prEN 12101-9

Smoke and heat control systems - Part 9: Control panels

This part of EN 12101 specifies the product performance requirements, classifications and test methods for control panels designed for use in smoke and heat control systems in buildings.

Rauch- und Wärmefreihaltung - Teil 9: Steuerungstafeln

In diesem Teil der EN 12101 sind die Anforderungen an die Leistungsfähigkeit des Produktes,
Klassifizierungen und Prüfverfahren für Steuerungstafeln spezifiziert, die für den Einsatz in Rauch- und
Wärmeabzugssystemen in Gebäuden ausgelegt sind.

Systèmes pour le contrôle des fumées et de la chaleur - Partie 9: Dispositifs de commande

Sistemi za nadzor dima in toplote – 9. del: Nadzorne plošče

General Information

• Status: Not Published
• Technical Committee: CEN/TC 191 - Fixed firefighting systems
• Drafting Committee: CEN/TC 191/SC 1/WG 7 - Power supplies
• Current Stage: 4598 - Decision to abandon - Finalization for Vote
• Start Date: 24-Jul-2008
• Completion Date: 24-Jul-2008
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/109 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on fire alarm/detection, fixed firefighting, fire and smoke control and explosion suppression products
• Ref Project: OSIST prEN 12101-9:2005 - Smoke and heat control systems - Part 9: Control panels

Standards Content (Sample)

SLOVENSKI OSIST prEN 12101-9:2005

PREDSTANDARD
februar 2005
Sistemi za nadzor dima in toplote – 9. del: Nadzorne plošče
Smoke and heat control systems - Part 9: Control panels
ICS 13.220.20 Referenčna številka
OSIST prEN 12101-9:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD
DRAFT
prEN 12101-9
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2004
ICS
English version
Smoke and heat control systems - Part 9: Control panels
Systèmes pour le contrôle des fumées et de la chaleur - Rauch- und Wärmefreihaltung - Teil 9: Steuerungstafeln
Partie 9
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 191.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12101-9:2004: E
worldwide for CEN national Members.

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prEN 12101-9:2004 (E)
Contents Page
Foreword. 3
1 Scope. 7
2 Normative references . 7
3 Definitions and abbreviations. 7
4 General requirements. 10
5 Electrical systems. 16
6 Pneumatic systems. 30
7 Mechanical control panels (m.c.p) . 39
8 Design requirements . 40
9 Additional design requirements for software controlled control panels . 43
10 Marking . 46
11 General test requirements. 46
12 Tests. 49
13 Evaluation of conformity. 62
Annex A (informative) Explanation of access levels. 68
Annex B (informative). 70
Annex C (informative) Limitations of the effect of faults (see also 5.1.5) . 71
Annex ZA (normative) Clauses of this European Standard addressing essential
requirements or other provisions of EU-Directive . 72

