CLC/TS 50661-1:2017

Alarm systems - External perimeter security systems - Part 1: System requirements

This European Standard specifies the requirements for External and Perimeter security systems (EPSS)- installed externally using specific or non-specific wired interconnections or wire-free interconnections. These requirements are not intended to apply to security system, e.g. intruder alarms, visual surveillance system (VSS), access control systems installed in buildings. This standard specifies performance requirements for installed EPSS but does not include requirements for design, planning, installation, operation or maintenance. These requirements also apply to EPSS sharing means of detection, triggering, interconnection, control, communication and power supplies with other applications. The operation of a EPSS shall not be adversely influenced by other applications. Requirements are specified for EPSS components where the relevant environment is classified. This classification describes the environment in which a EPSS component may be expected to operate as designed. Requirements for two environmental classes are specified for EPSS components. When the requirements of these two environmental classes are inadequate, due to the extreme conditions experienced in certain geographic locations, special national conditions are also specified in Annex A. Interconnections and products used to combine both an I&HAS and EPSS systems, e.g. control and indicating equipment, should comply to both the IEC 62642 (EN 50131) and EPSS suite of standards. The failure of either system or a fault in either system should not be adversely affect the performance of the other.

Alarmanlagen - Externe Perimeter-Sicherheitsanlagen - Teil 1: Systemanforderungen

Systèmes d'alarme - Systèmes de sécurité de périmètre externes - Partie 1: Exigences système

Alarmni sistemi - Sistemi za varovanje zunanjih meja - 1. del: Splošne zahteve

Ta evropski standard določa zahteve za sisteme za varovanje zunanjih meja (EPSS), nameščene zunaj zgradb, ki uporabljajo specifične ali nespecifične ožičene ali brezžične medsebojne povezave. Te zahteve se ne uporabljajo za sisteme za varovanje, npr. alarme za javljanje vloma, sisteme za vizualni nadzor (VSS), sisteme nadzora dostopa, vgrajene v stavbah.
Ta standard določa zahteve glede zmogljivosti nameščenih sistemov za varovanje zunanjih meja, vendar ne vključuje zahtev za zasnovo, načrtovanje, namestitev, upravljanje ali vzdrževanje.
Te zahteve veljajo tudi za sisteme za varovanje zunanjih meja, ki si z drugimi aplikacijami delijo sredstva za zaznavanje, sprožanje, medsebojno povezovanje, nadzor, komunikacijo in napajanje. Druge aplikacije ne smejo negativno vplivati na delovanje sistema za varovanje zunanjih meja.
Zahteve so določene za komponente sistema za varovanje zunanjih meja, pri katerih je klasificirano okolje uporabe. Taka klasifikacija opisuje okolje, v katerem komponente sistema za varovanje zunanjih meja delujejo v skladu s svojo zasnovo.
Za komponente sistema za varovanje zunanjih meja so določene zahteve za dva okoljska razreda. Če zahteve teh dveh okoljskih razredov ne zadostujejo zaradi ekstremnih pogojev na nekaterih geografskih območjih, se lahko uporabijo tudi posebni nacionalni pogoji, opredeljeni v dodatku A.
Medsebojne povezave in proizvodi, ki se uporabljajo za združevanje sistemov I&HAS in sistemov za varovanje zunanjih meja, npr. nadzorna in indikatorska oprema, morajo izpolnjevati zahteve standarda IEC 62642 (EN 50131) in zahteve skupine standardov za sisteme za varovanje zunanjih meja. Nedelovanje ali okvara katerega koli sistema ne sme negativno vplivati na delovanje drugega sistema.

General Information

• Status: Published
• Publication Date: 07-Sep-2017
• ICS: 13.320 - Alarm and warning systems
• Technical Committee: CLC/TC 79 - Alarm systems
• Drafting Committee: CLC/TC 79/WG 01 - Intruder & hold-up alarm systems
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 08-Sep-2017
• Due Date: 04-Oct-2017
• Completion Date: 08-Sep-2017
• Ref Project: SIST-TS CLC/TS 50661-1:2017 - Alarm systems - External perimeter security systems - Part 1: System requirements

Overview

CLC/TS 50661-1:2017 - Alarm systems - External perimeter security systems (EPSS) - Part 1: System requirements - is a CENELEC technical specification that defines performance and system-level requirements for external and perimeter security systems installed outside enclosed buildings. It applies to wired and wire-free interconnections and to EPSS components classified by environmental conditions. The document establishes a framework (including four self‑protection grades, four environmental classes and four performance categories) to guide future EPSS parts such as application guidelines and detector component standards.

