Fire detection installations with addressed detector lines in potentially explosive atmospheres Technical Manual A6V10324618_i_en_-2020-04-28 Smart Infrastructure
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Table of contents A6V10324618_i_en_-- 1 About this document................................................................................. 5 1.1 Applicable documents .............................................................................. 8 1.2 Download center....................................................................................... 9 1.3 Technical terms, abbreviations, and symbols........................................... 10 1.4 History of changes.......................
| 72 5.5 Technical documentation for testing and maintenance work.................... 43 5.6 Qualifications of the testing personnel...................................................... 43 5.7 Tests prior to first commissioning ............................................................. 44 5.8 Recurring tests ......................................................................................... 45 5.9 Repair ..............................................................................
About this document 1 1 About this document Goal and purpose This document describes the ● Planning ● Mounting and installation ● Commissioning ● Maintenance and servicing of a fire detection installation FS20/FS720 with addressed detector lines in a potentially explosive atmosphere. In order to understand the information it contains, the reader must have a general awareness of the setup and function of the fire detection installation. The document also contains information on the operator's obligations.
1 About this document Target group Activity Qualification Installation personnel ● Assembles and installs the product components at the place of installation. Carries out a function check following installation. ● Has received specialist training in the area of building installation technology or electrical installations. Carries out all maintenance work. Checks that the products are in perfect working order. Searches for and corrects malfunctions.
About this document 1 Supplementary information and tips The 'i' symbol identifies supplementary information and tips for an easier way of working.
1 About this document Applicable documents 1.
About this document Download center Standards and directives Title IEC/EN 60079-14 Explosive atmospheres – Part 14: Electrical installations design, selection and erection IEC/EN 60079-17 Explosive atmospheres – Part 17: Electrical installations inspection and maintenance IEC/EN 60079-19 Explosive atmospheres – Part 19: Equipment repair, overhaul and reclamation IEC/EN 60079-25 Explosive atmospheres – Part 25: Intrinsically safe electrical systems EN 1127-1 Explosive atmospheres – Explosion prev
1 About this document Technical terms, abbreviations, and symbols 1.
About this document 1 History of changes 1.4 History of changes The reference document's version applies to all languages into which the reference document is translated. The first edition of a language version or a country variant may, for example, be version 'd' instead of 'a' if the reference document is already this version. The table below shows this document's revision history: Version Edition date Brief description i 2020-04-28 ● ● Chapter 4.
2 Safety Safety notes 2 Safety WARNING Contradictory safety instructions Risk of explosion caused by disregarding safety instructions ● Should safety instructions relating to explosion protection contradict other safety instructions, please observe the safety instructions relating to explosion protection. 2.1 Safety notes Comply with the following safety notes to protect life, limb, and property.
Safety Safety regulations for the method of operation 2 Depiction of risk of injury Notes on risk of injury is depicted as follows: WARNING Type and source of hazard Consequences in the event the hazard occurs ● Measures/prohibitions to prevent the hazard DEPICTION for possible damage to property Notes on possible damage to property is depicted as follows: NOTICE Type and source of hazard Consequences in the event the hazard occurs ● Measures/prohibitions to prevent the hazard 2.
2 Safety Safety regulations for the method of operation Mounting, installation, commissioning and maintenance ● ● ● ● If you require tools such as a ladder, these must be safe and must be intended for the work in hand. When starting the fire control panel ensure that unstable conditions cannot arise. Ensure that all points listed in the 'Testing the product operability' section below are observed.
Safety 2 Safety regulations for the method of operation Modules and spare parts ● ● ● ● Components and spare parts must comply with the technical specifications defined by Siemens. Only use products specified or recommended by Siemens. Only use fuses with the specified fuse characteristics. Wrong battery types and improper battery changing lead to a risk of explosion. Only use the same battery type or an equivalent battery type recommended by Siemens.
2 Safety Standards and directives complied with 2.3 Standards and directives complied with A list of the standards and directives complied with is available from your Siemens contact. 2.4 Release Notes Limitations to the configuration or use of devices in a fire detection installation with a particular firmware version are possible. WARNING Limited or non-existent fire detection Personal injury and damage to property in the event of a fire.
Principles Prerequisites for an explosion 3 3 Principles In many industries, the tasks of manufacturing, processing, transporting, and storing combustible materials cause gases, vapor, or mist to be created or emitted and then released into the surrounding environment. When these come into contact with oxygen in the air, the result may be a potentially explosive atmosphere that could lead to an explosion if it is ignited.
