I’m an engineer for a telecommunications design/engineering house, specializing in outside plant. I know that of which I speak, having designed many communications networks which occupy exactly this space on utility poles over the past half-dozen years.
Communications conductors (CATV and telephone) are required to be, at minimum, 40" below the power neutral conductor on any utility pole by the National Electrical Safety Code which is promulgated by the Institute of Electrical and Electronics Engineers. Entering the neutral space (or going above it) isn’t likely to be something you’ll ever have to do, but it is extremely dangerous. Also, cable companies, especially small independent operators, are, when it comes to construction practices, notoriously cheap, and will sometimes choose to interpret standards, shall we say, advantageously. They may also be given to short-cutting safety practices. If the company for which you are considering working doesn’t have an extensive safety training program in place, including an exam at the end of the course, you may wanna reconsider employment with them, because they’re likely just the kinda folks who’ll engage in unsafe practices. If, however, your local cable company is a regional office of one of the bigger national MSO’s, then you’ll probably find a good safety training program in place and I wouldn’t have too many concerns.