Key topics and technical requirements

• Scope and intent: Specifies performance requirements for installed EPSS but does not cover design, planning, installation, operation or maintenance.
• System structure & functions: Describes EPSS central functions, transceivers, user interfaces, power supply and interconnections.
• Grading & environmental classification: Defines grading and environmental classes to match components to operating conditions; Annex A addresses special national conditions.
• Detection and events: Covers concepts such as areas, layers, zones, detectors, detection points, alarm and fault conditions, disqualification and dynamic tracking functions.
• Interconnections & communications: Requirements for availability, monitoring and security of communication paths between EPSS components and alarm receiving centres (ATS/ARC).
• Power supply & fault handling: Specifies alternative power sources, fault detection and resilience expectations for EPSS operation.
• Processing, notifications and user control: Event processing, system notification, access levels, user administration and event recording are addressed at system level.
• Coexistence with other systems: EPSS that share detectors, power, control or communications with other systems must not have their operation adversely affected by those applications.

Practical applications

• Perimeter detection for sites: Early warning and intrusion detection along fences, yards, compound perimeters, open storage and unenclosed roofs.
• Integration with physical security: Enhances gates, barriers, lighting and response procedures to form layered perimeter protection.
• Use cases: Industrial sites, utilities, logistics yards, critical infrastructure and any facility where external perimeter monitoring is required.
• Limitations: For enclosed building intruder alarms, EN 50131-1 is the relevant standard; CLC/TS 50661-1:2017 is intended for external areas.

Who should use this standard

• Security system designers and integrators specifying EPSS performance
• Alarm and intruder alarm companies developing external solutions
• Insurers, police and security managers evaluating perimeter protection
• Manufacturers of EPSS components (to align products with environmental classes and grading)

Related standards

• EN 50131-1 / IEC 62642 (EN 50131) - intruder alarm systems for enclosed buildings
• EN 50130-5 - environmental test methods
• EN 50131-6 - power supplies
• EN 50136-1 - alarm transmission systems
• prEN 50398-1:2016 - combined and integrated systems
• EN 50130-4 - EMC susceptibility test conditions referenced

This specification provides the system‑level performance foundation for reliable, application‑driven external perimeter security systems (EPSS).

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2017
Alarmni sistemi - Sistemi za varovanje zunanjih meja - 1. del: Splošne zahteve
Alarm systems - External perimeter security systems - Part 1: System requirements
Alarmanlagen Alarmanlagen - Externe Perimeter Sicherheitsanlagen - Teil 1:
Systemanforderungen
Systèmes d'alarme - Systèmes de sécurité de périmètre externes - Partie 1: Exigences
système
Ta slovenski standard je istoveten z: CLC/TS 50661-1:2017
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC/TS 50661-1

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
September 2017
ICS 13.320
English Version
Alarm systems - External perimeter security systems - Part 1:
System requirements
Systèmes d'alarme - Systèmes de sécurité de périmètre Alarmanlagen Alarmanlagen - Externe Perimeter
externes - Partie 1: Exigences système Sicherheitsanlagen - Teil 1: Systemanforderungen
This Technical Specification was approved by CENELEC on 2017-07-31.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TS 50661-1:2017 E

Contents
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Abbreviations . 12
4 System Structure . 13
4.1 General . 13
4.2 EPSS central functions . 13
4.3 Transceiver . 14
4.4 User interface . 14
4.5 Power Supply . 14
4.6 Interconnections . 14
5 General Requirements, Classifications and Grading . 14
5.1 General . 14
5.2 Grading . 15
5.3 Environmental classification . 16
5.4 Concepts (Area, Layer, Zone, Detector, Detector Point) . 17
5.5 Overview of Intrusion Detection, Tamper, Fault Types . 19
5.6 Documentation and Marking . 19
6 Component Requirements . 20
6.4 Reduction of detection capability. 21
6.5 Fault Detection . 21
7 Interconnections . 22
7.1 General . 22
7.2 Availability of interconnections . 22
7.3 Monitoring of interconnection . 22
7.4 Security of communication . 23
8 System Notification . 23
8.1 General . 23
8.2 ATS Notification . 23
8.3 Audible or other notifications . 23
8.4 Indications . 23
9 System Control Interfaces . 24
10 Power Supply . 24
10.1 Types of power supply . 24
10.2 Requirements . 24
11 Processing . 25
11.1 Modes . 25
11.2 Event processing . 26
11.3 Indications . 28
11.4 Event Recording . 29
12 Operation . 30
12.1 Operation - General . 30
12.2 User Access and User Administration . 31
12.3 Basic Operation . 33
12.4 Advanced Operation . 35
12.5 Automatic Operation . 35
Annex A (normative) Special national conditions . 36
Bibliography . 37

