Design & Installation Guide

Voice Alarm
Design & Installation Guide
This guide is aimed at supporting

designers on Voice Alarm (VA) and
Public Address (PA) systems and their
use in conjunction with advanced fire
detection systems.
Incorporating the requirements of
BS 5839 Part 8: 2013. It highlights some
of the main considerations in system
design. This guide is intended as an aid
and there is no substitute for reading
the full standard.
Contents
Voice Alarm System Design
4.
Regulations for Voice Alarm
5.
Why do we need Voice Alarm
8.
Customer Requirements
11. System Architecture
Loudspeaker Design
17. Loudspeaker Layout
19. Loudspeaker Types
24. Loudspeaker Settings
Checklist for designing

Voice Alarm Systems
VA System Design Checklist
To achieve the right VA design a number of
simple steps need to be followed. This guide
leads you through the steps in a sequence that
will deliver a good design.
Regulations for Voice Alarm

Why do we need Voice Alarm?
Voice Alarm System Selection
Management of Evacuation
Voice Alarm System Types
Voice Alarm and Public Address
Microphones and other inputs
Background Music and Entertainment
Messages
System Architectures
Loudspeaker Design
VOICE ALARM DESIGN & INSTALLATION GUIDE
Regulations for
Voice Alarm
There is no substitute for a sound knowledge
of the standards. BS 5839 Part 8: 2013 is the
code of practice covering the requirements for
the design, installation, commissioning and
maintenance of Voice Alarm Systems.
It sets out in great detail the steps that should be

followed to achieve a system meeting the needs
of the application. This guide does not attempt to
cover all of the detail of the standard but does set
out to highlight the key considerations.
Other standards are also relevant and should be
consulted:
BS EN 5839 Part 1
Design, Installation, Commissioning and
Maintenance fire detection and alarm systems
BS EN 54 Part 16
Design of Voice Alarm Control and
Indicating equipment
BS EN 54 Part 24
Requirements for the design and construction of
Loudspeakers
BS 7827
Code of practice for sound systems at
sports venues
4
Why do we need Voice

Alarm?
Voice Alarm is the future for Fire Alarm Systems
There is some well documented research1 2 into
the behaviour in the event of fire. Most striking is
the variation in the response to alarm signals:
13% of people react in a timely

manner to bells
45% of people react to text

information
75% of people react in a timely

manner to voice messages
Whats that noise?
Further research shows that

peoples behaviour varies
dependant on the environment,
and in an emergency may exit the
building using the same door they
used to enter. The use of a clear
voice message greatly increases
response time and provides the
opportunity to advise occupants of
the safest emergency route.
Im out of here!
Fire! Please leave the

building immediately
*Source of research data

1: Guylne Proulx, Ph.D,Misconceptions about human behaviour in fire emergencies published in
Canadian Consulting Engineer, March 1997, pp36, 38.
2: David Cantor, Studies of Human Behaviour in Fire: Empirical results and their implications for
education and design. Published by BRE, July 1985.
Checklist Management
of Evacuation
Before deciding on a VA System design the
evacuation requirements of the building must be
established
- Is the building to be
evacuated all at once
(one out all out)?
- or does the building
require a phased
evacuation plan?
l
In the example
opposite only part
of the building
is evacuated
immediately
Whilst other areas
will have an alert or
standby message
Note: For the Voice Alarm

System only 3 circuits are
needed to allow separate
messages to be broadcast
simultaneously.
FRONT OFFICE
Public bar
Bar & Store
ALARM ZONE 1
Alarm zone 2
Alarm zone 2
CIRCUIT 1
Circuit 2
Circuit 2
Public lounge
Staff room
Alarm zone 3
Alarm zone 3
Circuit 3
Circuit 3
LOUDSPEAKER
CIRCUIT
LOCATION
VA ZONE
Office
Bar
Bar store
Lounge
Saff room
Voice Alarm System Types?

Once the evacuation strategy of the building is
understood, the designer should assess the type
of voice alarm system that should be used.
The level of manual control and the need for live
messages versus automated messages will drive
the decision on the type of system installed. BS
5839 Part 8 defines 5 types of systems and these
are summarised below:
Types of Systems
Type V3: Zonal live emergency

messages
Type V1: Automatic evacuation
In addition to the functions of the

Type V2, the facility to broadcast live
emergency messages in pre-determined emergency zones, or groups of
zones. This allows evacuation control in
specific areas of the building where a
pre-determined evacuation plan might
not cover all eventualities.
This system offers automatic operation

of the voice alarm system against
a pre-defined evacuation plan. The
system may also have facilities for the
manual operation of non-fire emergency messages, provided that these are
automatically overridden by emergency
messages.
Type V2: Live emergency

messages
In addition to the automatic facilities
provided by the Type V1 system, the
Type V2 system provides the facility
for automatic message initiation as
well as the facility to broadcast live
emergency messages by means of an
all-call emergency microphone situated
at a strategic controlpoint. This allows
supplementary live announcements to
aid safe evacuation.
Type V4: Manual controls