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prEN 12101-9:2004 (E)
Foreword
This document (prEN 12101-9:2004) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a mandate given to CEN by the European Commission and
the European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
This European Standard is one of ten parts of the European standard EN 12101 covering smoke and
heat control systems.
This European Standard has the general title Smoke and heat control systems and consists of the
following ten parts:
Part 1, Specification for smoke barriers — Requirements and test methods
Part 2, Specification for natural smoke and heat exhaust ventilators
Part 3, Specification for powered smoke and heat exhaust ventilators
Part 4, Natural smoke and heat exhaust ventilation systems — Installation and test methods
Part 5, Design and calculation for smoke and heat exhaust ventilation systems (published as
CR 12101-5)
Part 6, Design and calculation methods and installation procedure for pressure differential smoke
control systems
Part 7, Specifications for smoke ducts
Part 8, Specifications for smoke dampers
Part 9, Control panels
Part 10, Power supplies
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prEN 12101-9:2004 (E)
EN 12101 is included in a series of European Standards planned to cover also:
 Gas extinguishing systems (EN 12094 and EN ISO 14520)
 Sprinkler systems (EN 12259)
 Powder systems (EN 12416)
 Explosion protection systems (EN 26184)
 Foam systems (EN 13565)
 Hose systems (EN 671)
 Water spray systems
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prEN 12101-9:2004 (E)
Introduction
Smoke and heat exhaust ventilation systems create a smoke free layer above the floor by removing
smoke and thus improve the conditions for the safe escape and/or rescue of people and animals and
the protection of property and permit the fire to be fought while still in its early stages. They also
exhaust hot gases released by a fire in the developing stage.
The use of smoke and heat exhaust ventilation systems to create smoke free areas beneath a
buoyant smoke layer has become widespread. Their value in assisting in the evacuation of people
from construction works, reducing fire damage and financial loss by preventing smoke logging,
facilitating fire fighting, reducing roof temperatures and retarding the lateral spread of fire is firmly
established. For these benefits to be obtained it is essential that smoke and heat exhaust ventilators
operate fully and reliably whenever called upon to do so during their installed life. A heat and smoke
exhaust ventilation system is a scheme of safety equipment intended to perform a positive role in a
fire emergency.
Components for smoke and heat exhaust ventilation systems should be installed as part of a properly
designed system.
Smoke and heat exhaust ventilation systems help to
 keep the escape and access routes free from smoke;
 facilitate fire fighting operations by creating a smoke free layer;
 delay and/or prevent flashover and thus full development of the fire;
 protect equipment and furnishings;
 reduce thermal effects on structural components during a fire;
 reduce damage caused by thermal decomposition products and hot gases.
Depending on the design of the system, natural or powered smoke and heat ventilators can be used
in a smoke and heat control system.
Control panels are required to control all moving components in a SHEVS system, such as:
 Natural ventilators.
 Powered ventilators.
 Smoke barriers.
 Smoke dampers.
 Air inlets.
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prEN 12101-9:2004 (E)
SHEVS control panels may also provide control for day to day ventilation and signals to other fire
safety equipment under fire conditions.
SHEVS control panels may be for Extra Low Voltage or Low Voltage electrical systems or pneumatic
systems or any combination of these.
Power supply equipment for control panels are dealt with in EN 12101-10.
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prEN 12101-9:2004 (E)
1 Scope
This part of EN 12101 specifies the product performance requirements, classifications and test
methods for control panels designed for use in smoke and heat control systems in buildings.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN ISO 9001, Quality systems — Model for quality assurance in design/development, production,
installation and servicing (ISO 9001:1994)
EN ISO 9002, Quality systems — Model for quality assurance in production, installation and servicing
(ISO 9002: 1994)
EN ISO 9003, Quality systems — Model for quality assurance in final inspection and test
(ISO 9003: 1994)
EN 54
EN 54-5
EN 54-11
EN ISO 6988
EN 50130-4
EN 60068-1
EN 60068-2-1
EN 60068-2-6
EN 60068-2-52
EN 60068-2-56
EN 60068-2-75
EN 60529
ISO 3098-1
3 Definitions and abbreviations
3.1 Definitions
3.1.1
access level
one of several states of a c.p. in which selected
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prEN 12101-9:2004 (E)
 controls can be operated;
 manual operations can be carried out;
 indications are visible, and/or;
 information can be obtained.
NOTE Further information on access levels is given in annex A.
3.1.2
addressable point
a point which can be individually identified at the c.p
3.1.3
basic control panel
single operation initiating device for a SHEVS component e.g. fireman’s switch, manual call point or
single use gas bottle assembly
3.1.4
fire condition
when a fire signal has been received and processed by the c.p., b.c.p. or m.c.p. fire operational
position
3.1.5
fire operational position
configuration of a SHEVS component specified by its designer to be achieved and sustained while the
system is venting smoke and heat
3.1.6
frangible element
a component which is glass or has the appearance of glass and which after receiving a blow or
pressure as instructed, is physically broken or is visibly displaced by change of position and remains
in that condition until replaced or reset
3.1.7
mechanical control panel
operation initiation device for a SHEVS component where the initiation is provided by release of
tension in a mechanical linkage (usually a cable) between the panel and the component
3.1.8
powered smoke and heat exhaust ventilator
hot gas fan that is suitable for handling hot gases for a limited period only
3.1.9
response time
period between the signal to operate being received by the control panel and the achievement of the
fire condition
3.1.10
site specific data
information that the main program uses and that is specific to the installation. This may include
information such as allocation of devices to specific zones, time settings and sensitivity levels
3.1.11
smoke and heat control system
arrangement of components installed in a construction work to limit the effects of smoke and heat
from a fire
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prEN 12101-9:2004 (E)
3.1.12
smoke and heat exhaust ventilator (SHEV)
device specially designed to move smoke and hot gases out of the construction work under conditions
of fire
3.1.13
smoke and heat exhaust ventilation system (SHEVS)
smoke and heat exhaust ventilation system consists of components jointly selected to exhaust smoke
and heat to establish a buoyant layer of warm gases above cooler, cleaner air
3.1.14
standby condition
the quiescent condition when the c.p., b.c.p. or m.c.p. is fully operational and waiting to receive a fire
signal
3.1.15
ventilator
device for enabling the movement of gases into or out of a construction work
3.2 Abbreviations
b.c.p. = basic control panel
c.p.   = control panel
m.c.p. = mechanical control panel
p.s.e. = power supply equipment
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prEN 12101-9:2004 (E)
4 General requirements
4.1 Overview