European foreword
This document (CLC/TS 50661-1:2017) has been prepared by CLC/TC 79 “Alarm systems”.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Introduction
This Technical Specification applies to External and Perimeter Security Systems.
This Technical Specification is a specification for External and Perimeter Security Systems (EPSS) to
provide detection of intruders in external areas outside enclosed buildings installed in the perimeter outside
buildings. It includes four self protection grades, four environmental classes and four performance
categories.
At the time of writing there is a desire to develop a series of standards for EPSS. This first version of this
technical specification is intended to create a framework to enable development of the other parts of the
series. In particular this will include the application guidelines and the detector component standards. It is
expected that during the development of these other parts enhancements to the system requirements will be
identified.
The purpose of an EPSS is to enhance the security of the supervised premises. To maximize its
effectiveness an EPSS should be integrated with appropriate physical security devices and procedures. This
is particularly important to higher grade EPSS.
This technical specification is intended to assist insurers, intruder alarm companies, customers, the police
and other relevant organisations in achieving a complete and accurate specification of the supervision
required in particular premises, but it does not specify the type of technology, the extent or degree of
detection, nor does it necessarily cover all of the requirements for a particular installation.
All references to the requirements for EPSS refer to basic minimum requirements and the designers of such
installed EPSS should take into account the nature of the premises, the value of the contents, the degree of
risk of intrusion, the threat to personnel and any other factors which may influence the choice of grade and
performance category of an EPSS.
Recommendations for design, planning, operation, installation and maintenance are given in Application
Guidelines CLC/prTS 50661-7 (to be developed).
This technical specification makes allowance for the EPSS designer to vary the design of the system
according to whether the site is usually staffed when the EPSS is in use or continuously staffed and whether
the staff use an internal monitoring station (see definitions) or response is initiated from an alarm receiving
centre.
In the context of this technical specification “external” refers to an area, which is not wholly enclosed inside a
building, within which it is desired to detect intruders. The perimeter is typically a physical boundary to a site.
In some cases the EPSS may include detection devices outside of the physical boundary (e.g. fence) that
are used to provide an early warning of possible intrusion or in combination with perimeter detection devices
to verify a likely crossing of the perimeter.
This technical specification is not intended to be used for testing individual EPSS components. Requirements
for testing individual EPSS components are given in the relevant component standards (to be developed).
1 Scope
This Technical Specification specifies the requirements for security systems to provide detection of intruders
in external areas outside enclosed buildings.
For enclosed buildings EN 50131-1 should be applied. CLC/TS 50661-1 may be used for unenclosed
buildings such as roofed storage areas where an intruder and hold-up alarm system is not suitable.
This Technical Specification specifies performance requirements for installed EPSS but does not include
requirements for designing, planning, installation, operation or maintenance.
These requirements also apply to EPSS sharing means of detection, interconnection, control, communication
and power supplies with other applications.
This Technical Specification references requirements for system components according to the environment
where they are expected to operate as designed. These environmental conditions are classified.
This Technical Specification does not deal with requirements for compliance with EC regulatory Directives,
such as the RED Directive, EMC Directive, Low Voltage Directive, etc. except that it specifies the equipment
operating conditions for EMC susceptibility testing as required by EN 50130-4.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 50130-5, Alarm systems - Part 5: Environmental test methods
EN 50131-6, Alarm systems - Intrusion and hold-up systems - Part 6: Power supplies
prEN 50398-1:2016, Alarm systems - Combined and integrated systems - Part 1: General requirements
EN 50136-1, Alarm systems - Alarm transmission systems and equipment - Part 1: General requirements for
alarm transmission systems
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
3.1.1
access level
level of access to particular functions of an EPSS
3.1.2
actuator
component (e.g. motor, solenoid) of the EPSS or associated system that causes a change to a mechanism
(e.g. movement, rotation, release of a lock) in response to a control signal or message from the EPSS
3.1.3
alarm
warning of the presence of a hazard to life, property or the environment
3.1.4
alarm condition
condition of an EPSS, or part thereof, which results from the response of the system to the presence of a
hazard
3.1.5
