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Chapter 9
Warranty and Specifications
21. Polarization—The DIRECTV
®
DVR is equipped with a plug that will fit into the power outlet only one way. Do not modify the plug. If the plug
does not fit, contact your electrician to replace your outlet. To prevent electric shock, do not use this plug with an extension cord or outlet unless you
can fully insert the blades without blade exposure.
22. Satellite Dish Antenna Grounding
—The outdoor satellite dish antenna and the cable which connects the satellite dish antenna to the DVR must
comply with local installation codes and the appropriate sections of the National Electric Code (NEC). In particular they must comply with Article 810-
15, which covers proper installation and grounding of television receiving equipment. They must also comply with Article 820-33, which specifies that
the satellite dish antenna cable ground shall be connected to the grounding system of the building as close to the point of cable entry as is practical.
These codes require proper grounding of the metal structure of the outdoor satellite dish antenna and grounding of the connecting cable at a point where
it enters the house (or other building). If a professional installs the Satellite Dish Antenna, be sure that the installer observes installation codes. If
additional local installation codes apply, contact local inspection authorities. It is important to comply with these codes for proper operation of the
DVR.
Example of Proper Antenna Grounding
Note: If the Satellite/Antenna cable is grounded correctly (as specified above), connecting it to the DIRECTV
®
DVR will properly ground the DVR.
The DVR must be properly grounded before you connect it to a telephone line, and it must remain grounded thereafter.
Ground clamp
Electric service
equipment
Ground clamps
Power service grounding electrode
(NEC Art. 250 Part H)
Grounding conductors
Coaxial cable
Grounding block
Coaxial cable
Users_Guide_DTV3.1.book Page 150 Wednesday, June 4, 2003 7:08 PM