits can further limit the propagation of electrical surges.
Use of fully enclosed, grounded metallic raceway or grounded conduit
or use of cable installed close to a grounded metallic surface will
also limit inductive noise coupling.
The NEC (National Electric Code), NFPA 70, also has much to say about cabling. It has been adopted by all 50 states and most local jurisdictions. It doesn't just deal with power lines; there is quite a bit of it which deals with low-voltage (network) cabling.