alarm level
alarm level gives an indication for the procedural response by the user weighting the event based factors
with the protection level
Note 1 to entry: This Technical Specification doesn’t specify the procedural response but users should assign an alarm
level for each necessary response.
Note 2 to entry: The assigned response may be different for each zone or layer of the EPSS.
3.1.6
alarm receiving centre
continuously manned centre to which information concerning the status of one or more EPSS is reported
3.1.7
alarm system
electrical installation which responds to the manual or automatic detection of the presence of a hazard
3.1.8
alarm transmission path
route an ATS alarm message travels between an individual EPSS and the annunciation equipment at its
associated ARC
3.1.9
alarm transmission system
equipment and network used to transfer information from one or more EPSS to one or more alarm receiving
centres
Note 1 to entry: Alarm transmission systems exclude local direct connections, i.e. interconnections between parts of an
EPSS which do not require an interface to transform the EPSS information into a form suitable for transmission.
3.1.10
alert indication
audible and/or visual indication, available at access level 1 indicating that further indication(s) are available to
users at access levels 2A, 2B, 3 or 4
3.1.11
alternative power source
power source capable of powering the EPSS for a predetermined time when a prime power source is
unavailable
3.1.12
ancillary control equipment
equipment used for supplementary control purposes
3.1.13
area
independently controlled part of the EPSS (e.g. group of zones, detection points)
3.1.14
authorisation
permission to gain access to the various control functions of an EPSS
3.1.15
authorisation codes
mechanical or logical keys which permit access to EPSS functions
3.1.16
availability of interconnection
condition when an interconnection is capable of conveying a signal or message
3.1.17
controller
equipment that process EPSS information based on predefined rules (e.g. algorithm)
3.1.18
data storage
memory of event data and system configuration settings
3.1.19
demoting
action of either downgrade protection level or unset
decrease of the protection level of all or part of an EPSS
Note 1 to entry demoting may be achieved by changing the status from set to unset.
3.1.20
detection point
smallest monitored element in an EPSS provided by a detector. A detection point has a defined location such
as a volume or section of perimeter
3.1.21
detector
device designed to generate an event in response to the sensing of predefined condition (e.g. presence of a
person)
Note 1 to entry: A detector can provide a number of detection points.
3.1.22
detection point
device designed to generate an event in response to the sensing of predefined condition (e.g. presence of a
person)
Note 1 to entry A detector can provide a number of detection points.
3.1.23
disqualification
fault status due to environmental conditions (e.g. fog for infrared curtains)“ was added
3.1.24
dynamic tracking function
ability to identify and visualize the location and direction of a person/object continuously
3.1.25
entry/exit route
route by which authorised entry or exit to the supervised premises or part thereof may be achieved
3.1.26
event
condition arising from the operation of an EPSS e.g. promoting/demoting or the functioning of an EPSS, e.g.
alarm signal or message
3.1.27
event recording
storage of events arising from the operation e.g. promoting or demoting of an EPSS or the functioning of an
EPSS for future analysis
3.1.28
fault condition
condition of an alarm system which prevents an EPSS or parts thereof from functioning normally
3.1.29
false alarm
triggered alarm caused by unidentified condition (e.g. technical interference)
3.1.30
fault signal/message
information generated due to the presence of a fault
3.1.31
indication
information (in audible, visual or any other form) provided to assist the user in the operation of an EPSS
3.1.32
inhibit
status of a part of an EPSS in which an alarm condition cannot be notified, such status remaining until the
EPSS or part thereof passes from the set to the unset status
3.1.33
interconnection
means by which messages and/or signals are communicated between EPSS components
3.1.34
internal elements
parts of EPSS components located inside the housing of the component (whether or not the component is
located inside or outside a building)
3.1.35
internal monitoring station
staffed facility under the responsibility of the user (e.g. control room)
3.1.36
isolation
status of a part of an alarm system in which an alarm condition cannot be notified, such status remaining
until deliberately cancelled
3.1.37
layer
detection point or aggregation of detection points (see 5.4)
Note 1 to entry: Typically an intruder is expected to pass several layers.
Note 2 to entry: The following layers might exist:
layer 0: outside the perimeter
layer 1: perimeter line (fence)
layer 2: space inside the perimeter excluding the building and layer 3
layer 3: proximity of a building
3.1.38
logical key
information used by an authorized user to gain access to restricted functions or parts of a CIE
EXAMPLE: PIN code, magnetic card or similar, biometric key.
3.1.39
masked
condition whereby a detector cannot function as intended e.g. the field of view of a movement detector is
