iTEL - Communication cables

This European Standard gives the environmental conditions and safety aspects of symmetrical, coaxial and optical cables used for the infrastructure of communication and control networks.

This part of IEC 61746 provides procedures for calibrating multimode optical time domain reflectometers (OTDR). It covers OTDR measurement errors and uncertainties. The test of the laser(s) source modal condition is included as an optional measurement. This standard does not cover correction of the OTDR response.

IEC 61300-3-29:2014 identifies two basic measurement methods for characterizing the spectral transfer functions of DWDM devices. The transfer functions are the functions of transmittance dependent of wavelengths. In this standard, optical attenuations are also used.  The transfer functions can be used to produce measurements of insertion loss (IL), polarization dependent loss (PDL), isolation, centre wavelength, bandwidth (BW) and other optical performances. This second edition cancels and replaces the first edition published in 2005. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:  - terms and definitions have been added and reconsidered in order to be harmonized with IEC 62074-1;  - characterizations of the device under test have been reviewed;  - details to be specified have been reconsidered. Keywords: spectral transfer functions of DWDM devices, measurements of insertion loss (IL), polarization dependent loss (PDL), isolation, centre wavelength, bandwidth (BW)

IEC 61300-2-42:2014 specifies a test to determine the influence of a side load applied to a cord assembled with a strain relief. The intention is to simulate a static load, due to a length of fibre cable, which would typically be experienced during service. Components should withstand side loads during optical transmission without degradation of the optical performance. Besides a boot, any feature that controls the bending radius of the fibre can be considered as strain relief. This third edition cancels and replaces the second edition published in 2005 and constitutes a technical revision. This edition includes the following significant technical change with respect to the previous edition: modification of the severity according to cable configurations. Keywords: side load, static load, optical performance, strain relief

IEC 61753-057-2:2012(E) contains the minimum initial test and measurement requirements and severities which a fibre optical fuse satisfies in order to be categorised as meeting the requirements of single mode fibre plug-receptacle style optical fuse used in controlled environments. Optical performance specified in this document relate to plug-receptacle style configuration fuses only.  Keywords: initial test and measurement requirements, single mode fibre plug-receptacle style optical fuse

This Technical Report describes the procedure to repair damaged CATV cables.
The following coaxial cables are considered in this guide:
–   Coaxial cables with semi air spaced dielectric
Outer conductor: copper band, longitudinal welded
–   Coaxial cables foamed polyethylene or solid polyethylene dielectric
Outer conductor: copper band, longitudinal welded
–   Coaxial cables foamed polyethylene or solid polyethylene dielectric
Outer conductor: Overlapped foil of copper or aluminium with braid
–   Coaxial cables foamed polyethylene or solid polyethylene dielectric
Outer conductor: Overlapped foil of copper or aluminium without braid
–   Coaxial cables foamed polyethylene dielectric
Outer conductor: Corrugated copper
This guide is a helpful tool for providers and installers to find out the extend and the effects of damaged cables and to achieve and to evaluate appropriate repair operation.
For not buried cables, e.g. indoor cables, the application of this guide is analogous.
NOTE The kind respectively the material of the cable sheath makes the coaxial cable an "underground" cable. In the underground area the cable jacket determines the long term behaviour of the cable significantly. For this purpose, only plastics with a high long-term stability are used, usually polyethylene (PE). This material provides protection against ingress of water or water-diffusion with good mechanical properties.

IEC 61300-2-19:2012 details a procedure for determining the suitability of a fibre optic device to withstand the environmental condition of high humidity and high temperature which may occur in actual use, storage and/or transport. The test is primarily intended to permit the observation of effects of high humidity at constant temperature over a given period. This third edition cancels and replaces the second edition published in 2005. It constitutes a technical revision. The changes with respect to the previous edition are to reconsider the severities and details to be specified. Keywords: high humidity and temperature, environmental condition

IEC 61753-056-2:2012(E) contains the minimum initial test and measurement requirements and severities which a fibre optical fuse satisfies in order for it to be categorised as meeting the requirements of single mode fibre pigtailed style optical fuse used in controlled environments. Optical performance specified in this document relates to in-line type configurations fuses only. Keywords: initial test and measurement requirements, single mode fibre pigtailed style optical fuse

IEC 61753-143-2:2012 contains the minimum test and measurement requirements and severity levels that a passive chromatic dispersion compensator (PCDC) using virtually imaged phased array (VIPA) must satisfy in order to be categorized as meeting the IEC standard, category C-controlled environments.  Keywords: passive chromatic dispersion compensator (PCDC), using virtually imaged phased array (VIPA), category C

