Hitachi VM-3700A Instruction Manual page 13

IMPORTANT SAFETY INSTRUCTIONS FOR AC ADAPTER/CHARGER
"Note to CATV system installer: 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".
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