Motorola DSR405 - Manual (Page 8)

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is installed under a weatherproof cover. Internal heating can draw moisture or condensation into the
covering of the unit and affect its operation. Do not use silicone seal because it has a tendency to form air
pockets.
Replacement Parts. If your receiver requires repairs, contact your equipment provider,
who will be able to assist you.
Safety Check. After the unit is serviced or repaired, ask the service technician to perform
safety checks to find out if the unit is in proper operating condition.
Lightning. 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.
Safeguard Instructions
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.
Note to the system installer: 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.