blocked or the detector mechanism of a detector is compromised
Note 1 to entry: For the purpose of this standard the terms “masked” and “masking” are considered interchangeable.
3.1.40
message
series of signals routed via interconnections which include identification, function data and the various means
for providing its own integrity, immunity and proper reception
3.1.41
metadata
additional data generated and transferred in conjunction with an event (e.g. location, direction of / size of
event of the event source). Purpose of the metadata is to provide information in order to evaluate the event
severity
Note 1 to entry This data could be part of the installation parametrizing.
3.1.42
normal condition
state of all or part of an EPSS where no fault, tamper or alarm conditions exist
3.1.43
notification
audible, visual or any other form of information requiring response following an event detected by the EPSS
(e.g. by warning device, by alarm transmission systems)
3.1.44
nuisance alarm
triggered alarm due to identified condition e.g. environmental condition
3.1.45
operator
authorised individual (a user) using an EPSS for its intended purpose
3.1.46
override
intervention, by a user, to permit setting when an EPSS is not in a normal condition
3.1.47
power supply
part of an alarm system which provides power for an EPSS or any part thereof
3.1.48
prime power source
power source used to support an EPSS under normal working conditions
3.1.49
promoting
increase of the protection level of all or part of an EPSS
Note 1 to entry promoting may be achieved by changing the status from unset to set.
3.1.50
protection level
level of significance which the user puts on detection events depending on the risk, threat, modus operandi,
site characteristics, which can vary over time and from zone to zone
Note 1 to entry: It is a parameter stored in the system expressing the level of tolerance based on a user evaluation and is
used to weight the event based factors to determine the alarm level.
3.1.51
restore
procedure of cancelling an alarm, tamper, fault or other condition and returning an EPSS to a previous
condition
3.1.52
self protection
methods or means used to protect an EPSS or part thereof against deliberate interference
3.1.53
set
status of an EPSS or part thereof in which an intruder alarm condition can be notified
3.1.54
severity
level of importance of a detection event (e.g. due to the position and characteristic)
Note 1 to entry: Severity is typically higher if the event is closer to the protected object. The output of detector could
indicate the severity of the event by providing additional information.
3.1.55
signal
variable parameters by which information is conveyed
3.1.56
site specific data (advanced)
data which is changed when the medium term situation needs an update of the EPSS (e.g. adding a new
detector or a new detection point)
3.1.57
site specific data (simple)
data which may be changed at access level 2B or 3 during the regular operation of the EPSS (e.g. adjusting
zone configuration (parameter), change protection level table, change alarm level mapping, changing areas
of an EPSS, change layer to zone mapping (e.g. because of changing usages))
3.1.58
supervised premises
part of an area in which an intrusion or attempted intrusion may be detected by an EPSS
3.1.59
supervised premises transceiver
alarm transmission equipment at the supervised premises, including the interface to the EPSS
3.1.60
tamper
deliberate interference with an EPSS or part thereof
3.1.61
tamper condition
condition of an EPSS in which tampering has been detected
3.1.62
tamper detection
detection of deliberate interference with an EPSS or part thereof
3.1.63
tamper signal or message
information generated by a tamper detector
3.1.64
unset
status of an EPSS or part thereof in which an intruder alarm condition cannot be notified
3.1.65
unwanted alarm
either nuisance or false alarm
3.1.66
user
person authorised to operate an EPSS
3.1.67
warning device
device that gives an audible or visual alarm in response to a notification
Note 1 to entry: A warning device may also provide alert indications providing such indications are easily
distinguishable from those related to the notification of an alarm condition.
3.1.68
zone
detection point or aggregation of detection points which can be set or unset (see 5.4)
3.2 Abbreviations
For the purposes of this document, the following abbreviations are used:
ACE ancillary control equipment
ACS access control system
ARC alarm receiving centre
ATP alarm transmission path
ATS alarm transmission system
DRDC detection of reduction of detection capability
EPSS external and perimeter security system
MARC Monitoring and alarm receiving centre
I&HAS Intrusion and hold-up alarm system
RVRC Remote video response centre
PC Performance Category
PS power supply
SPT Supervised premises transceiver
VSS Video Surveillance System
WD warning device
4 System Structure
4.1 General
The EPSS may be formed from one physical unit or its functionality may be provided by a combination of
multiple devices.
An EPSS may be operated in conjunction with other electronic security and alarm systems such as I&HAS,
VSS and ACS. Further interfaces to other security systems are permitted providing these do not interfere
with the mandatory requirements of this technical specification.
Figure 1 shows a typical system architecture of an EPSS and associated systems.

