Hint: Questionable grounding technique.
The CATV installer made a valiant attempt at grounding the conductive shield of the coaxial cables by attaching a ground wire to a random ½-in. EMT located right next to his CATV equipment. Unfortunately, this method does not comply with Sec. 820.93(A) or Sec. 820.100.
In typical Code fashion, Sec. 820.100(A) leapfrogs readers to Sec. 800.100 for grounding and bonding of these systems. In buildings having an intersystem bonding termination, Sec. 800.100(B)(1) requires the communication system bonding/grounding connection to be made there. For buildings with no intersystem bonding termination, Sec. 800.100(B)(2) provides several options for grounding/bonding of communication systems including connecting the bonding or grounding conductor to any of the following; the grounding electrode system for the building, nonflexible metal service raceways, external connections to grounded metal service equipment, the grounding electrode conductor or its metal enclosure of the power service, the GEC or the grounding electrode of a building or structure fed from a feeder, or the grounded interior metal water piping within 5 ft of where it enters the building. This installer clamped onto a branch circuit raceway.
