Motorola DSR315 Manual Do Utilizador

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To protect the product from damage caused by lightning and power line surges, 

unplug it from the wall outlet and disconnect it from the antenna or cable system before a 
lightning storm or if the unit will be left unattended or unused for a long period of time. Once a 
storm passes, reconnect all antenna cables to the correct connectors. If you live in an area that 
has many lightning storms, buy polarized surge protectors and surge protectors for the power 
line, telephone line, and RF cable to protect your system from damage. Never attempt to 
connect or disconnect any wires during a thunderstorm or lightning storm.

The purpose of this reminder is to call your attention to Article 820-40 of the NEC that provides 
guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the 
grounding system of the building, as close to the point of cable entry as practical. The illustration is an 
example of antenna grounding according to the National Electrical Code Section 810, "Radio and 
Television Equipment." Check your local building and electrical codes for other restrictions on antenna 
grounding.

1.

For the ground wire, use No. 10 AWG (5.3mm2) copper, No. 8 AWG (8.4mm2) aluminum, No. 17 
AWG (1.0mm2) copper-clad steel or bronze wire, or larger.

2.

Secure the antenna lead-in 
wire and ground wires to the 
house with stand-off 
insulators spaced 4 ft. 
(1.22mm) to 6 ft. (1.83mm) 
apart.

3.

Mount the antenna discharge 
unit as close as possible to 
the place where the lead-in 
enters the house.

4.

Use a jumper wire that is no 
smaller than No. 6 AWG 
(13.3mm2) copper, or the 
equivalent, when using a 
separate antenna grounding 
electrode. See NEC Section 
810-21(1).

5.

In areas that are heavily prone to lightning storms install a lightning rod mounted to the top of the 
antenna on the back side. Install a ground strap (2 AWG, or larger, of copper wire) from the lightning 
rod to the rest of the antenna ground system.

6.

Section 810 of the National Electrical Code, ANSI/NFPA No. 70-1984, provides information about 
the following items:

- Proper grounding of the mast and supporting structure.
- Grounding of the lead-in wire to the antenna discharge unit.
- Size of grounding conductors.
- Location of antenna-discharge unit.
- Connection to grounding electrodes.
- Requirement for the grounding electrode.