Figure 1 — Typical infrastructure of an EPSS
NOTE For Figure 1, the terms controller, power supply and detector are defined (see 3.1). The abbreviations are
explained in 3.2.
4.2 EPSS central functions
NOTE The mandatory functions required by this technical specification related to the receiving of signals and
messages from the user, the detectors and other connected systems (e.g. I&HAS, VSS, ACS) and processing them on
the basis of the system state and the configuration in the data storage are considered as the EPSS central functions.
The EPSS central functions may be provided by a single device or divided amongst multiple components.
The EPSS central functions may be provided within a component that provides other (non-central)
functionality, e.g. detectors.
The EPSS central functions shall generate signals and data for the provision of notification and indications,
other controlled devices (e.g. lighting) and actuators and, as appropriate, outputs to other systems.
4.3 Transceiver
EPSS may inform an Alarm Receiving Centre (ARC, MARC, RVRC) and/or other persons that alarm, fault or
tamper conditions are present. In the case of communication to an ARC the functionality for communicating
information from the EPSS shall be provided by a Supervised Premises Transceiver (SPT) that forms part of
an Alarm Transmission System (ATS). Communication to other persons, not via an ARC, may use other
forms of transceiver. See Clause 8.
NOTE Requirements for ATS are given in the EN 50136 series of standards.
4.4 User interface
4.4.1 User input
The EPSS shall have means for a user to control the system (e.g. change configuration, change of protection
level) by using e.g. keyboard, keypad. See 12.1
4.4.2 Indication
The EPSS shall provide indications to the user/operator of the EPSS of system information. Indications shall
be provided by indicators. Indicators for test, fault diagnosis, or configuration purposes may be located on
individual components of the EPSS. See 8.4 and 11.3
Indicators may be simple signal indicators (on/off light/sound), simple text-based visualization (such as
keypads), advanced operating software applications running on standard IT equipment or other suitable
visual or audible devices.
4.4.3 Warning Device
EPSS may provide notification to people on site by means of visual (e.g. flashing lights) or audible (e.g.
sirens) devices.
NOTE Such devices provide general information of an alarm condition and this information is not restricted to
certain users.
4.5 Power Supply
An EPSS shall incorporate one or more power supplies which may provide power from external sources (e.g.
mains power), local sources (e.g. generators), finite sources (e.g. battery) or renewable sources (e.g. solar
power). An EPSS may use multiple types of power supplies. See Clause 10.
4.6 Interconnections
Interconnections may be provided using any suitable technology provided the requirements of Clause 7 are
met.
NOTE  Interconnections are means of transferring information between EPSS components. This does not refer to
the system used to transfer information to the ARC (i.e. an ATS).
5 General Requirements, Classifications and Grading
5.1 General
EPSS shall include, as appropriate to the configuration of the EPSS, the functions specified in this Technical
Specification for the detection, processing of information, notification of alarms and the means to operate an
EPSS.
Other functions associated with EPSS not specified in this Technical Specification may be provided. Such
functions shall not affect the requirements of any mandatory or optional functions.
EPSS are exposed to conditions that inevitably cause nuisance alarms. Nuisance alarms are caused when
detectors are unable to distinguish between conditions that represent a genuine intrusion and other
conditions. In some cases it is possible to adjust detectors to reduce their likelihood to recognize nuisance
conditions as genuine alarms but this is associated with an increased probability that genuine intruders will
not be detected. To allow for the inevitability of nuisance alarms the design of EPSS may include assignment
of Protection Levels.
EPSS components shall be classified according to their environmental capability and graded according to
their performance.
EPSS components shall be compatible within an EPSS and selected according to the system grade,
performance category and appropriate environmental classification.
Components of other applications may be combined or integrated with an EPSS, providing the performance
of the EPSS is not adversely influenced. prEN 50398-1:2016 provides requirements for integration of alarm
systems with other systems and should be considered.
5.2 Grading
5.2.1 General
The EPSS is specified by two different categories: EPSS self protection and EPSS performance categories.
NOTE Advice about selection of the self-protection grade and performance category may be found in further
standards (e.g. Application Guidelines).
A higher grade of self-protection should be chosen when the EPSS (or part thereof) is considered to be at
greater risk of an intruder defeating the detection especially if this will be done in advance of the attack.
Higher classifications of performance category are intended for systems that are more sophisticated or
