b.
Under electrical supervision at all times, irrespective of the
protection mode in which the circuit is operating;
c.
Spring-loaded and held in the closed position by the door or cover
protected; and
d.
Wired to break the circuit when the door or cover is disturbed.
2.3.4.3
Fail-Safe
Provide a fail-safe capability in critical elements of the IDS, including,
but not be limited to, the capability to monitor communication link
integrity and to provide self-test. When diminished functional
capabilities are detected, the system shall provide annunciation of the
fault. Fail-safe alarms shall be annunciated to be clearly distinguishable
from other types of alarms.
2.3.4.4
Line Fault
As a minimum, fault isolation at the systems level shall have the same
geographic resolution as provided for intrusion detection. Communication
links of the IDS shall have an active mode for line fault detection. The
system shall be either a static system or a dynamic system. In a static
system, the "no-alarm" condition shall always be represented by the same
signal, which shall be different than the signal originally transmitted.
The dynamic system shall represent "no-alarm" with a signal which
continually changes with time.
2.3.4.5
Power Loss
Provide the capability to detect when a critical component of the system
experiences temporary or permanent loss of power and to declare an alarm.
The alarm shall be annunciated to clearly identify the component
experiencing power loss.
2.3.5
Electrical Power
Electrical power shall be obtained by the normal commercial or base
electrical distribution system. Power shall be continuously monitored and,
if interrupted, automatic switching from primary to emergency backup
sources shall be accomplished without interruption or degradation of
critical system function. Intrusion alarms shall not be generated by power
switching; however, an indication of power switching and on-line source
shall be provided at the alarm monitor. Upon restoration of prime power,
the system shall automatically switch back to the primary source. Low
voltage condition of an on-line battery and battery charger circuit failure
shall be detected and reported as a fault condition.
2.3.5.1
Primary Power
Furnish [120] [_____] volt AC service, transformed through a two-winding
isolation transformer and rectified to low-voltage DC for system operation.
Obtain primary power [from the line side of incoming facility power] [at
the location indicated]. [Provide a separate, lockable, circuit breaker
[adjacent to the power distribution panel] [at the location indicated].]
[Provide a circuit dedicated to power IDS from a panelboard at the location
indicated. Label the circuit breaker in that panelboard: "Alarm System Do
Not Turn Off."]
SECTION 13702N
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