3 Principles Primary, secondary, and structural explosion protection 3.2 Primary, secondary, and structural explosion protection The principle of integrated explosion protection requires all the relevant explosion protection measures to be taken in a specific order. We draw a distinction between primary and secondary protective measures, as well as structural explosion protection.
Principles Physical parameters 3 3.3 Physical parameters 3.3.1 Flash point For flammable liquids, the flash point specifies the lowest temperature at which a vapor-air mixture that can be ignited by spark ignition forms above the liquid level. If the flash point of such a flammable liquid is significantly higher than the maximum temperatures that occur, no potentially explosive atmosphere can be created there.
3 Principles Physical parameters 3.3.3 Explosive mixture and explosion limits A potentially explosive atmosphere forms when one or more combustible substances are present within a particular concentration range. Lean mixture When the concentration of the combustible substance in the atmosphere is too low, the mixture is said to be lean. It is not possible for an explosion to happen if a mixture is too lean.
Principles 3 Sources of ignition 3.4 Sources of ignition Sources of ignition that could potentially occur in practice are: ● Mechanically generated sparks; e.g. as a result of using sparks generated from tools ● Hot surfaces ● Electrical sparks and arcs; e.g. as a result of – Short-circuit – Defects in the insulation on electrical lines – Electrostatic discharge on system parts – Lightning strike 3.
3 Principles Sources of ignition Main manufacturing room «A» Elevator Reactor room «B» Corridor Warehouse Reactor cylinder Control center Offices Staff rooms Figure 3: Example of zone classification: Pressure relief Zone 1 Zone 0 Zone 2 A qualified person must carry out zone classification. If a company does not have an expert who is able to assess the risk of explosion and specify the required protective measures, the services of an expert body should be enlisted to do this.
Principles 3 Ignition protection category 3.6 Ignition protection category Only explosion-protected equipment may be used in areas where a potentially explosive atmosphere could arise despite the use of measures to prevent such an occurrence. Electrical equipment intended for use in explosive gas atmospheres can be designed in various ignition protection categories in accordance with EN 60079.
3 Principles Ignition protection category Ignition protection category Labeling Ignition protection category "n_" n Schematic representation Norm This ignition EN 60079-15 protection category comprises several different ignition protection categories Application Programmable controllers 3.6.1 Ignition protection category 'Intrinsic safety' The peripheral devices for fire detection installations, referred to in the chapters that follow, fall into the ignition protection category 'Intrinsic safety'.
Principles Ignition protection category A6V10324618_i_en_-- 3 Intrinsically safe equipment Associated electrical equipment Example: Example: Example: Ex ib IIC T6 [Ex ib] IIC T6 Ex de [ib] IIC T6 All necessary specifications such as category, explosion group, and temperature class are available. Square brackets indicate that the associated electrical equipment contains an intrinsically safe electrical circuit that may be routed in zone 1, explosion groups IIA, IIB, and IIC.
3 Principles Classifying electrical equipment 3.7 Classifying electrical equipment Areas at risk of explosion are classified into zones, while electrical equipment is classified into device groups and device categories. On a certified device, information on the nameplate will tell you the zone in which the equipment may be used. 3.7.
Principles Classifying electrical equipment 3 3.7.3 Explosion groups and temperature classes For ignition protection categories 'd', 'i', 'nC', and 'nL', electrical equipment in group II is subdivided into groups IIA, IIB, and IIC in accordance with the applicable standards. The sub-division for pressure-resistant encapsulation is based on max. explosion-safe gaps (MESG).
3 Principles Labeling electrical equipment 3.
Use of fire detectors in areas at risk of explosion 4 Intrinsically safe installation in accordance with EN 60079-14 4 Use of fire detectors in areas at risk of explosion Fire detectors are mainly used in zone 1 and 2 areas at risk of explosion. Siemens' product range is designed for connection to intrinsically safe circuits, primarily category ia. This means that the devices can also be used in zone 0. 4.
4 Use of fire detectors in areas at risk of explosion Intrinsically safe installation in accordance with EN 60079-14 Grading the risk of explosion Equipment labeling needed Device group Device category Zone 0 II 1G Zone 1 II 1G or 2G Zone 2 II 1G or 2G or 3G You will find information on intrinsically safe installations using safety barrier SB3 in document 001204. See the chapter 'Applicable documents [➙ 8]'.
Use of fire detectors in areas at risk of explosion 4 Product range 4.2 Product range Below you will find a description of the approved periphery devices for fire detection installations FS20/FS720 in potentially explosive atmospheres.
