
Important Safeguards—Continued 
18.  | Object and Liquid   | 
  | kind into the appliance through openings as they may  | 
  | touch dangerous voltage points or   | 
  | could result in a fire or electric shock. Never spill liquid  | 
  | of any kind on the appliance.  | 
19.  | |
  | yourself as opening or removing covers may expose you  | 
  | to dangerous voltage or other hazards. Refer all servic-  | 
  | ing to qualified service personnel.  | 
20.  | Damage Requiring  | 
  | form the wall outlet and refer servicing to qualified ser-  | 
  | vice personnel under the following conditions:  | 
  | A. When the   | 
  | B. If liquid has been spilled, or objects have fallen into | 
FIGURE 1:
EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE, ANSI/NFPA 70
ANTENNA
LEAD IN
WIRE
GROUND 
 CLAMP ![]()
ANTENNA DISCHARGE UNIT (NEC SECTION 
ELECTRIC
SERVICE
EQUIPMENT
GROUNDING CONDUCTORS (NEC SECTION 
![]()
 GROUND CLAMPS
 POWER SERVICE GROUNDING
NEC – NATIONAL ELECTRICAL CODEELECTRODE SYSTEM
  | the appliance,  | 
C.  | If the appliance has been exposed to rain or water, | 
D. If the appliance does not operate normally by follow- | |
  | ing the operating instructions. Adjust only those con-  | 
  | trols 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 appliance to its  | 
  | normal operation,  | 
E.  | If the appliance has been dropped or damaged in  | 
  | any way, and  | 
F.  | When the appliance exhibits a distinct change in  | 
  | performance – this indicates a need for service.  | 
21. Replacement   | |
required, be sure the service technician has used  | |
replacement parts specified by the manufacturer or have  | |
the same characteristics as the original part. Unautho-  | |
rized substitutions may result in fire, electric shock, or  | |
other hazards.  | |
22. Safety   | |
repairs to the appliance, ask the service technician to  | |
perform safety checks to determine that the appliance is  | |
in proper operation condition.  | |
23. Wall or Ceiling   | |
mounted to a wall or ceiling only as recommended by  | |
the manufacturer.  | |
24.   | |
heat sources such as radiators, heat registers, stoves, or  | |
other appliances (including amplifiers) that produce  | |
heat.  | |
25. Liquid   | |
exposed to dripping or splashing and no objects filled  | |
with liquids, such as vases should be placed on the  | |
appliance.  | |
S2898A
(NEC ART 250, PART H)
3