Electrical Pneumatic Mechanical
systems systems systems
Control Basic Control Control Basic Control Mechanical Control
panels panels panels panels
panels
General requirements General requirements General requirements General requirements General requirements
clause 5.1.1 clause 5.2.1 clause 6.1.1 clause 6.2.1 clause 7.1
Standby condition Standby condition Standby condition Standby condition Manual initiation
clause 5.1.3 clause 5.2.3 clause 6.1.3 clause 6.2.2 clause 7.2
Fire condition Fire condition Fire condition Fire condition Electric initiation
clause 5.1.4 clause 5.2.4 clause 6.1.4 clause 6.2.3 clause 7.3
Fault warning condition
Fault warning condition Pneumatic initiation
clause 5.1.5 clause 6.1.5 clause 7.4
Disabled condition Disabled condition
clause 5.1.6 clause 6.1.6
Test condition Test condition
clause 5.1.7 clause 6.1.7
General requirements
Tests
Environmental test








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prEN 12101-9:2004 (E)
4.2 General requirements
4.2.1 If an optional function with requirements is included in the c.p. or b.c.p., then all the
corresponding requirements shall be met.
4.2.2 If functions other than those specified in this European Standard are provided they shall not
jeopardise any requirements of this European Standard.
4.2.3 For the purposes of this European Standard, control panels shall be classified as
Class A Mechanical control panels
Class B Basic control panels and pneumatic only control panels
Class C control panels without detectors (See Figure 1)
Class D control panels with detectors (See Figure 2)
See annex B for a summary of the functions relevant to each class.

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prEN 12101-9:2004 (E)

INITIATING LINE TRANSMISSION MONITORED MONITORED
PATH COMMAND CONTROLLED
LINE LINE
EN 54-4
Control
p.s.e
Control
panel #1
SHEVS
panel #n
Manual Component
CIE
Command
EN 54-2
unit
SHEVS
Component
Indicating
Detector unit
Manual
p.s.e
call p.s.e
EN12101-10
point EN12101-10


Figure 1 — An example of a class C control panel





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prEN 12101-9:2004 (E)
12
33
4
P.S.E
5
EN 12101-10
28
67

key
1 = Buzzer lamp
2 = Potential free contact
3 = SHEV
4 = Wind / rain detector
5 = 230 V / 400 VAC Main power supply
6 = Smoke detector EN 54-7, Temperature detector EN 54-5
7 = Manual call point
8 = Vent button

