3.4.6.15.(4)ATTRIBUTION:
Functional Statement:
F10
To facilitate the timely movement of persons to a safe place in an emergency.
F81
To minimize the risk of malfunction, interference, damage, tampering, lack of use or misuse.
Objective:
OS3.7
APPLICATION:
Electromagnetic locks on exit doors, where:
- the locks do not incorporate latches, pins or other similar devices,
- the building is equipped with a fire alarm system,
- the locking device, and all similar devices in the access to exit leading to the exit door, release upon actuation of the fire alarm signal,
- the locking device releases immediately upon loss of power controlling the electromagnetic locking mechanism and its associated auxiliary controls,
- the locking device releases immediately upon actuation of a manually operated switch readily accessible only to authorized personnel,
- a force of not more than 90 N applied to the door opening hardware initiates an irreversible process that will release the locking device within 15 s and not relock until the door has been opened,
- upon release, the locking device must be reset manually by the actuation of the switch referred to in Clause 3.4.6.15.(4)(d), and
- a legible sign is permanently mounted on the exit door to indicate that the locking device will release within 15 s of applying pressure to the door-opening hardware.
This applies, in buildings described in Sentence
1.3.3.2.(1) of Division A, to:
- interior and exterior exits, as stated in Appendix Note ., and
- exits serving floor areas that are intended for occupancy, including mezzanines as stated in Sentence 3.4.2.2.(1).
This also applies to:
- ramps, stairways and passageways used by the public as access to exits in buildings described in Sentence 1.3.3.2.(1) of Division A, as stated in Appendix Note .,
- tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1), and
- exit doors and doors to suites, including exterior doors to dwelling units, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) for application of Part 9], as stated in Sentence 9.9.6.7.(1).
INTENT:
To supersede the requirements of Sentence
3.4.6.15.(1),
which would otherwise not permit the use of locking devices, and permit electromagnetic
locks on exit doors if certain conditions are met.
This
is to limit the probability that:
- exit doors will not be readily openable in an emergency situation,
- persons will be unable to release the locking mechanisms on exit doors in an emergency situation, and
- persons will not be familiar with procedures for unlocking exit doors in an emergency situation.
This is to limit the probability of delays in the evacuation or
movement of persons to a safe place, which could lead to harm to persons.