Good morning:
I am a fairly new inspector, and area located in area with older homes, however, we do get some new ones occasionally (knock down rebuilds). Saw this device yesterday on an under construction home and really don’t know what to call it for research or what it’s function is. Can anyone hep here please? What exactly is it doing and what is the code that requires it?
Thanks for any help you can provide.
The green conductor is a GEC (grounding electrode conductor). The small rectangular box is an IBT (intersystem bonding terminal) which is required by the NEC for the bonding connection of CATV or phone systems to the premises GES (grounding electode system).
Thank you Robert, much appreciated.
You’re welcome. 
Why? …
Good question. Here’s the substantiation for the code change to the 2008 NEC:
Substantiation: This is one of several correlated proposals (100 Definitions,
250.95, Chapter 8 Articles) to improve the requirements related to intersystem
bonding and grounding of communication systems. The intent is to create a
dedicated and well-defined location for terminating the grounding conductors
required in Chapter 8 Articles and 770.93. These grounding conductors also
provide between communication and power systems (intersystem bonding).
The proposed termination would have sufficient capacity to handle multiple
communication systems (telecom, satellite, CATV) on premises. See the figures
I have provided.
Intersystem bonding accomplished by connection of a communication
grounding conductor to the power system is an important safety measure to
prevent occurrences of voltages between communication system and power
system. However, the existing requirements are not adequate. Bonding is
becoming difficult to implement due to changes in building construction
practices such as increased prevalence of flush construction and use of PVC
conduits. Frequently, in new construction, the grounding electrode, the raceway
and the grounding electrode conductor are hidden behind walls and not
accessible for bonding connection.
Even in older construction with accessible equipment, the requirement for
installation of intersystem bonding connection is subject to varying
interpretation because there is not a clearly defined dedicated bonding location.
The connection to the power system is sometimes haphazard. Installers are
sometimes confused over where the connection should be made especially if
multiple Communication Systems are present on premises.
In case it becomes energized the “zap” will be much less than if our big wet body was the only path to ground if we were to come into contact with it.
Certainly better than depending on a worm drive clamp around a cable clamp.
