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eLibrary > BS 8893:2024 Emergency voice communication (EVC) systems. Components. Specification >

BS 8893:2024 Emergency voice communication (EVC) systems. Components. Specification, 2024

Foreword
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
3.1 access level
3.2 emergency voice communication (EVC) system
3.3 emergency voice communication, control and indicating equipment (EVCIE)
3.4 EVC mode
3.5 group call
3.6 handset
3.7 master station
3.8 non-EVC mode
3.9 off-hook
3.10 on-hook
3.11 on hold
3.12 outstation
3.13 voltage standing wave ratio
4 Requirements [Go to Page]
4.1 Overall system requirements [Go to Page]
4.1.1
4.1.2
4.1.3
Figure 1 — Frequency response requirements between a telephone handset and an outstation
4.2 Transmission paths [Go to Page]
4.2.1 General [Go to Page]
4.2.1.1
4.2.1.2
4.2.1.3
4.2.1.4
4.2.2 Radially connected EVC systems
4.2.3 Loop-connected EVC systems
4.2.4 Wireless-linked EVC systems
4.3 EVCIE mandatory indicators
4.4 EVCIE call indicators and controls [Go to Page]
4.4.1
4.4.2
4.5 EVCIE fault monitoring and indication [Go to Page]
4.5.1
4.5.2
4.6 EVCIE silencing of audible fault warning
4.7 EVCIE resetting from the fault warning condition
4.8 EVCIE power supply [Go to Page]
4.8.1
4.8.2
4.8.3
4.8.4
4.9 Program-controlled EVCIE
4.10 EVCIE indicator test
4.11 EVCIE mechanical requirements [Go to Page]
4.11.1
4.11.2
4.11.3
4.11.4
4.11.5
4.11.6
4.12 EVCIE environmental requirements [Go to Page]
4.12.1
4.12.2
4.13 Outstation general requirements [Go to Page]
4.13.1 All outstations [Go to Page]
4.13.1.1
4.13.1.2
4.13.1.3
4.13.1.4
4.13.1.5
4.13.1.6
4.13.1.7
4.13.2 Outstations that receive calls [Go to Page]
4.13.2.1
4.13.2.2
4.13.3 Outstations that use external warning indicators
4.13.4 Outstations with audio frequency induction loops [Go to Page]
Figure 2 — Measuring field strength – Plan view
Figure 3 — Measuring field strength – Side view
4.14 Outstation environmental requirements [Go to Page]
4.14.1
4.14.2
4.14.3
4.15 Wireless-linked EVC systems [Go to Page]
4.15.1
4.15.2
4.15.3
4.15.4
4.15.5
4.15.6
4.15.7
4.15.8
4.15.9
4.16 Marking [Go to Page]
4.16.1
4.16.2
5 Tests [Go to Page]
5.1 General [Go to Page]
5.1.1 Standard atmospheric conditions for testing [Go to Page]
5.1.1.1
5.1.1.2
5.1.2 Specimen configuration
5.1.3 Mounting and orientation of specimen
5.1.4 Electrical connection [Go to Page]
5.1.4.1
5.1.4.2
5.1.4.3
5.1.5 Test specimens
5.2 EVC audio performance tests [Go to Page]
5.2.1 Components
5.2.2 Preparation of the specimen [Go to Page]
5.2.2.1
5.2.2.2
5.2.2.3
5.2.3 Test procedure [Go to Page]
5.2.3.1 Apparatus [Go to Page]
5.2.3.1.1
5.2.3.1.2
5.2.3.1.3
5.2.3.1.4
5.2.3.2 Test method for Type A outstations from EVCIE master handset [Go to Page]
Figure 4 — Setup for Type A outstation
5.2.3.2.1
5.2.3.2.2
5.2.3.2.3
5.2.3.2.4
5.2.3.2.5
5.2.3.3 Test method for Type B outstations from EVCIE master handset [Go to Page]
Figure 5 — Setup for Type B outstation
5.2.3.3.1
5.2.3.3.2
5.2.3.3.3
5.2.3.3.4
5.2.3.3.5
5.3 EVCIE environmental tests [Go to Page]
5.3.1 Environmental test schedule for EVCIE [Go to Page]
Table 1 — Environmental test schedule for EVCIE
5.3.2 Environmental functional tests for EVCIE [Go to Page]
5.3.2.1 General
5.3.2.2 EVC system function [Go to Page]
5.3.2.2.1
5.3.2.2.2
5.3.2.3 Fault warning condition
5.3.3 Cold (operational) [Go to Page]
5.3.3.1 General
5.3.3.2 Initial examination
5.3.3.3 Preparation of the specimen [Go to Page]
5.3.3.3.1
5.3.3.3.2
5.3.3.4 Conditioning
5.3.3.5 Measurements during conditioning
5.3.3.6 Final examination
5.3.4 Damp heat, steady state (operational) [Go to Page]
5.3.4.1 General
5.3.4.2 Initial examination
5.3.4.3 Preparation of the specimen [Go to Page]
5.3.4.3.1
5.3.4.3.2
5.3.4.4 Conditioning [Go to Page]
5.3.4.4.1
5.3.4.4.2
5.3.4.5 Measurements during conditioning
5.3.4.6 Final examination
5.3.5 Damp heat, steady state (endurance) [Go to Page]
