Avermedia AVerTV Hybrid NanoExpress Quick Installation Manual page 4

antenna-discharge unit, connection of grounding electrodes,
and requirements for the grounding electrode.
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Caution for users/installers in Norway - In Norway, there exists
a possibility of a hazardous situation due to voltage difference
between the screen of the coaxial cable of the cable distribution
system and the local equipment earth (typically, earthed
chassis of the computer). To avoid any hazards, antenna/cable
input connection from the TV tuner card to a Cable Distribution
System must be provided through a galvanic isolator (not
included).
Note: (for CATV system installer) This reminder is provided to call the CATV
systems installer's attention to Section 820.93 of the National Electric Code,
ANSI/NFPA 70:2005 (for US/Canada) and/or EN60728-11:2005 standard
(for Europe), which provide guidelines for proper grounding and, in
particular, specify that the coaxial cable shield shall be connected to the
grounding system of the building, as close to the point of cable entry as
practical.