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Introduction
EXAMPLE OF ANTENNA GROUNDING AS PER THE
NATIONAL ELECTRICAL CODE
ANTENNA
DISCHARGE UNIT
(NEC SECTION 810-20)
ANTENNA LEAD
IN WIRE
GROUNDING CONDUCTORS
(NEC SECTION 810-21)
GROUND CLAMPS
POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250, PART H)
GROUND
CLAMP
ELECTRIC SERVICE
EQUIPMENT
18. SERVICING
Do not attempt to service this unit yourself as opening or removing covers may expose you to dangerous
voltage or other hazards. Refer all servicing to qualified service personnel.
For example:
a. When the power-supply cord or plug is damaged.
b. If liquid has been spilled, or objects have fallen into the unit.
c. If the unit has been exposed to rain or water.
d. If the unit does not operate normally by following the operating instructions. Adjust only those
controls that are covered by the operating instructions, as an improper adjustment of other controls may
result in damage and will often require extensive work by a qualified technician to restore the unit to its
normal operation.
e. If the unit has been dropped or the cabinet has been damaged.
f. When the unit exhibits a distinct change in performance, this indicates a need for service.
19. REPLACEMENT PARTS
When replacement parts are required, be sure the service technician uses replacement parts specified by
the manufacturer or those that have the same characteristics as the original part.
Unauthorized substitutions may result in fire, electric shock or other hazards.
20. SAFETY CHECK
Upon completion of any service or repairs to this unit, ask the service technician to perform safety checks to
determine that the unit is in proper operating condition.
21. HEAT
The product should be situated away from heat sources such as radiators, heat registers, stoves, or other
products (including amplifiers) that produce heat.
22. NOTE TO CABLE TV SYSTEM INSTALLER
This reminder is provided to call the Cable TV 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 con-
nected to the grounding system of the building, as close to the point of cable entry as practical.
NEC-NATIONAL ELECTRICAL CODE
S2898A
IMPORTANT SAFEGUARDS
(Continued)
5S20101A [E]p02-05 12/16/04, 4:27 PM4