Type V4 system has the facility to
select and direct stored emergency
messages to individual zones as well
as the ability to disable or enable
emergency broadcast messages and
display their status. This allows a well
trained and disciplined staff to follow
a pre-planned evacuation strategy
when the automatic mode needs to be
overridden.
Type V5: Engineered systems

Where the application falls outside the
scope of type V1-V4, a type V5 system
allows the design of a tailored solution
based on the assessment of special or
mutable risks.
Checklist Customer
Requirements
Voice Alarm and Public Address?
Is the system to be used only for Voice Alarm or a
combination of Voice Alarm and Public Address,
and maybe even music?
If so, the zoning requirements for Voice Alarm Evacuation may be different
from Public Address.
l
In the example shown

opposite there is a
requirement for 3
separate paging zones
and 2 areas for music,
aswell as 3 alarm zones.
However there are only
2 evacuations zones.
Front Office
Public bar
Bar & Store
Alarm
zone 1
Paging
No music
Circuit 1
Alarm zone 2
Music
No paging
Circuit 2
Alarm zone 2
Paging
No music
Circuit 3
Public
lounge
Staff room
Note: For the Voice Alarm System

only 3 circuits are needed to
allow separate messages to be
broadcast simultaneously. However
once the PA and background
music requirements are added the
minimum number of circuits required
increases to 5.
LOUDSPEAKER LOCATION
CIRCUIT
Alarm zone 3
Music
No paging
Circuit 4
VA ZONE
PA ZONE
Office
Bar
Bar store
Lounge
Saff room
Alarm zone 3
Paging
No music
Circuit 5
MUSIC
1
2
2
3
Checklist For designing

Voice Alarm Systems
Microphones & Other Inputs
How many microphones are needed and what
are they used for?
Microphones may be used to

broadcast live messages both in
an emergency and in normal public
address.
Examples include:
For emergency use, microphones

must be operated and be monitored
in accordance with BS 5839 Part 8,
and be certified to the requirements
of EN54-16.
Identify opportunities to broadcast
miscellaneous announcements.
Spot announcements
General paging
Landlord input in shopping

centres
l Adverts
l
Pre-recorded messages on a PC
Audio visual presentations
Background Music and
Entertainment
Does the system need music, if so
how many sources and how is it to
be routed?
Different areas of a building may
need to be linked to entertainment
systems. You need to identify the
type and location of the music
source eg. CD Player, Satellite TV,
HiFi System etc.
Checklist Messages
What messages do I need to meet the needs
of the building?
Recommended messages are defined in
the standards, and meet the needs of most
buildings.
In some cases messages may be tailored to suit special applications and

may even involve coded alerts to warn staff ahead of the public.
RECOMMEND SEQUENCE OF MESSAGE AND TONE

ATTENTION-DRAWING SIGNAL
lasting 2 s to 10 s followed by
BRIEF SILENCE
lasting 1 s to 2 s followed by
EVACUATE MESSAGE
followed by
SILENCE
lasting 2 s to 5 s
Example of an evacuate
message:
Attention, please. Attention,

please. Fire has been
reported in the building.
Please leave the building
immediately, by the nearest
exit. Do not use a lift.
10
Example of an alert message:
May I have your attention,

please. May I have your
attention, please. Fire
has been reported in the
building. Please listen for
further instructions.
Checklist
System Architectures
Architecture Centralised or Distributed
The system architecture may be selected to
suit the building.
Some of todays solutions
Voice sounders
Three main variations of providing

voice messages are available today,
these are:
Although these devices can not be

considered a true VA they do offer
voice messages, with each device
containing a memory chip that has
a number of pre-recorded standard
messages, that are operated direct
from the fire alarm control panel.
Stand Alone Voice sounders
Central Rack Systems
Distributed Rack Systems
All these types have possible use

dependant on the type and size of
the building where they are being
installed.
It is important that the control panel

has a synchronisation capability
so all the independent recorded
messages are delivered at the
same time.
11
Central Rack Systems

