Quote Originally Posted by kwired View Post
NEC does require bonding such boxes containing power conductors, does not require it (as a general rule) for the communications applications though.
that is what I know myself... the amount of power going to be introduced into the metal box in a fault when you have a tv cable, an internet cable, a telephone cable and an hdmi cable inside a plastic conduit should be rather low, and all the cables are themselves shielded...
Yet, the local code I must go by says I must run a 10 guage green coated or green and yellow coated wire through the conduit and connect it to any metal boxes and to any metal lids on such boxes. Because the conduit runs through concrete, if it was metal I would still be required to run the ground wire and bond the boxes, in case the metal conduit rusted...

Of course, no one can explain why, just tht it must be in case of lightning on the telephone or cable tv lines...