EN 50288-11-1 is a sectional specification for un-screened cables, characterised from 1 MHz up to 500 MHz, to be used in horizontal and building backbone wiring for Information Technology generic-cabling systems.
This sectional specification contains the electrical, mechanical, transmission and environmental performance characteristics and requirements of the cables when tested in accordance with the referenced test methods.
This sectional specification is to be read in conjunction with EN 50288-1, which contains the essential provisions for its application.
The cables covered in this sectional specification are intended to operate with voltages and currents normally encountered in communications systems. These cables are not intended to be used in conjunction with low impedance sources, for example the electrical power supplies of public utility mains.

EN 50288-9-1 is a sectional specification for screened cables, characterised  from 1 MHz  up to 1 000 MHz, to be used in horizontal and building backbone wiring for Information technology generic-cabling systems.
This sectional specification contains the electrical, mechanical, transmission and environmental performance characteristics and requirements of the cables when tested in accordance with the referenced test methods.
This sectional specification should be read in conjunction with EN 50288-1 which contains the essential provisions for its application.
The cables covered in this sectional specification are intended to operate with voltages and currents normally encountered in communication systems. These cables are not intended to be used in conjunction with low impedance sources, for example, the electric power supplies of public utility mains.

EN 50288-10-1 is a sectional specification for screened cables, characterised from 1 MHz up to 500 MHz, to be used in horizontal and building backbone wiring for Information Technology generic-cabling systems.
This sectional specification contains the electrical, mechanical, transmission and environmental performance characteristics and requirements of the cables when tested in accordance with the referenced test methods.
This sectional specification is to be read in conjunction with EN 50288-1 which contains the essential provisions for its application.
The cables covered in this sectional specification are intended to operate with voltages and currents normally encountered in communications systems. These cables are not intended to be used in conjunction with low impedance sources, for example the electrical power supplies of public utility mains.

IEC 61280-2-2:2012(E) describes a test procedure to verify compliance with a predetermined waveform mask and to measure the eye pattern and waveform parameters such as rise time, fall time, modulation amplitude and extinction ratio. This fourth edition cancels and replaces the third edition published in 2008 and constitutes a technical revision .This edition includes the following significant technical changes with respect to the previous edition: additional definitions; clarification of test procedures. Keywords: optical eye pattern, waveform, modulation amplitude, extinction ratio

This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements that an SC-RJ connector set with one side protected by an industrial housing with the fibres terminated with cylindrical zirconia PC ferrules, an adaptor fitted with resilient alignment sleeves and
patchcord shall meet in order for it to be categorised as an EN standard product. The product is rated IP67. Since different variants are permitted, product marking details are given in 3.6.

Part 2-2 of this European Standard specifies requirements, limiting dimensions and operating forces for hand crimping tools with removable and interchangeable dies, sizes A to G, Q to T, V and W, for the termination of cables to radio frequency connectors. For tool style references see 5.1 and table 1

IEC 61754-26:2012 defines the standard interface dimensions for the type SF optical board connector that uses a normal glass fibre and the physical contact technique to connect flexible optical boards and ribbon fibres. Keywords: interface dimensions for type SF optical board connector

IEC 61300-2-33:2012(E) is a part of a series that evaluates the assembly and reassembly of a fibre optic mechanical splice, a fibre management system or a closure for a specified number of times. This third edition cancels and replaces the second edition published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: the inclusion of fibre management system and ancillary passive and active components as well as cable management system for the incoming and outgoing optical cables. Keywords: fibre optic mechanical splice, fibre management system or a closure

IEC 62037-4:2012(E) is part of the IEC 62037 series, and defines test fixtures and procedures recommended for measuring levels of passive intermodulation generated by coaxial cables. Two dynamic test methods and a static test method are defined.

IEC 61754-20-100:2012(E) covers connectors with protective housings. The housing is defined as variant 4 in IEC 61076-3-106:2006. These connectors use a push-pull coupling mechanism. To connect the fibres inside the housing the LC interface is used as described in IEC 61754-20:2002. The fully assembled variants (connectors) described in this document incorporate fixed and free connectors.

IEC 61754-20:2012(E) defines the standard interface dimensions for the type LC family of connectors. The changes with respect to the previous edition are to reconsider the whole document and to add Interface IEC 61754-20-9 to IEC 61754-20-16 for a plastic optical fibre (POF). Keywords: LC connectors

IEC 61754-28:2012 defines the standard interface dimensions for the type LF3 family of connectors.