Central Rack Systems consist of a rack of
amplifiers that control all the loudspeaker circuits
that are radially wired as shown. This rack
can also contain facilities for zone selection,
music input, emergency and general paging
announcements.
Considerations when
using rack systems:
Sounders
12
The link between

the fire control
panel and the
rack must be fully
protected and
monitored
The correct
cables sizes must
be provided for
the loudspeaker
circuits particularly
if they extend
across many floors
The battery
standby capacity
must be properly
calculated with
some capacity to
extend in the future
Fire Loop
Control
Rack System
Fire Control
Panel
Distributed Rack Systems

Distributed Rack Systems are the latest
innovation that allow the loudspeakers to be
connected to local amplifiers often connected on
the fire system loop cables, as shown.
Fibre Optic
Graphical
Management
NETWORK
CD Player
Configuration
The benefits of this approach are:

l
There is a lot less cable required for the loudspeaker circuits
Shorter cable runs to localized racks
The cables will often be smaller in size and therefore cost less
l The
system can easily be extended as additional Distributed Racks can

be added to the Voice Alarm network
13
Loudspeaker Design
What you need to know...
Which loudspeaker should I use?
There are potentially several ways of providing
intelligible coverage for any particular space.
The selection of the type, quantity,

location and orientation of
loudspeakers is a critical part of
voice alarm system design and is
based on information about the use
of the building such as:
14
Acoustic environment
- floor plans
- building sections
- material finishes
- reverberation time
Ambient noise level
Climatic environment
Area coverage requirement
Mounting arrangements, for

example ceiling tiles, wall, pole
etc.
Architectural design and

relevance of the appearance of
the loudspeaker
Type of broadcast, i.e. if it is used

for purposes other than voice
alarm, such as commentary,
background music etc.
Inter-relationship between
loudspeaker
zones and fire compartments
Loudspeaker Layout/
Placement
The best loudspeaker layout should give an
even spread of sound within a room
This may mean using more loudspeakers at
lower sound pressure levels rather than one
very loud one!
Bad
A single loudspeaker at a high setting will give a poor sound distribution.
SPL dB
A number of loudspeakers distributed evenly will give a better distribution

and a better quality of sound.
Bad
Bad
Too Loud
SPL dB
SPL
d8
Too Quiet
Too Loud
Too Quiet
Too Loud
SPL dB
SPL
dB
SPL
d8
Good
distribution
Good distribution
Good distribution
15
Checklist For
Loudspeaker Design
BS5839 Part 8: 2013 takes a more prescriptive
approach than in previous editions providing
simple loudspeaker spacing guidelines for
designers.
In simple acoustic spaces, a

competent person can estimate
types, quantities and locations of
loudspeakers required, using the
above information.
There is a straight forward

sequence to follow to arrive at a
suitable loudspeaker design.
1 Decide loudspeaker layout / placement

2 Select loudspeaker types
3 Define setting for each loudspeaker
3.1 4 Assess background noise levels
3.2 4 Decide spacing and tappings
3.3 4 Calculate SPL required from loudspeaker
3.4 4 Calculate loudspeaker load
16
Checklist For
Loudspeaker Design
A distributed system will suit most common
applications:
Offices
Shell and core building systems
Classrooms
Shop units
Plan
view
with
ceiling
speakers
Plan
view
with
ceiling
loudspeakers
Plan view with ceiling speakers
Plan view with ceiling speakers
Loudspeakers spaced
at regular intervals
deliver an even
distribution of sound.
Listener ear level
should be higher than
1.2m unless its a child
or very small person.
End view of ceiling speakers
End view of ceiling loudspeakers

Wall loudspeakers
may be used as an
alternative distributed
layout for high ceiling
areas.
17
Alternative Loudspeaker
Layout Options
Centralised Design and Hybrid

or Combined Design
In certain
circumstances a
centralised design
is better suited for
example in large open
areas.
Combined
In other circumstances
a hybrid of centralised
and distributed layout
may be required.
18
Loudspeaker Selection
Ceiling loudspeakers
This type of loudspeaker is ideal for open plan
offices with false (suspended) ceilings.
Ceiling loudspeakers can give very

good music reproduction and are
often used in low level multipoint
systems where each loudspeaker
is tapped at a low level to provide
a smooth and even distribution
of sound throughout the area of
coverage.
Installations with a large number
of ceiling loudspeakers (in an
open-plan office, for example) will
have them set in a grid pattern to
maximize the coverage provided.
Ceiling loudspeakers come in a
range of diameters and are typically
rated at a maximum of 6 watts.
Cabinet loudspeakers
A cabinet loudspeaker provides
general coverage within a room of
limited size.
Cabinet loudspeakers are suitable
for paging announcements in small,
quiet offices. Alternatively a number
of suitable cabinet loudspeakers
can be used in larger office areas to
provide sufficient coverage.
Cabinet loudspeakers may also
be used as ceiling loudspeakers
where a suspended ceiling is not
available.
19
Horn loudspeakers
Horn loudspeakers have two main attributes: they
are weatherproof and are able to direct sound in
a well defined pattern. Compact and sturdy
re-entrant types (folded internally to make the
unit shorter) are the most common types.
Due to their restricted low frequency