5.3.5.1 General
5.3.5.2 Initial examination
5.3.5.3 Preparation of the specimen
5.3.5.4 Conditioning [Go to Page]
5.3.5.4.1
5.3.5.4.2
5.3.5.4.3
5.3.5.5 Final examination
5.3.6 Impact (operational) [Go to Page]
5.3.6.1 General
5.3.6.2 Initial examination
5.3.6.3 Preparation of the specimen [Go to Page]
5.3.6.3.1
5.3.6.3.2
5.3.6.4 Test procedure
5.3.6.5 Measurements during the test [Go to Page]
5.3.6.5.1
5.3.6.5.2
5.3.6.6 Final examination
5.3.7 Vibration, sinusoidal (operational) [Go to Page]
5.3.7.1 General
5.3.7.2 Initial examination
5.3.7.3 Preparation of the specimen [Go to Page]
5.3.7.3.1
5.3.7.3.2
5.3.7.4 Test procedure
5.3.7.5 Observations during the test
5.3.7.6 Final examination
5.3.8 Vibration, sinusoidal (endurance) [Go to Page]
5.3.8.1 General
5.3.8.2 Initial examination
5.3.8.3 Preparation of the specimen [Go to Page]
5.3.8.3.1
5.3.8.3.2
5.3.8.4 Test procedure
5.3.8.5 Final examination
5.3.9 Electromagnetic compatibility (EMC) immunity tests (operational) [Go to Page]
5.3.9.1
5.3.9.2
5.4 Outstation environmental tests [Go to Page]
5.4.1 Environmental test schedule for outstations [Go to Page]
Table 2 — Environmental test schedule for outstations
5.4.2 Environmental functional tests for outstations [Go to Page]
5.4.2.1 General
5.4.2.2 EVC system function [Go to Page]
5.4.2.2.1
5.4.2.2.2
5.4.3 Cold (operational) [Go to Page]
5.4.3.1 General
5.4.3.2 Conditioning [Go to Page]
5.4.3.2.1
5.4.3.2.2
5.4.3.3 Measurements during conditioning
5.4.3.4 Final examination
5.4.4 Dry heat (operational) [Go to Page]
5.4.4.1 General
5.4.4.2 Conditioning [Go to Page]
5.4.4.2.1
5.4.4.2.2
5.4.4.3 Measurements during conditioning
5.4.4.4 Final examination
5.4.5 Dry heat (endurance) [Go to Page]
5.4.5.1 General
5.4.5.2 Conditioning [Go to Page]
5.4.5.2.1
5.4.5.2.2
5.4.5.3 Final examination
5.4.6 Damp heat, cyclic (operational) [Go to Page]
5.4.6.1 General
5.4.6.2 Conditioning [Go to Page]
5.4.6.2.1
5.4.6.2.2
5.4.6.3 Measurements during conditioning
5.4.6.4 Final examination
5.4.7 Damp heat, steady state (endurance) [Go to Page]
5.4.7.1 General
5.4.7.2 Conditioning [Go to Page]
5.4.7.2.1
5.4.7.2.2
5.4.7.3 Final examination
5.4.8 Damp heat, cyclic (endurance) [Go to Page]
5.4.8.1 General
5.4.8.2 Conditioning [Go to Page]
5.4.8.2.1
5.4.8.2.2
5.4.8.3 Final examination
5.4.9 Sulfur dioxide (SO2) corrosion (endurance) [Go to Page]
5.4.9.1 General
5.4.9.2 Preparation of the specimen
5.4.9.3 Conditioning [Go to Page]
5.4.9.3.1
5.4.9.3.2
5.4.9.4 Final examination [Go to Page]
5.4.9.4.1
5.4.9.4.2
5.4.10 Shock (operational) [Go to Page]
5.4.10.1 General
5.4.10.2 Preparation of the specimen [Go to Page]
5.4.10.2.1
5.4.10.2.2
5.4.10.3 Test procedure [Go to Page]
5.4.10.3.1
5.4.10.3.2
5.4.10.4 Final examination
5.4.11 Impact (operational) [Go to Page]
5.4.11.1 General
5.4.11.2 Preparation of the specimen
5.4.11.3 Test procedure
5.4.11.4 Final examination
5.4.12 Vibration, sinusoidal (operational) [Go to Page]
5.4.12.1 General
5.4.12.2 Preparation of the specimen [Go to Page]
5.4.12.2.1
5.4.12.2.2
5.4.12.3 Test procedure [Go to Page]
5.4.12.3.1
5.4.12.3.2
5.4.12.4 Observations during the test
5.4.12.5 Final examination
5.4.13 Vibration, sinusoidal (endurance) [Go to Page]
5.4.13.1 General
5.4.13.2 Preparation of the specimen [Go to Page]
5.4.13.2.1
5.4.13.2.2
5.4.13.3 Test procedure
5.4.13.4 Final examination
5.4.14 Enclosure protection [Go to Page]
5.4.14.1 General [Go to Page]
5.4.14.1.1
5.4.14.1.2
5.4.14.1.3
5.4.14.2 Preparation of the specimen [Go to Page]
5.4.14.2.1
5.4.14.2.2
5.4.14.3 Conditioning
5.4.14.4 Final examination
Annex A (informative) Explanation of access level [Go to Page]
A.1 General
A.2 Access level 1
A.3 Access level 2
A.4 Access level 3
A.5 Access level 4
Annex B (informative) Optional functions [Go to Page]
Table B.1 — Optional functions of EVC system
Bibliography [Go to Page]

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