IEC 61300-3-38:2012 describes the measurement methods necessary to characterise the group delay properties of passive devices and dynamic modules. From these measurements further parameters like group delay ripple, linear phase deviation, chromatic dispersion, dispersion slope, and phase ripple can be derived. In addition, when these measurements are made with resolved polarization, the differential group delay can also be determined as an alternative to separate measurement with the dedicated methods of IEC 61300-3-32.

IEC 61754-29:2012 defines the standard interface dimensions for the type BLINK series of connectors.

IEC 62149-7:2012 covers the performance specification for 1 310-nm discrete vertical cavity surface emitting laser (VCSEL) devices of transverse single-mode and multimode types used for the fibre optic telecommunication and optical data transmission application in a form of the VCSEL chips mounted on a substrate with wire bonding to their chips' anode and cathode terminals without any fibre pigtails. The performance standard contains a definition of the product performance requirements together with a series of sets of tests and measurements with clearly defined conditions, severities, and pass/fail criteria. Keyword: vertical cavity surface emitting laser (VCSEL).

IEC 61753-087-6:2012(E) contains the minimum initial performance, test and measurement requirements and severities which a fibre optic pigtailed 1 310 nm upstream and 1 490 nm downstream wide wavelength division multiplexing (WWDM) passive optical network (PON) device must satisfy in order to be categorized as meeting the requirements of category O (uncontrolled environments), as defined in Annex A of IEC 61753-1.

IEC 61300-3-28:2012 describes methods to measure fast variation of attenuation due to mechanical stresses applied on optical fibres and passive optical components during their lifetime. This method is not designed to measure very fast transient losses (with duration less than 1 ms) that could affect the performance of transmission systems. It is optimised to detect transient losses caused by mechanical stresses due to the tests prescribed in the component performance standards, whose duration is generally longer than several tens of milliseconds. Changes from the previous edition of the document are to update the test method and to reconsider the requirements. Keywords: Transient loss

IEC 61300-3-39:2011 selects non-angled physical contact (PC) optical connector plugs for use as the reference plug in the return loss RL measurement and to define an acceptance return loss value RL_a for use in plug acceptance testing. This procedure is for use to guarantee a certain return loss value RL when two plugs have been successfully tested against the reference connector when randomly mated. This second edition of IEC 61300-3-39 cancels and replaces the first edition published in 1997 and constitutes a technical revision. Changes from the previous edition are structure of the standard, general description and the Annex.

This European Standard specifies the constructional details and performance requirements for cables for indoor Residential Cabling Systems characterized up to 100 MHz. Cables in this European Standard are based on the common design rules specified in EN 50290-2-1 and are specifically intended for supporting ICT and BCT applications (telephone, computer and TV services) as specified in EN 50173-4. The cables covered in this European Standard are intended to operate with voltages and currents normally encountered in communication systems. These cables are not intended to be used in conjunction with low impedance sources, for example, the electrical power supply of public utility mains. Cables covered in this European Standard may however be subjected to voltages of not more than 300 V a.c. or 450 V d.c and comply with the requirements of the Low Voltage Directive. The maximum current rating per conductor is 3 A/mm? unless otherwise specified in the relevant detail specification.

This European Standard specifies the constructional details and performance requirements for cables for installation in indoor residential cabling systems characterized up to 1 200 MHz. Cables in this European Standard are based on the common design rules specified in EN 50290-2-1 and are specifically intended for supporting ICT and BCT applications (telephone, computer and TV services) as specified in EN 50173-4. The cables covered in this European Standard are intended to operate with voltages and currents normally encountered in communication systems. These cables are not intended to be used in conjunction with low impedance sources, for example, the electrical power supply of public utility mains. Cables covered in this European Standard may however be subjected to voltages of not more than 300 V a.c or 450 V d.c and comply with the requirements of the Low Voltage Directive. The maximum current rating per conductor is 3 A/mm? unless otherwise specified in the relevant detail specification.

This European Standard specifies the constructional details and performances requirements for cables for indoor residential cabling systems characterized up to 100 MHz. Cables in this European Standard are based on the common design rules specified in EN 50290-2-1 and are specifically intended for supporting ICT and BCT applications (telephone, computer and TV services) as specified in EN 50173-4. The cables covered in this European Standard are intended to operate with voltages and currents normally encountered in communications systems. These cables are not intended to be used in conjunction with low impedance sources, for example, the electrical power supply of public utility mains. Cables covered in this European Standard may however be subjected to voltages of not more than 300 V a.c. or 450 V d.c. and comply with the requirements of the Low Voltage Directive. The maximum current rating per conductor is 3 A/mm? unless otherwise specified in the relevant detail specification.