require greater flexibility of operation. For example a remote, non-staffed, water utility site may require a high
self-protection grade but low performance classification
5.2.2 EPSS self protection
The purpose of the grading is to provide adequate protection against attacks on the EPSS and its
components according to the assessed risk.
NOTE Requirements can be found in 6.3.
Each area of an EPSS shall be given a self protection grading which will determine the protection of the
components and the interconnections. This shall be one of four grades with 1 being the lowest and 4 the
highest.
All requirements for self protection shall comply with the grade chosen in each area.
Depending on the installation the self protection of components can vary due to the accessibility of the
component (see 6.1 and 6.2)
Components shared by more than one area shall have a grade equal to that of the highest area grade (e.g.
SPT, WD, PS).
5.2.3 EPSS performance categories
The purpose of the categorization is to allow for determination of the suitability of EPSS components and
systems according to installation of different sizes, required functional abilities and complexities.
Each area of an EPSS shall be given a performance category which will determine the detection and
processing ability of the components and the system. This shall be one of four categories with ‘A’ being the
lowest and ‘D’ the highest.
NOTE Requirements can be found in 11.2.4.
All performance requirements shall comply with the category chosen in each area.
Components shared by more than one area shall have a category equal or better to that of the highest area
category (e.g. SPT, WD, PS).
5.3 Environmental classification
5.3.1 General
Components shall be suitable for use in one of the following environmental classes. Environmental test
requirements for EPSS components are given in the individual component standards. EN 50130-5 describes
environmental test methods that may be applied to EPSS components.
NOTE 1 Classes I, II, III and IV are progressively more severe and therefore Class IV components may, for example,
be used in Class III EPSS.
EPSS components shall operate correctly when exposed to environmental influences specified in 5.3.2,
5.3.3, 5.3.4 and 5.3.5. For each class, typical information is given below.
NOTE 2 Annex A includes special national conditions for specified countries.
NOTE 3 The environmental conditions described in 5.3 are those in which an EPSS is expected to perform correctly,
they are not necessarily the conditions to be used during the testing of EPSS components.
NOTE 4 Some types of EPSS components may need to operate under specific conditions that are not included within
these environmental classes and for which extra testing may be required to confirm the components suitability. Examples
of such equipment include detectors using buried cable technology. Component standards in the EN 50661 series will
include such extra requirements when necessary.
5.3.2 Environmental Class I – Indoor
Environmental influences normally experienced indoors when the temperature is well maintained (e.g. in a
residential or commercial property).
NOTE Temperatures may be expected to vary between +5 °C and +40 °C with average relative humidity of
approximately 75 % non-condensing.
5.3.3 Environmental Class II – Indoor – General
Environmental influences normally experienced indoors when the temperature is not well maintained (e.g. in
corridors, halls or staircases and where condensation can occur on windows and in unheated storage areas
or warehouses where heating is intermittent).
NOTE Temperatures may be expected to vary between −10 °C and +40 °C with average relative humidity of
approximately 75 % non-condensing.
5.3.4 Environmental Class III – Outdoor – Sheltered or indoor extreme conditions
Environmental influences normally experienced out of doors when EPSS components are not fully exposed
to the weather or indoors where environmental conditions are extreme.
NOTE Temperatures may be expected to vary between −25 °C and +50 °C with average relative humidity of
approximately 75 % non-condensing. For 30 d per year relative humidity can be expected to vary between 85 % and
95 % non-condensing.
5.3.5 Environmental Class IV – Outdoor – General
Environmental influences normally experienced out of doors when EPSS components are fully exposed to
the weather.
NOTE Temperatures may be expected to vary between −25 °C and +60 °C with average relative humidity of
approximately 75 % non-condensing. For 30 d per year relative humidity can be expected to vary between 85 % and
95 % non-condensing.
5.4 Concepts (Area, Layer, Zone, Detector, Detector Point)
Each EPSS consists of at least one area, one layer and one zone and shall have at least one detection point.
For ease of system design and operation there may be a logical system structure using the geographical and
logical breakdown of the site with several “areas”, “zones” and “layers”. That may follow different approaches
where the relationship between layers and zones can be different as shown in Figure 2.
The examples are to demonstrate that there is no constraint between the relationship of zones and layers.
Detection points are shown as small points but in practice could fill the zone or layer. The purpose is to show
that detection points should not form part of more than one zone/layer.