Figure 2 — An example of a class D control panel
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prEN 12101-9:2004 (E)
4.2.4 For the purposes of this European Standard, control panels shall be classified as one of the
following:
Re A : as declared by the manufacturer (A>50) ,
Re 50
Re 1000
The designation A, 50, and 1000 will represent the number of operating cycles into the fire condition.
Where the control panel is also used for day to day ventilation an additional 10,000 cycles are
required.
4.2.5 Type and location of control panels
For the purposes of this European Standard the control panel shall comprise at least one enclosure.
Several enclosures (e.g. manual call points for different zones) may be connected to the primary
enclosure. See Figure 3.
a) electrical

4
1
2 3/5
4
1
4
2 3/5
4
1 2 4
2 3/5
2 3/5
4
4
2
4
1a
4
2
3/5
1b
4





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prEN 12101-9:2004 (E)


b) Pneumatic

4
1
2 3/5
4
1 2 5 4
2 3/5
2 5 4
4
25


NOTE pneumatic p.s.e. may be compressor set, air receiver or gas bottle as appropriate.

Key
1 main supply in 4. actuator, motor, solenoid, etc
5 basic control panel
2 power supply equipment
3. control panel

Figure 3 — Examples showing typical locations and interrelationships of c.p. with other
components of a smoke control system
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prEN 12101-9:2004 (E)
4.2.6 Controls may be provided for use in the standby position (e.g. to use ventilators for day to day
comfort ventilation). However, all such controls shall be overridden by activation of any fire initiation
device.
5 Electrical systems
5.1 Control panels
5.1.1 General requirements
5.1.1.1 If functions other than those specified in this European Standard are provided they shall not
jeopardise any requirements of this European Standard.
5.1.1.2 The c.p. shall be capable of being simultaneously in any combination of the following
functional conditions:
 fire condition;
 fault warning condition;
 disablement condition (if provided);
 test condition (if provided).
5.1.2 General requirements for indications
5.1.2.1 Display of functional conditions
5.1.2.1.1 The c.p. shall be capable of unambiguously indicating the following functional conditions,
as described in clauses 5.1.3 to 5.1.7:
 standby condition;
 fire condition;
 fault warning condition;
 disablement condition (if provided);
 test condition (if provided).
5.1.2.2 Incorrect position indication (Option with requirements)
The c.p. may provide separate indication of incorrect position of SHEVS components as well as fault
indication. Light emitting indication may be shared with fault indication or fire indication and with
incorrect device position indicated by flashing. Priority is for the fault indication if shared.
5.1.2.3 Display of indications
All compulsory indications shall be clearly identifiable, except where otherwise specified in this
European Standard. All compulsory indications of each SHEVS Zone shall be displayed together at
least once in either its respective SHEVS zone or in a single location.
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prEN 12101-9:2004 (E)
5.1.2.4 Indications on alphanumeric displays
Where an alphanumeric display is used to display indications relating to different functional conditions
these may be displayed at the same time. However for each functional condition there shall be only
one window, in which all of the fields relating to that functional condition are grouped.
5.1.2.5 Additional indications
Where indications are used in addition to compulsory indications these shall not result in contradiction
or confusion.
5.1.2.6 Indications by means of light emitting indicators
5.1.2.6.1 Compulsory indications from light emitting indicators shall be visible in an ambient light
intensity up to 500 lux, at any angle up to 22,5 degrees from a line through the indicator perpendicular
to its mounting surface.
 at 3 m distance for the general indications of functional condition;
 at 3 m distance for the indication of the supply of power;
 at 0.8 m distance for other indications.
5.1.2.6.2 If the same light emitting indicators are used for the indication of specific faults and
disablements, fault indications shall be flashing and disablement indications shall be steady.
5.1.2.7 Indications on alphanumeric displays (option with requirements)
5.1.2.7.1 If an alphanumeric display consists of elements or segments, the failure of one of these
shall not affect the interpretation of the compulsory information.