4 Use of fire detectors in areas at risk of explosion Product range 4.2.2 Line adapter (Ex) FDCL221-Ex Device Approval number Ex labeling Category Detector line Ignition protection category C0 L0 [nF] [mH] U0 [V] I0 P0 [mA] [mW] -25 °C < T a < 60 °C FDCL221-Ex BVS 12 II (1) G [Ex ia Ga] IIC Line adapter (Ex) ATEX E 094 II (1) D [Ex ia Da] IIIC 82 2.
Use of fire detectors in areas at risk of explosion 4 Product range 4.2.4 Point detector OOH740-A9-Ex Device Approval number FDnet/C-NET MK Ex designation Category Ignition protection category -35 °C < T a < 70 °C OOH740-A9-Ex BVS 12 ATEX E 087 X 1 II 1 G Ex ia IIC T4 Ga Multi-sensor fire detector Ex-related connection data, intrinsically safe Line to external alarm indicator Ui 28 V Ii 100 mA Pi 700 mW Li Negligible Ci 0,2 nF U0 14.
4 Use of fire detectors in areas at risk of explosion Product range 4.2.6 Simple electrical equipment Equipment with simple and clear circuits (e.g. end-of-lines, LEDs, simple manual call points) is known as 'simple electrical equipment' or 'simple apparatus' in accordance with EN 60079-11, Section 5.7. Simple electrical equipment does not have its own sources of ignition and is, therefore, not subject to Directive 94/9/EC, Article 1, Section 3.
Use of fire detectors in areas at risk of explosion Specifications and restrictions relating to FDnet-Ex and C-NET-Ex 4 4.3 Specifications and restrictions relating to FDnet-Ex and C-NET-Ex When planning a fire detection installation in an area at risk of explosion, you must take into account not only the standards and directives that have already been referred to, but also the following system-specific points. Only stubs are possible in FDnet-Ex/C-NET-Ex. Loops are not permitted.
4 Use of fire detectors in areas at risk of explosion Specifications and restrictions relating to FDnet-Ex and C-NET-Ex Maximum number of line adapters (Ex) per line card and per loop ● ● ● ● A maximum of four loops are possible per line card. A maximum of four line adapters (Ex) FDCL221‑Ex may be used on each line card in order to avoid exceeding the permissible load capacity of the line card. A maximum of two line adapters (Ex) FDCL221-Ex may be used on each loop.
Duties of the operator 5 Relevant legal regulations 5 Duties of the operator To ensure safe operation of a fire detection installation in an area at risk of explosion, the operator must ensure that appropriate work equipment is available and that the personnel involved have the right skills and qualifications. These measures are required in order to maintain the safety level guaranteed by the manufacturer in the as-delivered state of the devices throughout their entire service life.
5 Duties of the operator Relevant legal regulations 5.1.2 Directive 2014/34/EU Directive 2014/34/EU replaces Directive 94/9/EC on April 20 2016. From April 20 2016, devices, components, and protective systems in potentially explosive areas may only be placed on the market in accordance with Directive 2014/34/EU. Certificates in accordance with Directive 2014/34/EU will not be issued until April 20 2016. Old certificates in accordance with Directive 94/9/EC will, however, continue to be valid. 5.1.
Duties of the operator 5 Technical regulations and standards 5.
5 Duties of the operator Preparatory measures 5.3 Preparatory measures The operator must carry out a risk assessment before installing equipment in an area at risk of explosion (in Germany, for example, this must be done in accordance with Section 3 of the Ordinance on Industrial Safety and Health). In this context, zone classification has to be carried out. The results of the risk assessment and zone classification procedures must be documented in the form of an explosion protection document.
Duties of the operator 5 Installation information 5.4 Installation information When mounting and installing equipment, it must be ensured that said equipment can be easily accessed for inspection and maintenance purposes. Electrical equipment must be safeguarded against external influences, which could have a negative impact on explosion protection. Possible influences are: ● Chemical actions, e.g., acid or alkali ● Thermal actions, e.g.
5 Duties of the operator Installation information Intrinsic safety 'i' ignition protection category Ensure that the intrinsically safe circuits are isolated from non-intrinsically safe circuits, as well as from other intrinsically safe circuits: 1. Always lay intrinsically safe circuits and non-intrinsically safe circuits so they are isolated from one another. Observe the minimum distances of the lines. 2. Identify intrinsically safe circuits consistently, e.g., by using light blue lines. 3.
Duties of the operator Technical documentation for testing and maintenance work 5 5.
