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eLibrary >
23/30457697 DC BS 8893. Emergency voice communication (EVC) systems. Components. Specification >
23/30457697 DC BS 8893. Emergency voice communication (EVC) systems. Components. Specification, 2023
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23/30457697 DC BS 8893. Emergency voice communication (EVC) systems. Components. Specification, 2023
- 30457697_Form 36
- 30457697_Text [Go to Page]
- 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
- 3.14 wireless repeater
- 4 Requirements [Go to Page]
- 4.1 Overall system requirements [Go to Page]
- 4.1.1 When a call is initiated, either at an outstation or at an EVCIE, the incoming call warning indication at the receiving end shall operate within 3 s of the initiation.
- 4.1.2 If any outstation is in use, this shall not affect the operation of any other outstation on the system.
- 4.1.3 The path of audio through the EVCIE, either from incoming audio from an outstation to the earpiece of the EVCIE master or from the microphone to the loudspeaker on the outstations, shall have a variation of not more than ±5 dB across the frequen...
- 4.1.4 Where a building has more than one EVCIE master station, only one EVCIE master station shall take control of the system.
- 4.2 Transmission paths [Go to Page]
- 4.2.1 General [Go to Page]
- 4.2.1.1 An EVC system shall be interconnected by at least one of the following methods:
- 4.2.1.2 A fault at any one outstation shall not affect the operation of any other outstation on the system.
- 4.2.1.3 All outstation faults shall be indicated within 100 s of occurrence.
- 4.2.1.4 Any interface which allows non-EVC equipment to connect to the EVC system shall not affect the operation of the EVC system.
- 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 The following controls and indicators shall be provided on the EVCIE to control conversations with outstations.
- 4.4.2 All the indications referred to in 4.4.1 shall be readily distinguishable as to their functions, e.g. “make call”, “accept call” or “outstation off-hook”.
- 4.5 EVCIE fault monitoring and indication [Go to Page]
- 4.5.1 The following conditions shall be monitored and indicated by yellow visual fault indicators, and/or a graphic or alphanumeric display, within 100 s of occurrence of a fault, regardless of whether the EVC system is in EVC mode or non-EVC mode:
- 4.5.2 Where a fault indication is suppressed during emergency use, the indication shall be reasserted within 100 s of cessation of emergency use.
- 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 Power supply equipment, external or included in the EVCIE, shall conform to BS EN 54-4:1998 (incorporating Amendments Nos. 1 and 2).
- 4.8.2 If an EVCIE is supplied with power from power supply equipment contained in a separate enclosure, the connections between the equipment shall be duplicated such that a single open or short circuit in the connections does not completely remove po...
- 4.8.3 All power supplies providing power to any part of the EVC system shall indicate any faults at the EVCIE.
- 4.8.4 Any power supplies shall be appropriately rated to supply the maximum operating load of the EVC system.
- 4.9 Program-controlled EVCIE
- 4.10 EVCIE indicator test
- 4.11 EVCIE mechanical requirements [Go to Page]
- 4.11.1 The EVCIE shall be able to be operated only at access level 2.
- 4.11.2 The degree of ingress protection provided by the EVCIE enclosures shall be not less than code IP3X as defined in BS EN 60529:1992+A2.
- 4.11.3 The enclosure shall have separate entries for LV and ELV cables.
- 4.11.4 Where the EVCIE is used to communicate with outstations:
- 4.11.5 Where audio transducers are outside the master station, the interconnections shall be monitored for open- and short-circuit faults. Any fault shall be indicated by at least the general fault indicator.
- 4.11.6 It shall not be possible to disconnect external audio transducers without the use of tools.
- 4.12 EVCIE environmental requirements [Go to Page]
- 4.12.1 When tested in accordance with each of the following environmental tests, the EVCIE shall pass the environmental functional test in 5.3.2 and shall not show any sign of internal or external mechanical damage:
- 4.12.2 When tested in accordance with 5.3.9, the equipment shall not change state during the test.
