Test every run
Not a sample, and not a visual check.
It passes a visual check, fails at speed, and nobody labelled anything.
Cable is in the walls for decades. Separation from power, bend radius and termination quality decide whether it carries what it's rated for, and none of those are visible once the drywall is up.
Testing is the proof. Certification results for every run catch the problems that would otherwise appear as intermittent faults months later, when finding them costs far more than the install did.
And labelling decides the cost of every future change. An equipment room where both ends of each run are labelled turns a half-day trace into a two-minute one.
Not a sample, and not a visual check.
It pays for itself the first time something breaks.
Line-voltage work goes to a licensed electrician.
Free, with a fixed written quote and no obligation.