5.1.2.7.2 Alphanumeric displays used for compulsory indications shall have at least one clearly
distinguishable window, consisting of at least two clearly identifiable fields.
5.1.2.7.3 If not included in the displayed information, the purpose of each field shall be clearly
labelled.
5.1.2.7.4 A field shall be capable of containing either:
a) at least 16 characters where the display uses a cross-reference to other information to identify
the location, or;
b) at least 40 characters, where the display is intended to include the complete information on the
location.
5.1.2.7.5 Compulsory indications on an alphanumeric display shall be legible for at least one hour
following the display of a new indication of fire or fault, at 0.8 m distance, in ambient light intensities
from 5 lux to 500 lux, at any angle from the normal to the plane of the display up to
 22,5 degrees when viewed from each side;
 15 degrees when viewed from above and below.
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prEN 12101-9:2004 (E)
Following this, the indications shall be legible at 100 to 500 lux, at the above distance and angles. It
shall be possible to re-establish the legibility at 5 to 100 lux by means of a manual operation at access
level 1.
5.1.2.8 Audible indications (option with requirements)
5.1.2.8.1 Audible indicators shall be part of the c.p. The same device may be used for fire alarm
and fault warning indications.
NOTE The sound may be the same or different for each indication. If different then the fire alarm shall have
priority.
 The minimum sound level, measured under anechoic conditions at a distance of 1 m, with any
access door on the c.p. closed, shall be
 50 dB(A) for fault warning indications.
 60 dB(A) for alarm condition
5.1.2.9 Testing of indicators (option with requirements)
All compulsory visible and audible indicators shall be testable by a manual operation at access level 1
or 2.
5.1.3 Standby condition
5.1.3.1 Visual indication
5.1.3.1.1 A green visible indication shall be given by means of a separate light emitting indicator
while the c.p. is supplied with power or fully active unless loss of power results in the entire SHEVS
moving to its fire operational position. The meaning shall be clearly labelled on the c.p.
5.1.3.1.2 Any kind of information may be displayed in the standby position. However, no indications
shall be given which could be confused with indications used in the
 Fire condition
 Fault warning condition
 Disabled condition
 Test condition
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prEN 12101-9:2004 (E)
5.1.4 Fire condition
5.1.4.1 Reception and processing of fire signals (Inputs)
5.1.4.1.1 The c.p. shall be capable of receiving, processing and interpreting relevant initiating
signals. Any signal from one input shall not falsify the processing, storage, interpretation and/or
indication of signals from other inputs, e.g. fire alarm systems, smoke detectors, sprinkler flow
switches, manual operations, etc.
5.1.4.1.2 The response time of the c.p. shall not exceed 10 s.
5.1.4.1.3 All fire signals shall have priority over any other signal.
5.1.4.2 Control panel Outputs
5.1.4.2.1 The c.p. shall be capable of providing relevant initiation signals to SHEVS components
and any warning or information outputs specified.
5.1.4.2.2 Where power to SHEVS components is provided through the c.p., the c.p. shall be
capable of switching and maintaining the rated power output when required.
5.1.4.2.3 All fire outputs shall have priority over any other output.
5.1.4.3 Visual indication
Visual indication shall be red for
 the fire condition activation;
 the fire position of the SHEVS device(s) (if provided); This indication may flash to show a device
or devices not in the fire position.
NOTE Visual indication may be by a single red indicator for the entire system or separate red indicators for
separate zones or groups of equipment.
5.1.4.4 Audible indication (option with requirements)
The c.p. may have provision for the audible indication of the fire condition at the c.p. and/or a remote
location. In this case the following shall apply:
a) It shall be possible to silence the audible indication at access level 1 or 2;
b) The audible indication shall not be silenced automatically; The audible indication may be silenced
automatically if the c.p. is manually reset from the fire condition.
c) If the audible indication is used for more than one zone, following silencing it shall be possible to
