Hitachi 27AX4B, 27AX3B, 27AX0B Operating Manual page 8

IMPORTANT SAFEGUARDS
16-1 If an outside antenna is connected to the television set, be sure the antenna
system is grounded so as to provide some protection against voltage surges and built
up static charges, Section 810 of the National Electrical Code, NFPA No. 70-1975,
provides information with respect to proper grounding of the mast and supporting
structure, grounding of the lead-in wire to an antenna discharge unit, size of grounding
conductors, location of antenna discharge unit, connection to grounding electrode, and
requirements for the grounding electrode.
Click to see antenna grounding diagram.
16-2 Note to CATV system installer: (Only for the television set with CATV reception) This
reminder is provided to call the CATV system installer's attention to Article 820-40 of the
NEC that provides guidelines for proper grounding and, in particular, specifies that the
cable ground shall be connected to the grounding system of the building, as close to the
point of cable entry as practical.