5 Duties of the operator Tests prior to first commissioning 5.7 Tests prior to first commissioning Before commissioning is performed for the first time, the operator must observe the following points: ● Before commissioning is performed for the first time, make sure that work equipment whose safety is reliant on the installation conditions is tested after installation and before commissioning for the first time, as well as each time it is installed at a new site or location.
Duties of the operator Recurring tests 5 5.8 Recurring tests At regular intervals, an approved inspection body must perform recurring tests on systems that require monitoring and their system components. The tests aim to determine whether the system is operating correctly. It is the operator's responsibility to determine the test intervals for the entire system and the system components, on the basis of a safety evaluation.
5 Duties of the operator Repair 5.9 Repair If an item of equipment in a potentially explosive atmosphere has a defect which could endanger employees or third parties, it must not be operated any further. The operator has the following obligations regarding systems which require monitoring: ● The systems must be maintained in a proper condition. ● The systems must be monitored. Required troubleshooting or maintenance work must be carried out at once.
Duties of the operator 5 Special requirements for ignition protection category 'Intrinsic safety' 5.10 Special requirements for ignition protection category 'Intrinsic safety' The principle of 'intrinsic safety' is based on safely limiting electrical energy in a circuit to values that are below the minimum ignition energy of a potentially explosive atmosphere. This also involves limiting the heating in the circuit to a safe level.
5 Duties of the operator Special requirements for ignition protection category 'Intrinsic safety' WARNING Combining different ignition protection categories Risk of explosion ● Observe the applicable installer's regulations. ● Check whether the intended combination of ignition protection categories is permissible.
Duties of the operator 5 Maintenance 5.11 Maintenance As well as recurring tests, there are additional tasks that the operator has to carry out at regular intervals. These include, for example, cleaning work in the area at risk of explosion. There are also various testing measures, which are described in the next sections.
6 Mounting/Installation Preparatory measures 6 Mounting/Installation General planning specifications for fire detection installations also apply to areas at risk of explosion. Therefore, you must also observe the planning documentation for your fire detection installation. This document only deals with special considerations that apply when a fire detection installation is being installed in areas at risk of explosion.
Mounting/Installation Installation guidelines 6 6.2 Installation guidelines ● ● ● ● ● ● Cables may only be laid in rooms at risk of explosion if they are used in the systems located in these rooms. Recess-mounted cables which are fully laid in concrete may be guided through the Ex area. Only apparatus conforming to the specifications in chapter Product range [➙ 31] may be used downstream of the line adapter (Ex).
6 Mounting/Installation Installation materials for zones 0, 1, and 2 6.3 Installation materials for zones 0, 1, and 2 ● ● ● ● Only installation materials which correspond to the national directives may be used in rooms at risk of explosion. We recommend plastic pipes labeled as 'flame retardant' for installing fire detection installations. If metal pipes are laid, these should be connected to the equipotential bonding. Country-specific, standard cables and installation materials can usually be used.
Mounting/Installation Protective clearances for door and ventilation openings 6 6.4 Protective clearances for door and ventilation openings The national specifications determine the size of protective spacing for electrical apparatus at door and ventilation openings in rooms at risk of explosion.
6 Mounting/Installation Equipotential bonding 6.5 Equipotential bonding In areas at risk of explosion, systems and system parts made from metal must be connected to the equipotential bonding. Whether an appropriate equipotential bonding is present must be established before the start of installation. If there is no equipotential bonding, the project manager responsible must ask the site owner to rectify this deficiency. The equipotential bonding should be grounded following national guidelines.
Mounting/Installation Intrinsically safe circuits with line adapter (Ex) FDCL221-Ex 6 6.6 Intrinsically safe circuits with line adapter (Ex) FDCL221-Ex To prevent undesirable ground currents, the line adapter (Ex) FDCL221-Ex is implemented as a genuine transmitter that provides electrical isolation. ● As far as possible, line adapters (Ex) must be positioned directly in front of the room at risk of explosion.
6 Mounting/Installation Intrinsically safe circuits with line adapter (Ex) FDCL221-Ex Area not at risk Ex area Area not at risk FDCL221-Ex Ex >1m Area not at risk Figure 9: Example of a fire detection installation in an area at risk of explosion Ex Fire detector Alarm indicator Ex fire detector Line adapter (Ex) Wiring through non-Ex areas ● ● ● 56 | 72 Cable entries in Ex areas and through non-Ex areas must be gas-tight.