response, they should be used
only for speech applications and
amplifier high-pass filtering must be
selected. If horn loudspeakers are
fed with low frequencies there is a
risk of damage to the loudspeaker
diaphragms.
20
Projector loudspeakers
Projectors are more directional than
cabinet loudspeakers but have
better musicality than a horn.
The highly directional characteristic
of projectors can be useful in saving
amplifier power, in areas such as
railway stations, a noisy machine
shop, car parks and shopping
centres.
Column loudspeakers
Column loudspeakers consist of a number of
drive units arranged in a vertical pattern and
are usually confined to sound reinforcement
applications rather than distributed P.A. systems.
They are designed to have a very

wide sound dispersion (radiation
pattern) in a horizontal plane (from
side to side) and narrow dispersion
in the vertical plane.
This makes them effective in areas
with difficult sound characteristics
such as churches, auditoria, railway
stations and airports.
Spherical loudspeakers
Ideal for open areas with high
ceilings such as retail units. Sound
is distributed around 360 degrees
and the sphere is suspended at a
convenient height above the floor.
With good sound reproduction
quality they are useful for voice and
music in difficult applications.
21
Loudspeaker Design Siting of Ceiling Speakers
Ceiling loudspeaker mounted

in suspended
ceiling
in suspended ceiling
60 degrees
Approx at 4kHz
Layout/Placement
Where ceiling
loudspeakers are
to be mounted in a
suspended ceiling
they are to be mounted
on a square grid.
Ceiling loudspeakers
shall be mounted at
a maximum of 6m
spacings to comply
with the requirements
of BS5839-8: 2013.
1.2m

in
suspended
ceiling Loudspeaker
Loudspeaker
spacing
spacing
in suspended ceiling
Listener ear level
should be higher than
1.2m unless its a child
or very small person.
Spacing
6m
D = 6m at 3m ceiling height
22
Loudspeaker Options
Cabinet loudspeakers layout
Layout/Placement
Loudspeakers are to
be wall mounted, they
should be fitted at a
height of 2.5m to 3m
and spaced 6m apart
along the wall.
6m
6m
As general guidance, in rooms less than 6m

As
guidance,
in rooms
lessless
than
6m wide,
As general
general
guidance,
rooms
than
6monly.
wide,
wide,
cabinets
can beinfitted
along one
wall
cabinets can be fitted along one wall only.
cabinets
can
beloudspeakers
fitted along one
wallbeonly.
Above
6m
the
should
fitted
Above 6m the loudspeakers should be fitted
to to
Above 6mwalls
the loudspeakers should be fitted to
opposing
walls.
opposing
opposing walls
6m or less
Power settings should

be set to give 10dB
above the background
at the furthest point
from the loudspeaker.
Take care not to
position loudspeakers
opposite each other,
the sound coverage
and intelligibility in the
area mid-way between
them will not be
optimal.
6m or less
23
Define Loudspeaker
Settings
As well as layout, an intelligible Voice Alarm
System is dependant on the sound level of the
broadcast message.
Calculate Sound
Pressure Level
(SPL) required from
each loudspeaker
Step 1: Assess
background noise
The Sound Pressure
Level (SPL) required
depends greatly on
the background noise
levels.
Typically the System
design should aim to
deliver SPL at around
10dB above ambient.
Sound Pressure Level
140
120
110
Pop Group
100
Heavy Truck
Pneumatic Drill
90
80
70
Conversational
Speech
60
50
Library
Street road traffic
Business Office
Living Room
40
30
Bedroom
20
The table gives some

typical sound levels in
different environments.
10
0
NOISE
24
dB Threshold of Pain
130
Woods
Threshold of Hearing
Define Loudspeaker
Settings
Calculate SPL required from Loudspeaker
Step 2: Sound pressure level
Sound pressure falls off rapidly with distance and
there is a loss of 6dB every time the distance
doubles.
To achieve the desired sound pressure at a certain distance away from the
loudspeaker, the loss must be calculated.
Reduction
in DB (A)
Effect of distance on sound level

