Fig. 1
Example of antenna grounding as per National Electrical Code
Antenna lead-in wire
Ground clamp
Antenna discharge unit 
(NEC section 810-20)
| Electric Service | Grounding conductors |
| Equipment |
| (NEC section 810-21) |
| |
| | Ground clamps |
Power service grounding electrode system
(NEC art 250, part H)
NEC—National Electric Code
13.Lightning—For added protection of this product during a lightning storm, or when it is left unattended and unused for long periods of time, disconnect it from the wall outlet. This will prevent damage to the product due to lightning and power-line surges.
14.Power Lines—An outside antenna system should not be located in the vicinity of overhead power lines or other electric light or power circuits, or where it can fall into such power lines or circuits. When installing an outside antenna system, extreme care should be taken to keep from touching such power lines or circuits as contact with them might be fatal.
15.Overloading—Do not overload wall outlets and extension cords as this can result in a risk of fire or electric shock.
16.Objects and Liquid Entry—Never push objects of any kind into this product through openings as they may touch dangerous voltage points or short out parts that could result in a fire or electric shock. Be careful not to spill liquid of any kind onto the product.
17.Servicing—Do not attempt to service this product yourself as opening or removing covers may expose you to dangerous voltage or other hazards. Refer all servicing to qualified service personnel.
| 18.Damage Requiring Service—Disconnect the product | |
| 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. | |
| b. If any liquid has been spilled onto, or objects | E |
| have fallen into the product. |
| |
c.If the product has been exposed to rain or water.
d.If the product does not operate normally even if you follow the operating instructions, adjust only those controls that are covered by the operation instructions. Improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation.
e.If the product has been dropped or the cabinet has been damaged.
f.When the product 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 has used replacement parts that are specified by Canon or 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 product, ask the service technician to perform safety checks to determine that the product is in safe operating order.
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