- 4.12.3 When tested in accordance with 5.4, the outstation frequency response (see 4.1) shall not vary by more than ±3 dB from that measured in 5.2.
- 4.13 Outstation general requirements [Go to Page]
- 4.13.1 Outstations shall be labelled with instructions on how to initiate a call.
- 4.13.2 The operating voltage shall be extra low voltage (ELV), as defined in BS 7671.
- 4.13.3 When tested in accordance with 5.3.11, the device shall continue to operate. Drainage facilities shall be incorporated in the device if necessary.
- 4.13.4 Jamming of a “call” button or any other means of initiating a call shall not affect the operation of any other outstation on the system.
- 4.13.5 The process for initiating calls shall be as follows, depending on the type of outstation.
- 4.13.6 Outstations shall be identified on the housing or front panel as follows, depending on the type of outstation.
- 4.13.7 Type A outstations, which use a telephone-style handset, shall be provided with full duplex speech communication.
- 4.13.8 Handsets of Type A outstations shall be enclosed in a housing with a door or removable front panel.
- 4.13.9 Type B outstations shall be intercom-style, with a fixed microphone and adjacent loudspeaker.
- 4.13.10 Type C outstations shall meet the requirements specified for both Type A and Type B outstations.
- 4.14 Outstations that receive calls [Go to Page]
- 4.14.1 Where the facility for calls to, as well as from, outstations is required, an audible warning of an incoming call shall be provided at every outstation. The audible warning shall sound continuously or in pulsing mode (sounding for a minimum of ...
- 4.14.2 A red indicator or appropriate text on a graphic or alphanumeric display shall be provided to illuminate, either steadily or in flashing mode, when there is an incoming call.
- 4.15 Outstations that use external warning indicators
- 4.16 Outstations with audio frequency induction loops
- 4.17 Wireless-linked EVC systems [Go to Page]
- 4.17.1 Wireless-linked systems shall meet the following requirements.
- 4.17.2 Cables of antennas, and the associated antennas, shall under transmission be continuously monitored by one of the following means:
- 4.17.3 If the VSWR or bit rate error (see 4.17.2) exceed a threshold set by the manufacturer for resilient communication, a fault shall be indicated at the EVCIE within 100 s of the occurrence.
- 4.17.4 Antennas shall be arranged such that they cannot be disconnected or removed without the use of special tools.
- 4.17.5 A fault indication shall be given within 100 s at the EVCIE master station if no valid transmissions are received from all the wireless-linked components for 2 h.
- 4.17.6 After 30 s of continuous broadband or on frequency interference to the transmitted signal that can compromise the performance of the EVC system, a fault indication shall be given at the master station within a further 100 s. The threshold for d...
- 4.17.7 Wireless-linked systems that utilize single or dual frequency working shall meet the following requirements.
- 4.17.8 If portable devices are connected to the EVC system, they shall display the identity of the outstation or master station that is being received.
- 4.17.9 Where an outstation uses PTT for voice steering, a sign shall be provided to explain to the user how the equipment is to be operated.
- 4.18 Marking [Go to Page]
- 4.18.1 Each component of the EVC system shall be marked with the following information, which shall be visible at access level 1:
- 4.18.2 In order to provide traceability, there shall be a code or number at access level 1 or 2 or 3 that identifies the production period of the EVCIE.
- 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 Unless otherwise stated in a test procedure, the testing shall be performed on the EVCIE after the test specimen has been allowed to stabilize in the standard atmospheric conditions for testing as described in BS EN 60068-1, as follows:
- 5.1.1.2 The temperature and humidity shall be substantially constant for each environmental test where the standard atmospheric conditions are applied.
- 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 If the test procedure requires the specimen to be in the operating condition, it shall be connected to a power supply conforming to BS EN 54-4:1998 (incorporating Amendments Nos. 1 and 2).
- 5.1.4.2 Unless otherwise specified, the power supply shall be in the nominal operating condition.
- 5.1.4.3 All transmission paths shall be connected as specified by the manufacturer.
