Bosch PRAESENSA, Руководство по установке

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22 en | General installation procedures and instructions PRAESENSA
2019.11 | V1.00 | Installation manual Bosch Security Systems B.V.
The PRAESENSA 19”-devices are equipped with (removable) mounting brackets for mounting
in a 19”‑rack. Use four caged nuts, nylon cup washers and pan head bolts for mounting.
Common sizes for bolts and nuts for rack mounting are M6, M8, 10‑32 or 12‑24.
!
Caution!
The rack must be grounded to a safety ground. All PRAESENSA 19”-devices have a chassis
ground screw on the rear panel, which can be used for a wire connection to the rack frame.
Use a thick, multi‑strand wire (>2.5
mm 2 ) with wire eyelets and washers for a solid
connection. This connection is mandatory for the PRA-AD604 and PRA-AD608 as a reference
for ground‑short detection and because of high internal voltages, but may improve immunity
to electrostatic discharges (ESD) for all devices.
4.5 Cable requirements
To ensure safety and system reliability, different types of cabling are required for cabling
inside the racks that house PRAESENSA devices, and for cabling between racks and to
ancillary items such as loudspeakers.
4.5.1 Precautions
Prior to installation
Confirm the following:
–
The cable selected is proper for the application, taking into account all applicable local,
state, provincial, and national codes.
– The cable has not been damaged in transit or storage.
During cable installation
The following factors must be considered:
–
Do not exceed the fill capacity of raceways and cable trays.
– Use grommets to protect cables when passing through metal studs or anything that can
possibly cause damage.
– Obey bending rules of cables and maximum pull force.
– Be sure to firestop all cables that penetrate a firewall.
– Use plenum rated cable where it is mandated.
– Use fire resistant cable when it is mandated.