Tadiran Telecom Coral IPx Office, Руководство по установке и аппаратным средствам, Страница: 151 / 510

Coral IPx Office Installation Manual External Connections
5-13
Pr
otection Devices
5
5.3
Protection Devices
0
This section describes the primary and secondary protection devices used with the
Coral IPx Office system and how they are installed.
.
Lightning and over-voltage arrestors are used to protect the user and the system from
lightning and other electrical hazards that may occur on external circuits connected to
the system.
Any cable that passes through open air, under open ground (i.e. across parking lots,
fields, road beds, etc.), across a bridge, or along the exterior or under the non-metallic
roof of a building, is exposed to lightning and electrical hazards.
Telephone circuit protection devices fall into two distinct design categories:
„
Primary (lightning) protection devices that limit voltages on a telephone circuit
below levels which do not present a hazard to the user. (
Table 5-4
lists
minimum specifications).
„
Secondary (surge and impulse) protectors that further limit voltages on a
telephone circuit to prevent damage to electronic equipment.
Table 5-5
lists the
specifications.
...................................................................................................
1 Introduction to Primary and Secondary Protection Devices
Any circuit connected to the Coral system that is exposed to lightning or electrical
hazards must be protected with approved lightning and surge protection devices to
avoid potentially lethal hazards to all users.
Secondary protection devices should be installed on any circuit requiring primary
lightning protection, which connects electrically to an interface of the Coral system.