IEC 61291-4:2011 applies to optical amplifier (OA) devices and sub-systems to be used in multichannel applications. For single channel applications, use IEC 61291-2. The object of this performance specification template is to provide a frame for the preparation of detail specifications on the performances of OA devices and sub-systems to be used in multichannel applications. This third edition cancels and replaces the second edition published in 2008 and constitutes a technical revision. The main significant changes are the transient parameter test methods, IEC 61290-4 series, have been added to Tables 1, 2, and 3.   This publication is to be read in conjunction with IEC 61291-1:2006.

1.1   Product definition
This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements which a terminated and assembled singlemode resilient alignment sleeve LF3 APC 8° simplex connector set (plug-adaptor-plug), adaptor and patchcord will meet in order for it to be categorised as an EN standard product.
Since different variants and grades of performance are permitted, product marking details are given in 3.5.
1.2   Intermateability
Although all products conforming to the requirements of this European Standard will intermate, the resulting level of random attenuation performance will only be ensured in accordance with Table 1. The intention is that this will be true irrespective of the manufacturing source(s) of the product.
When intermating plug variants having different attenuation grades, the resulting level of attenuation cannot be assured to be any better than the worst attenuation grade.
The intermating of a grade C plug with a grade B plug will result in an uncertain level of random attenuation performance.
1.3   Operating environment
The tests selected combined with the severities and durations are representative of a Category C environment as defined in EN 61753-1.
1.4   Reliability
Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this European Standard does not guarantee the reliability of the product. This should be predicted using a recognised reliability assessment programme.
1.5   Quality assurance
Compliance with this European Standard does not guarantee the manufacturing consistency of the product. This should be maintained using a recognised quality assurance programme.

1.1   Product definition This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements that an SC-RJ connector set with one side protected by an industrial housing with the fibres terminated with cylindrical zirconia PC ferrules, an adaptor fitted with resilient alignment sleeves and patchcord shall meet in order for it to be categorised as an EN standard product. The product is rated IP67. Since different variants are permitted, product marking details are given in 3.6. 1.2   Intermateability Products conforming to the requirements of this specification will intermate and give the specified level of random attenuation and random return loss performance, provided that the same fibre type is used. The intention is that this will be true irrespective of the manufacturing source(s) of the product. 1.3   Operating environment The tests selected combined with the severities and durations, specified as category I, are intended to reflect, although they do not necessarily satisfy all the requirements of the boundary conditions of M3I3C3E3. 1.4   Reliability Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this specification does not guarantee the reliability of the product. This should be predicted using a recognised reliability assessment programme. 1.5   Quality assurance Compliance with this specification does not guarantee the manufacturing consistency of the product. This should be maintained using a recognised quality assurance programme.

1.1   Product definition This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements that an ODVA connector terminated with cylindrical zirconia PC ferrules with one side protected by an industrial housing, an adaptor fitted with resilient alignment sleeve and patchcord shall meet in order for it to be categorised as an EN standard product. The product is rated IP67. Since different variants are permitted, product marking details are given in 3.6. 1.2   Intermateability Products conforming to the requirements of this specification will intermate and give the specified level of random attenuation and random return loss performance, provided that the same fibre type is used. The intention is that this will be true irrespective of the manufacturing source(s) of the product. 1.3   Operating environment The tests selected combined with the severities and durations, specified as Category I, are intended to reflect, although they do not necessarily satisfy all the requirements of the boundary conditions of M3I3C3E3. 1.4   Reliability Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this specification does not guarantee the reliability of the product. This should be predicted using a recognised reliability assessment programme. 1.5   Quality assurance Compliance with this specification does not guarantee the manufacturing consistency of the product. This should be maintained using a recognised quality assurance programme.

IEC 61290-4-2:2011 applies to optical amplifiers (OAs) and optically amplified elementary sub-systems. More specifically, it applies to OAs using active fibres (optical fibre amplifiers, OFAs) containing rare-earth dopants, such as erbium doped fibre amplifiers (EDFAs), presently commercially available, as indicated in IEC 61291-1. The object of this part of IEC 61290-4 is to establish uniform requirements for accurate and reliable measurements, by means of the broadband source method, of the transient response of OFAs to dynamic changes in their input power, as defined in IEC 61290-4-1:2011.   This publication is to be read in conjunction with IEC 61291-1:2006.

