Apex Digital Apex DT250 Manuale Utente

11. DAMAGE REQUIRING SERVICE - the product should be serviced by 

qualified personnel when: 

      A. The power supply cord or plug has been damaged.

      B. Objects have fallen into, or liquid has been spilled into the product 

           enclosure.

      C. The product has been exposed to rain.

      D. The product has been dropped or the enclosure is damaged.

      E. The product does not appear to operate normally or it exhibits a 

           marked change in performance.

12. SERVICING - The user should not attempt to service the product beyond 

that described in the user’s operating manual. All other servicing should be 

referred to qualified service personnel.

13. OUTDOOR ANTENNA GROUNDING - If an outside antenna is connect-

ed to the receiver, be sure that the antenna system is grounded so as to 

provide  protection against voltage surges and built up static charges. Section 

810 of the National Electrical Code, ANS/-NFPA No. 70- 1984 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 electrodes, and requirements for the grounding electrode. 

See Figure-1.

ANTENNA
LEAD IN WIRE

ANTENNA
DISCHARGE UNIT
(NEC SECTION 810 - 20)

GROUNDING CONDUCTORS
(NEC SECTION 810 - 21)

POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250, PARTH H)

GROUND CLAMPS

ELECTRIC
SERVICE
EQUIPMENT

3

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