13 An outside antenna system should not be
located in the vicinity of overhead power
lines or other electric light or power cir-
cuits, or where it can fall into such power
lines or circuits. When installing an out-
side antenna system, extreme care
should be taken to keep from touching
such power lines or circuits as contact
with them might be fatal.
14 Do not overload wall outlets and exten-
sion cords as this can result in fire or
electric shock.
15 Never push objects of any kind into this
television equipment through openings as
they may touch dangerous voltage points
or short-out parts that could result in a fire
or electric shock. Never spill liquid of any
kind on the television equipment.
16 Do not attempt to service this television
equipment yourself as opening or remov-
ing covers may expose you to dangerous
voltage or other hazards. Refer all servic-
ing to qualified service personnel.
17 Unplug this television equipment from the
wall outlet and refer servicing to qualified
service personnel under the following
conditions:
(a) When the power-supply cord or plug is
damaged or frayed.
(b) If liquid has been spilled, or objects
have fallen into the television equip-
ment.
(c) If the television equipment has been
exposed to rain or water.
(d) If the television equipment 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 techni-
cian to restore the TV receiver to its
normal operation.
(e) If the television equipment has been
dropped or the cabinet has been dam-
aged.
(f) When the television equipment exhibits
a distinct change in performance - this
indicates a need for service.
18 When replacement parts are required, be
sure the service technician has used
replacement parts specified by the manu-
facturer that have the same characteris-
tics as the original part. Unauthorized
substitutions may result in fire, electric
shock or other hazards.
19 Upon completion of any service or repairs
to this television equipment, ask the ser-
vice technician to perform safety checks
to determine that the television is in a
safe operating condition.
20 If an outside antenna or cable system is
connected to the television receiver, be
sure the antenna or cable system is
grounded so as to provided some protec-
tion against voltage surges and built-up
static charges.
Section 810 of the National Electrical
Code, ANSI/NFPA N0.70-1984, provides
information with respect to proper ground-
ing of the mast and supporting structure,
grounding of the lead-in wire to an anten-
na discharge unit, size of grounding con-
ductors, location of antenna-discharge
unit, connection to grounding electrodes,
and requirements for the grounding elec-
trode.
4
important safeguards
ANTENNA
LEAD IN
WIRE
ANTENNA
DISCHARGE UNIT
(NEC SECTION 810-20)
GROUNDING CONDUCTORS
(NEC SECTION 810-20)
GROUND CLAMPS
POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250, PART H)
ELECTRIC
SERVICE
EQUIPMENT
NEC-NATIONAL ELECTRICAL CODE
GROUND
CLAMP
EXAMPLE OF ANTENNA GROUNDING
