12. In new buildings and new systems, all signal initiation and
notification circuits shall be supervised. Generally, "Class B" supervision
will be used. The return loop for the wires to the fire alarm control panel
must be indicated to be in separate conduit for class A systems. When adding
to an existing class B supervised system, class B wiring shall be used.
13. When a detection system is being installed in a building where fire or
smoke doors can reasonably be expected to be propped open for convenience or
as a necessity of operation, door hold open devices shall be provided in
accordance with paragraph 5-220.127.116.11 of NFPA 101, Life Safety Code. Regardless
of the hold open method as outlined in the above reference, all doors held
open in the same-building must release when any one hold open device is
required to be released.
14. Fire alarm systems in any structure accessible to handicapped persons
(such as business, assembly, health care, or mercantile type structures) shall
be designed for the handicapped. Examples: audio-visual alarm notification
devices for deaf persons, manual pull stations at a suitable height for
persons confined to wheelchairs (4 ft. maximum), etc.
15. When any initiating device is activated, evacuation alarms must sound
throughout the entire building. "Pre-signal" systems, or zoned or partial
evacuations are not permitted unless specifically approved by Code 4042 where
unusual conditions warrant.
16. Do not run light or power wires in 24 volt alarm circuit conduit.
17. Building fire alarm control panels shall not be used to control fire
suppression systems. Suppression systems shall have separate control panels
and detection devices for stand alone capability. Panels shall be listed (UL
or FM) for their intended service.
18. Provide one-line riser diagram of alarm system on drawing. Show each
initiating zone and bell circuit as a separate line. Also show connection to
AC power, base alarm system, mechanical (HVAC) equipment shutdown, and door
hold-open circuits as appropriate, DO NOT indicate number of conductors on
19. If sprinkler control valve tamper switches are provided, they shall be
wired to a separate zone and arranged to indicate a valve tamper condition
distinct from zone trouble, as required by NFPA 72. Placing tamper switches
on the same zone with water flow devices is prohibited by NFPA 72 A & D.
(Valves which are locked open or which are in locked valve enclosures
generally do not require electrical supervision.) Tamper switches shall be
provided under the sprinkler specification and wired under the fire alarm
20. Base-wide uniformity of audible alarm signals is highly desirable.
The designer shall contact the base fire chief to determine which type of
alarm device is most commonly in use. Normally, bells are preferred unless
4 of 22