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SC720/SC820
Installation
3.0
Installation
ELECTRICAL HAZARD!! High Voltage (HV) and High Energy (HE) potential exists on uninsulated
components with the enclosure of the SC820. Service is restricted to authorized factory, or field site
personnel.
This equipment should ONLY be serviced by experienced technicians familiar with similar types of
commercial grade communications equipment.
The circuit fuse for the SC720/SC820 is located inside the unit. Disconnect system power prior to
servicing.
Electrical current from power and communications cables is hazardous. Connect and disconnect
cables as specified by the manufacturers recommendations when installing, moving, or opening the
covers of system components or attached devices.
All of the SAFECQM products, and attached devices, are equipped with a 3-wire power cord and
plug for the users safety. Use this power cord in conjunction with a properly grounded electrical
outlet to avoid electrical shock.
Do NOT transmit until all RF connectors are verified, secure, and any open connectors are properly
terminated.
Prior to the installation of the SC720/SC820 Data Repeater, several conditions must be satisfied and physical
phenomena considered to ensure personnel safety, compliance with UL requirements, and to optimize
performance capabilities of the SAFECOM system.
3.1
Requirements
3.1.1
Earth Ground
A proper Earth Ground SHALL be established and available for wiring to the electrical outlet used for the
SC720/SC820 AC power source. Utilize one or a combination of the following earth ground type connections:
1.
Grounding rod. Use a dedicated 0.5 to 0.625 inch (1.3 to 1.6 cm) diameter copper clad metal rod; 6 to 10
feet (1.9 to 3 m) long. Attach the grounding wire to the rod utilizing a transition clamp made of an inert
material.
The proper transition clamp will help prevent galvanic corrosion due to two dissimilar materials in contact
with each other. The earth ground SHALL be installed pursuant to local soil conditions and in accordance
with building code requirements.
Note:
2.
Cold water pipe, metallic variety, routed to earth ground.
3.
Site grounding halo.
3.1.2
Wiring and Cable
All wiring and coaxial cables utilized for the installation of the SC720/SC820 Data Repeater SHALL be in
accordance with proper RF engineering design and local building codes.
The following is recommended gauge and type wiring for installation of the SC720/SC820:
•
AC Power - Connecting wires SHALL be at least 18 AWG; maximum length of 25 feet (7.6 m).
•
EARTH GROUND line - In accordance with industry installation standards. Minimum 12 gauge solid wire.
•
ANTENNA - The type of antenna feedline used for connecting the SC720/SC820 transmit and receive lines,
to an antenna(s), will be determined by the type of configuration used for each customer at a repeater site.
Select a feedline cable with as small a loss as possible, and its length should be as short as possible. The
VSWR of the antenna should be no more than 1.5 to 1.
Contact a Radionics SAFECOM Applications Engineer for assistance in making recommendations as to the type
of antenna feedline.
3.1.3
Power
Primary power for the SC720/SC820 Data Repeater is 120 VAC/60 Hz. Connect the SC720/SC820 to an
electrical outlet that is rated at 15 A.
For an UL Listed SC720/SC820 Data Repeater configuration, AC MUST be the Primary power source. One of
the following Backup power source configurations is required in the case of Primary AC power source FAILURE:
90007-201C
An AC ground to the wiring conduit or electrical outlet may be used in conjunction with
the number 1 and 2 ground type connections.
SC720/SC820 Operation and Installation Guide
Page 10
© 2004 Bosch Security Systems
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