UL 681-2014 pdf download
UL 681-2014 pdf download.lnstallation and Classification of Burglar and Holdup Alarm Systems.
19.3.1.11 In a system that s configured as a single signal path all signals are sent from a single transmitter. The transmitter receives any required acknowledgment signals trom the monitoring station.
19.3.1.12 In a system that is configured as a dual signal path the transmission techniques that are used may be of different levels of supervision, such as one having line security and the other without line security. Alarm signals shall be sent through both paths. Where required. an acknowledgement signal indicating to the user of the system that a signal has been received by the monitoring station needs only be sent through one of the paths.
19.3.1.13 An alternate primary with a single signal path configuration is one in which an alternate path that provides the same level of line security as the primary path is available and is brought into service before the next check-in time of the primary path should the primary path become inoperative.
19.3.1.14 An alternate primary with a dual signal path configuration is one In which an alternate path that provides the same level of line security as the primary path is available and is brought into service before the next check-in time of the primary path should the primary path become inoperative, and in addition has a second communication path that complies with 19.3.1.9.
19.3.2 Special Conditions
193.2.1 Wireless transmitters that do not provide line security
19.3.2.1.1 The installation of a one way radio (RF) signal transmitter or of a cellular telephone transceiver shall comply with either (a) or (b) below:
a) Install the one way radio transmitter or cellular transceiver with another independent signal
transmission technique such that each transmitter monitors the other so that an alarm or trouble signal will be transmitted if either transmission technique becomes impaired; or
b) Install and protect the antenna and antenna cable as follows:
1) Locate the antenna and antenna cable inside of the building where the alarm system is located; and
2) Protect the antenna with a motion detector that complies with the Standard for
Intrusion-Detection Units. UI 639, and whose alarm output is connected into an alarm initiating device arcuit of the alarm system with which it is used, and which is armed
when the alarm system is armed; and
3) Install the antenna cable:
i) In rigid metal conduit or electrical metallic tubing when it is exposed and in flexible metal conduit when It is concealed by the building structure; cx
ii) Protect it with a motion detector that complies with UL 639 whose alarm
output is connected into an alarm initiating Circuit of the system with which it Is used, and which is alarmed when the alarm system is armed. Install the
initiating device circuit wiring of the motion detector used for such protection in compliance with 19.2.2.
19.3.2.1.2 The motion detector described in 19.3.2.1.1(b) shall be adjusted to detect the motion of an
intruder within tour steps or less (see 7.3.2).
19.4 Power supplies and batteries
19.4.1 A system shall not depend solely on conirnercial power at the premises.
19.4.2 The requirement specified In 19.4.1 requires standby power to maintain the system In normal condition automatically in case of interruption of the commercial power source for periods as follows:
a) Bank Vault Alarm Systems — 72 h.
Excepuon: If the standby power source can be accessed while the bank vault is under timelock and the standby power renewed, the standby power requirement is 24 hours.
b) Mercantile and Central-Station Systems — 4 h.
C) Proprietary Systems — 24 Ii.
Exception: Standby capacity of less than 24 h may be provided it a signal indicating that the protected area unit is operating on standby power is transmitted to the central supervising station before the capacity of the standby power has decreased below 4 h.
d) Holdup Alarm Systems —8 h.
e) National Industrial Security Systems — 4 h.
19.4.3 An external power supply that is not supplied by the manufacturer of the equipment it is powering shall comply with the Standard for Power Supplies for Use with Burglar Alarm Systems, UL 603.
19.4.3 ellecllve Januwy I, 2017
19.4.4 A power supply providing energy to any component of the alarm system shall not be connected to a receptacle that is controlled by a switch.
19.4.5 A battery, rechargeable or non-rechargeable, shall be serviced and replaced:
a) As recommended by the battery manufacturer.
b) As recommended by the manufacturer of the equipment In which the battery is used, or
C) When the control unit signals that the battery needs to be replaced. 19.4.6 All batteries shall be permanently marked with the month and year of installation.
19.4.7 If the equipment that is connected to a battery supply is capable of providiog low battery supervision that feature shall be enabled.
