Avermedia AVerTV DVI Box 1080i, Руководство пользователя

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(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.