- 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 The specimen shall be mounted in accordance with 5.1.3 and connected in accordance with 5.1.4.3.
- 5.2.2.2 The specimen shall be tested in the quiescent condition.
- 5.2.2.3 The conditions as specified in BS EN 60268-4:2018, 12.1.2 shall be applied at the EVCIE microphone with an angle of incidence of 0 .
- 5.2.3 Test procedure [Go to Page]
- 5.2.3.1 Apply acoustical sinusoidal signals at a level of 70 dB in the frequency range 200 Hz to 10 kHz in steps of 1/3 octaves to the EVCIE microphone for a duration long enough to measure the RMS signal level at the output of the EVCIE. For each fre...
- 5.2.3.2 Measure the signal level at the EVCIE speaker or handset at the 1/3 octave centre frequency for each of the sinusoidal signals applied to the outstation microphone. These levels shall be measured in accordance with BS EN 60268-7:2011+A1, 8.6 f...
- 5.2.3.3 The EVCIE handset/microphone to outstation and the outstation to EVC system handset/speaker paths shall be measured in accordance with Annex C.
- 5.3 EVCIE environmental tests [Go to Page]
- 5.3.1 Environmental test schedule
- 5.3.2 Environmental functional tests [Go to Page]
- 5.3.2.1 General
- 5.3.2.2 EVC system condition [Go to Page]
- 5.3.2.2.1 Initiate a call from an outstation, answer from an EVCIE master station, place on hold and cancel the call. Perform this process on each type of outstation provided.
- 5.3.2.2.2 Check that the correct indications, tones and speech are given.
- 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 Mount the specimen as specified in 5.1.3 and connect it to a suitable power supply as specified in 5.1.4.
- 5.3.3.3.2 The specimen shall be tested in the quiescent condition.
- 5.3.3.4 Conditioning
- 5.3.3.5 Measurements during conditioning
- 5.3.3.6 Final measurements
- 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 Mount the specimen as specified in 5.1.3 and connect it to a suitable power supply as specified in 5.1.4.
- 5.3.4.3.2 The specimen shall be tested in the quiescent condition.
- 5.3.4.4 Conditioning [Go to Page]
- 5.3.4.4.1 Apply the following conditioning:
- 5.3.4.4.2 To prevent the formation of water droplets on the specimen, bring the specimen slowly up to the conditioning temperature (40 ±2) C until temperature stability has been reached.
- 5.3.4.5 Measurements during conditioning
- 5.3.4.6 Final measurements
- 5.3.5 EVCIE 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 [Go to Page]
- 5.3.5.3.1 Mount the specimen as specified in 5.1.3.
- 5.3.5.3.2 The specimen shall not be supplied with power during the conditioning.
- 5.3.5.4 Conditioning [Go to Page]
- 5.3.5.4.1 Apply the following conditioning:
- 5.3.5.4.2 To prevent the formation of water droplets on the specimen, bring the specimen slowly up to the conditioning temperature (40 ±2) C until temperature stability has been reached.
- 5.3.5.5 Final measurements
- 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 Mount the specimen as specified in 5.1.3 and connect it to a suitable power supply as specified in 5.1.4.
- 5.3.6.3.2 The specimen shall be tested in the quiescent condition.
- 5.3.6.4 Test procedure [Go to Page]
- 5.3.6.4.1 Apply impacts at an energy level of (0.5 ±0.04) J to all surfaces of the specimen that are accessible at access level 1. For all such surfaces, apply three blows to the weakest point(s) as agreed with the manufacturer.
- 5.3.6.4.2 Any damage caused by any previous impacts (see 5.3.6.4.1) shall be rectified before continuing with the next set of impacts.
- 5.3.6.5 Measurements during the test
- 5.3.6.6 Final measurements
- 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 Mount the specimen as specified in 5.1.3 and BS EN 60068-2-47, and connect it to a suitable power supply as specified in 5.1.4.
- 5.3.7.3.2 The specimen shall be tested in the quiescent condition.