automatically re-sound the audible indication by an actuation in another zone. Output to the fire
alarm condition (option with requirements)
At least one output which signals the fire condition shall be provided, complying with the requirements
of 5.1.4.5.
All compulsory outputs shall be fully functional with 10 s of the receipt of a fire alarm condition. or the
activation of any manual call point.
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prEN 12101-9:2004 (E)
5.1.4.5 Output to systems than other than SHEVS (option with requirements)
The c.p. may have provision for the transmission of fire condition signals to other systems. Failure of
these other systems shall not adversely affect the c.p. For example this can be achieved using a
potential free contact or opto-coupler.
5.1.4.6 Deadlock
It is possible that the connected SHEVS components may fail to operate at the first attempt, for
instance in the case of iced flaps. To overcome this the control panel shall operate the output to
actuators at least once every 120 seconds for a period of at least 30 minutes and to solenoids or a
electromagnets with a pulse of at least 2 seconds every 10 seconds for at least 2 minutes.
5.1.4.7 Reset from the fire condition
Following a reset operation, the indication of the correct functional conditions, corresponding to any
received signals, shall either remain, or be re-established within 20 s.
5.1.4.8 Co- incidence detection (Class C - option with requirements)
Following the receipt of a signal from a fire detector, and until one or more confirmatory signals are
received from the same or other points, the c.p. may have provision to inhibit either the indication of
the fire alarm condition, or the operation of one or more outputs.
In these cases at least the following shall apply:
a) it shall be possible to select the feature at access level 3 for individual zones;
b) the inhibition of one output signal shall not affect the other outputs.
5.1.4.9 Dependency on more than one alarm signal (option with requirements)
A c.p. may be capable of receiving more than one alarm signal and initiating a range of outputs
depending upon the signal or signals received.
In these cases at least the following shall apply:
a) the cause and effect conditions shall be clearly stated in the design documentation;
b) it shall only be possible to change the cause and effect conditions at access level 3 or 4;
c) once the correct output or outputs are determined any further alarm signals (other than from
manual fireman's override switches) shall not change the outputs.
5.1.5 Fault warning condition (See annex B)
5.1.5.1 Reception and processing of fault signals
5.1.5.1.1 The c.p. shall enter the fault warning condition when signals are received which, after any
necessary processing, are interpreted as a fault.
5.1.5.1.2 The c.p. shall be capable of simultaneously recognising all of the faults specified in
5.1.5.1.3 and 5.1.5.2, with the exception that the recognition of a fault in a given zone or function may
be prevented by one or more of the following:
a) the presence of fire alarm signals from the same zone;
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prEN 12101-9:2004 (E)
b) the disablement of the corresponding zone or function (if provided);
c) the testing of the corresponding zone or function(if provided);
d) fault warning routing equipment.
5.1.5.1.3 Any interruption, short circuit or breakdown between the control panel and any
component of the SHEVS or a signal from the p.s.e. shall be indicated within 100 seconds of the
occurrence unless the SHEVS goes automatically to its fire condition in case of that failure. The
following faults shall be indicated within 100 seconds.
Table 1 — Monitoring of cable faults
Line between Interruption Short circuit
c.p. <-> actuator / drive C C**
c.p. <-> automatic smoke detector C C*
c.p. <-> Call point C C*
c.p. <-> separate c.p. or b.c.p. C C
C C
c.p. <-> separate p.s.e
c.p.<-> SHEVS component position indicating contact C C
C = Compulsory
X = Not required
C* = Short circuit between wires for initiation the SHEVS only
C** = Where the ventilators are partially open for day to day ventilation monitoring is not
required until they are in their reset or fully open position.

Interruption: An interruption in accordance with this standard is the cutting through of wires required
for fire condition operation of the system and incorrect position indication (if used).
In the case of a single output from the c.p. to actuators, drives or motors using more than 2 term
...