Mounting/Installation Intrinsically safe circuits with line adapter (Ex) FDCL221-Ex Ex area Area not at risk 6 Ex area FDCL221-Ex Ex Ex >1m >1m Area not at risk Figure 10: Wiring through non-Ex areas A6V10324618_i_en_-- 57 | 72
6 Mounting/Installation External alarm indicators FDAI92-Ex and FDAI93-Ex 6.7 External alarm indicators FDAI92-Ex and FDAI93Ex ● External alarm indicators are normally fitted outside the potentially explosive room without line adapters (Ex) directly on the wall to the potentially explosive room. An energy limitation device must be installed for larger distances between the alarm indicator and the potentially explosive room or if differing guidelines apply in that country.
Commissioning 7 7 Commissioning The devices are commissioned via the control panel. The exact procedure is described in the control panel documentation. Conduct a performance check once commissioning is complete. WARNING Using measuring and testing devices in potentially explosive areas Risk of explosion ● In potentially explosive areas, only use measuring and testing devices that are expressly approved for use in potentially explosive areas.
8 Maintenance/Servicing Responsibilities and choosing personnel 8 Maintenance/Servicing WARNING Using measuring and testing devices in potentially explosive areas Risk of explosion ● In potentially explosive areas, only use measuring and testing devices that are expressly approved for use in potentially explosive areas. WARNING Improper cleaning and maintenance of devices Risk of explosion ● Avoid electrostatic charging of devices during maintenance and cleaning work. ● Do not use any solvents! 8.
Annex A - Sample calculation Sample calculation 9 9 Annex A - Sample calculation WARNING Risk of explosion Incorrect evaluation or calculation of a simple intrinsically safe system ● The observations and calculations below may only be used if the system in question uses one current source alone. You will find more information about intrinsically safe systems in EN 60079-25. 9.
9 Annex A - Sample calculation Sample calculation Initial situation You are planning a 'Sinteso' fire detection installation in a potentially explosive atmosphere. The potentially explosive atmosphere has been classified as 'zone 1', category '2G'. Gasoline vapor may be produced in this atmosphere.
Annex A - Sample calculation 9 Sample calculation Equipment Value FDOOT241-A9-Ex FDM223-Ex C i [nF] 0,2 0,2 L i [mH] Negligible => 0 Negligible => 0 C 0 [nF] 38 38 L 0 [µH] 100 100 Cable used A two-wire, twisted cable should be used for the detector line in the potentially explosive atmosphere. The manufacturer specifies the following data for the cable: Cc 100 nF/km Lc 0.
9 Annex A - Sample calculation Sample calculation Annex A of EN 60079-25 provides assistance in considering the application case. Checking the conditions for the intrinsic safety of the detector line Condition (1): The output parameters of the line adapter (Ex) must be lower than the input parameters of the equipment.
Annex A - Sample calculation Sample calculation 9 The values stated above are guides only. The calculation must be performed with the actual values for the cables used. Alarm indicators The lines for the alarm indicators FDAI92-Ex, i.e., the cable sections 'e' and 'f', must be considered separately, since the alarm indicators are fed from the point detectors FDOOT241-A9-Ex and these are specified as separate sources.
10 Annex B - PTB numbers for older safety barriers 10 Annex B - PTB numbers for older safety barriers 66 | 72 Device name PTB number Safety barrier SB2 PTB 01 ATEX 2053 X Safety barrier SB3 PTB 01 ATEX 2088 X A6V10324618_i_en_--
Glossary Area at risk of explosion An area in which a potentially explosive gas atmosphere is present or could occur in quantities that would render special protective measures necessary for constructing, installing, and operating devices. See also EN 60079-10-1.
Maintenance Planned procedures that are carried out in order to keep the installed equipment in its intended condition. See also EN 60079-19. Maintenance and troubleshooting Combination of all activities carried out in order to bring an object into or restore it to a certain condition, where this condition conforms to the relevant specifications and ensures that the required functions can be performed. See also EN 60079-17.
Index Index A E Associated electrical equipment....................... 24 Earthing ............................................................ 29 Atmospheric conditions .................................... 59 Electrical equipment Classification into device groups ................. 26 C Labeling....................................................... 28 Classification of zones Energy limitation......................................... 51, 58 Zone 0 ...................................................
Index I S Ignition protection category .............................. 23 Safety level....................................................... 23 Scope Intrinsic safety ............................................. 42 Safety level.................................................. 23 Guidelines ................................................... 37 Ignition protection category 'Intrinsic safety'.... 24, Legal regulations ......................................... 37 47 Secondary explosion protection ..
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Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug +41 58 724 2424 www.siemens.com/buildingtechnologies A6V10324618_i_en_-- © Siemens Switzerland Ltd, 2011 Technical specifications and availability subject to change without notice.