- 5.3.7.4 Test procedure [Go to Page]
- 5.3.7.4.1 Subject the specimen to vibration in each of the three mutually perpendicular axes in turn, one of which is perpendicular to the plane of mounting of the specimen, using the following parameters:
- 5.3.7.5 Measurements during conditioning
- 5.3.7.6 Final measurements
- 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 Mount the specimen as specified in 5.1.3 and BS EN 60068-2-47.
- 5.3.8.3.2 The specimen shall not be supplied with power during the test.
- 5.3.8.4 Test procedure
- 5.3.8.5 Final measurements
- 5.3.9 Electromagnetic compatibility (EMC) immunity tests (operational) [Go to Page]
- 5.3.9.1 The following EMC immunity tests shall be performed on the EVCIE, as described in BS EN 50130-4:2011+A1:
- 5.3.9.2 For the tests described in 5.3.9.1a) to g), the conditions and processes specified in BS EN 50130-4:2011+A1 and the following shall be met.
- 5.4 Outstation environmental tests [Go to Page]
- 5.4.1 Outstation sulfur dioxide corrosion (endurance) [Go to Page]
- 5.4.1.1 Reference
- 5.4.1.2 Preparation of the specimen [Go to Page]
- 5.4.1.2.1 The specimen shall have un-tinned copper wires, of the diameter specified by the manufacturer, connected to sufficient terminals to allow the environmental functional test given in 5.3.2 to be performed after conditioning without making furt...
- 5.4.1.2.2 The specimen shall not be supplied with power during the conditioning.
- 5.4.1.3 Conditioning
- 5.4.1.4 Final measurements
- 5.4.2 Ingress protection [Go to Page]
- 5.4.2.1 General
- 5.4.2.2 Initial examination
- 5.4.2.3 Preparation of the specimen [Go to Page]
- 5.4.2.3.1 Mount the specimen as specified in BS EN 60529:1992+A2.
- 5.4.2.3.2 The specimen shall not be supplied with power during the conditioning.
- 5.4.2.4 Conditioning
- 5.4.2.5 Final measurements
- 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
- Annex C (normative) Method for measuring system audio bandwidth [Go to Page]
- C.1 Apparatus [Go to Page]
- C.1.1 Signal generator and optional amplifier, to drive a loudspeaker/ transducer
- C.1.2 Loudspeaker/transducer.
- C.1.3 At least one sound level meter, class 1 set to c weighting.
- C.1.4 Enclosure or separate acoustic chambers, for housing the sending and receiving signals.
- C.2 Test method for Type A outstations from EVCIE master with handset [Go to Page]
- C.2.1 Set the signal generator to feed a loudspeaker/transducer with sine wave signals at the ISO 1/3 octave centre frequencies between 200 Hz and 10k Hz.
- C.2.2 Adjust the amplitude of the generator such that the sound level of the signal is a constant 70 dB at the microphone entrance at a distance of 30 mm.
- C.2.3 Measure the resultant audio output at 30 mm away from the handset speaker at an angle of 0 (on axis), and record the result for each of the ISO 1/3 octave bands.
- C.2.4 Repeat the procedure in C.2.1 to C.2.3 with the audio path reversed.
- C.3 Test method for Type B outstations from EVCIE master with handset [Go to Page]
- C.3.1 Set the signal generator to feed a loudspeaker/transducer with sine wave signals at the ISO 1/3 octave centre frequencies between 200 Hz and 10k Hz.
- C.3.2 Adjust the amplitude of the generator such that the sound level of the signal is a constant 70 dB at the microphone entrance at a distance of 30 mm from the handset microphone and 300 mm from the entrance of the Type B microphone.
- C.3.3 Measure the resultant audio output at 30 mm away from the handset speaker or 300 mm from the speaker of the Type B outstation, at an angle of 0 (on axis), and record the result for each of the ISO 1/3rd octave bands.
- C.3.4 Repeat the procedure in C.3.1 to C.3.3 with the audio path reversed. [Go to Page]
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