20
9.2
12
13.9
15.5
16.9
18
19
10
20
Reduction in DB (A)
Distance from
source (m)
15
10
0
1
10
Distance from source
Example
Distance from loudspeaker
4m
Ambient noise level
61 dBA
Target SPL (6ldb+10db)
71 dBA
DB loss over 4m
12 dBA
Loudspeaker setting at 1m
At least 83 dBA at 1m
25
Define Loudspeaker
Settings
Calculate SPL required from
each Loudspeaker
Step 3: Loudspeaker tapping

Once the sound pressure level
is known, the tap setting of the
Loudspeaker can be defined.
Loudspeaker data sheets give the
power needed to achieve the SPL
at 1m.
The table below can also be used to

define typical tap settings for ceiling
Loudspeakers at different ceiling
heights.
Typical Tap Settings

Background Noise (SPL set to 10dB higher)
26
Ceiling Height
65dB
70dB
75dB
80dB
85dB
90dB
2.5
0.75
0.75
0.75
0.75
1.5
3.0
0.75
0.75
0.75
1.5
3.5
0.75
0.75
0.75
4.0
0.75
0.75
1.5
4.5
0.75
0.75
5.0
0.75
0.75
5.5
0.75
1.5
Loudspeaker Design Amplifier Loading

What size amplifier do I need?
Calculate loudspeaker load: for each circuit
Once you have determined each

individual Loudspeaker tapping,
the total load for each Loudspeaker
circuit can be calculated.
Add 20% for minimum size of

amplifier needed (account for
efficiency losses on amplifier and
cable).
By adding the power requirement

for every Loudspeaker the total load
for the Amplifier is calculated.
Amplifier
r
1.5W
3W
6W
3W
12 x 1.5W + 5x3W + 1x6W= 36W load

+20% = 8W
Total Power = 44W
27
Product range
Honeywell has a VA solution for all types of
buildings and with our team of experts to support
you every step of the way, its never been easier
to work with our products.
Three types of systems are
available including small Stand
Alone packages suitable for single
storey buildings such as shops
and offices and move up to custom
made Networked Systems
that will consist of a number of

systems linked together for large
structures such as exhibition halls
and airports.
Loudspeakers
Support
Our full range of loudspeakers

complies with BS5839 part 8 and
EN54 part 24 and includes:
We offer a full Voice Alarm Support

Service including:
5 and 6.5 Ceiling Loudspeaker
System design
6W Cabinet Loudspeaker
10W and 20W Unidirectional

Projection Loudspeaker
Acoustic design support and

modelling (where required)
Loudspeaker layouts
20W Bidirectional Projection

Loudspeaker
Rack build
Commissioning support
Factory acceptance testing
20W and 40W Column

Loudspeaker
Honeywell Life Safety Systems

Tel: +44 (0) 116 246 2000
Fax: +44 (0) 116 246 2300
Email: HLSUKsalessupport@honeywell.com
140 Waterside Road
Hamilton Industrial Park
Leicester
LE5 1TN
www.honeywellvoicealarm.com
l Training
l
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Voice Alarm

Design & Installation Guide

This guide is aimed at supporting

Regulations for Voice Alarm

Why do we need Voice Alarm

11. System Architecture

Checklist for designing

Regulations for Voice Alarm

VOICE ALARM DESIGN & INSTALLATION GUIDE

It sets out in great detail the steps that should be

Why do we need Voice

13% of people react in a timely

45% of people react to text

75% of people react in a timely

Whats that noise?

Further research shows that

Fire! Please leave the

*Source of research data

Note: For the Voice Alarm

Bar & Store

Voice Alarm System Types?

Type V3: Zonal live emergency

Type V1: Automatic evacuation

In addition to the functions of the

This system offers automatic operation

Type V2: Live emergency

Type V4: Manual controls

Type V5: Engineered systems

In the example shown

Bar & Store

Note: For the Voice Alarm System

Checklist For designing

Microphones may be used to

For emergency use, microphones

Landlord input in shopping

Audio visual presentations

In some cases messages may be tailored to suit special applications and

RECOMMEND SEQUENCE OF MESSAGE AND TONE

Attention, please. Attention,

Example of an alert message:

May I have your attention,

Some of todays solutions

Three main variations of providing

Although these devices can not be

Stand Alone Voice sounders

Central Rack Systems

Distributed Rack Systems

All these types have possible use

It is important that the control panel

VOICE ALARM DESIGN & INSTALLATION GUIDE

Central Rack Systems

The link between

Distributed Rack Systems

The benefits of this approach are:

There is a lot less cable required for the loudspeaker circuits

Shorter cable runs to localized racks

system can easily be extended as additional Distributed Racks can

The selection of the type, quantity,