Key
detection point
Figure 2 — Example of logical relationship between detection point, layers and zones
The top level of the structure of an EPSS with the largest number of detections points is the area; it can be
divided into different layers. A zone consists of at least one detection point and can belong to different layers.
Whereas each zone and each layer shall only belong to one area.
A detector may occupy several zones (e.g. a perimeter fence detector) or a zone may include more than one
detector. Each detection point may also be associated with a layer. The concept of the layer is that an
intruder progressing from the outside of a property towards the centre will pass through one or more layers.
Figure 3 shows an example of typical EPSS mapping.

Figure 3 — Example of EPSS mapping
5.5 Overview of Intrusion Detection, Tamper, Fault Types
5.5.1 General
EPSS shall include means for the detection of intruders, tampering and the recognition of faults necessary to
meet the requirements of this Technical Specification.
Other events may be detected providing this does not adversely influence the mandatory requirements for
the detection of intruders, tampering and the recognition of faults.
5.5.2 Detection
Detectors shall be suitable for the environment and application and may incorporate more than one
technology.
Detectors shall be designed and installed so as to maximize the detection of a penetration to the area to be
protected and minimize the risk of false alarms.
The detector shall send detection event signals or messages to the controller.
5.5.3 Tamper detection
Tamper detection shall be incorporated in EPSS components as required in 6.3 “self protection”.
Tamper signals and messages shall be generated and sent to the controller.
5.5.4 Recognition of faults
Dependent upon the PC of an EPSS means shall be provided to recognize the fault conditions specified in
6.5.
Where faults are detected by components fault signals and messages shall be generated and sent to the
controller.
5.5.5 Detection of reduction of detection capability
The EPSS shall have means to provide detection of reduction capability according to 6.4 and Table 8.
5.6 Documentation and Marking
5.6.1 EPSS documentation
Documentation relating to an EPSS shall be concise, complete and unambiguous. Information provided shall
be at least sufficient to install, put into operation, operate and maintain an EPSS.
Instructions relating to the operation of an EPSS shall be designed to minimize the possibility of incorrect
operation and be structured to reflect the access level of the user.
5.6.2 EPSS component documentation
Documentation relating to EPSS components (including non-exclusive IT-equipment and software) shall be
concise, complete and unambiguous. The documentation shall be sufficient to ensure the correct installation,
putting into operation and maintenance of EPSS components. Sufficient information shall be provided to
ensure the integration of each component with other EPSS components.
Component documentation shall include at least the following:
– name of manufacturer or supplier;
– description of equipment;
– standard to which component claims compliance;
– if certified, name or mark of the certification body;
– self protection grade and performance category
– environmental class.
5.6.3 Marking/Identification
All EPSS components designed to be a part of EPSS (therefore this excludes e.g. generic IT-equipment)
shall be marked with at least the following:
– name of manufacturer or supplier;
– manufacturer’s model number or identifier;
– date of manufacture or batch number or serial number;
– self protection grade and performance category;
– environmental class.
NOTE The marking can be inside the housing.
The marking shall be legible, durable and unambiguous. When space for marking of an EPSS component is
limited, codes may be used providing these are described in the associated component documentation.
When insufficient space is available for codes the component shall include means of identification which
allows cross reference to documentation providing the required information.
6 Component Requirements
6.1 Detection Performance
Detectors of an EPSS shall provide accurate detection with limited susceptibility to unwanted activations.
Specialist detectors are available to detect various events so careful thought needs to be given to provide the
most suitable detector for the EPSS design.
6.2 Protection by installation design
Depending on the design of installation the self protection grade of components may be reduced e.g.
installation in a control room, overlapping detection, inaccessibility. The means to provide the protection by
installation design will be described in TS 50661-7.
The documentation of the EPSS design shall show the method of protection.
6.3 Self Protection
Self protection consists of means to prevent and/or detect access to the internal elements of components
and means to prevent and/or detect diminishing of the detection and processing performance.
Housings shall be sufficiently robust to prevent undetected access to internal elements.
The self protection features are graded as in Table 1.
Table 1 — Basic self protection features
Self protection features Grade 1 Grade 2 Grade 3 Grade 4
c)
Detection of the reduction of detection Op Op Op M
a b
capability
Detection of substitution of co
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