IEC 62496-2-1:2011 describes the various methods to measure the optical attenuation and isolation of optical circuit boards (OCBs).

Corrigendum issued January 2011 (on German version only)

IEC 61169-35:2011(E) provides information and rules for preparation of detail specification of 2,92 series RF coaxial connectors together with the pro-forma blank detail specification. It also prescribes mating face dimensions for high performance connectors - grade 1, dimensional detail of standard test connectors - Grade 0, gauging information and tests selected from IEC 61169-1 applicable to all detail specifications relating to 2,92 series RF coaxial connectors. It cancels and replaces IEC/PAS 61169-35, published in 2009, of which it constitutes a minor revision. The only change is that the PAS has been changed into and International Standard.

IEC 61300-3-46:2011 provides a standard for the measurement of guide pin bore diameters in thermoplastic and thermoset MT ferrules specified in IEC 61754-5.

IEC 61169-39:2009(E) is a sectional specification. It provides information and rules for the preparation of detail specifications for CQM series quick lock RF connectors together with the pro forma blank detail specification (DS). It also prescribes mating interface dimensions for general purpose connectors, dimensional details of standard test connectors grade 0, gauging information and tests selected from IEC 61169-1, applicable to all detail specifications relating to CQM series connectors.

1.1   Product definition This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements which a connector terminated with cylindrical zirconia PC ferrule and assembled singlemode resilient alignment sleeve LC-PC simplex connector set (plug / adaptor / plug) adaptor and patchcord must meet in order for it to be categorised as an EN standard product. Since different variants and grades of performance are permitted, product marking details are given in 3.6. 1.2   Intermateability Although all products conforming to the requirements of this standard will intermate, the resulting level of random attenuation performance will only be ensured in accordance with Table 1. The intention is that this will be true irrespective of the manufacturing source(s) of the product. When intermating plug variants having different attenuation grades the resulting level of attenuation cannot be assured to be any better than the worst attenuation grade. Therefore, the intermating of a Grade C plug with a Grade B plug will result in an uncertain level of random attenuation performance.

IEC 61169-40:2010 provides information and rules for preparation of detail specification of 2.4 series R.F connectors together with the pro-forma blank detail specification. It also prescribes mating face dimensions for high performance connectors grade 1, dimensional detail of standard test connectors grade 0, gauging information and tests selected from IEC 61169-1 applicable to all detail specifications relating to 2.4 series RF connectors. This first edition cancels and replaces IEC/PAS 61169-40, published in 2008, of which it constitutes a minor revision. The changes with respect to the PAS are solely editorial.

IEC 61169-41:2011 provides information and rules for preparation of detail specification of CQA series quick lock R.F. coaxial connectors together with the pro-forma blank detail specification. It also prescribes mating face dimensions for general connectors - grade 2, dimensional detail of standard test connectors - grade 0, gauging information and tests selected from IEC 61169-1 applicable to all detail specifications relating to CQA series RF connectors. It indicates recommended performance characteristics to be considered when writing a detail specification and it covers test schedules and inspection requirements for assessment levels M and H. It cancels and replaces IEC/PAS 61169-41, published in 2009, of which it constitutes a minor revision. The only change is that the PAS has been changed into and International Standard. The French version of this standard has not been voted upon.

IEC 61300-3-22:2010 describes the procedure to measure the spring-loaded force applied to a ferrule when the plugs mate with each other during normal service. This measurement procedure is applicable to a connector plug which has a spring-loaded ferrule. Changes from the previous edition include reconsideration of the procedure and the details to be specified.

1.1   Product definition
This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements which a connector terminated with cylindrical zirconia 8° angled PC ferrule and assembled singlemode resilient alignment sleeve SC-APC simplex connector set (plug/adaptor/plug), adaptor and patchcord must meet in order for it to be categorised as an EN standard product.
Since different variants and grades of performance are permitted, product marking details are given in 3.6.
1.2   Intermateability
Although all products conforming to the requirements of this standard will intermate, the resulting level of random attenuation performance will only be ensured in accordance with Table 1. The intention is that this will be true irrespective of the manufacturing source(s) of the product.
When intermating plug variants having different attenuation grades, the resulting level of attenuation cannot be assured to be any better than the worst attenuation grade.
The intermating of a grade C plug with a grade B plug will result in an uncertain level of random attenuation performance.
1.3   Operating environment
The tests selected combined with the severities and durations are representative of a category U environment described in EN 61753 1.
1.4   Reliability
Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this standard does not guarantee the reliability of the product. This should be predicted using a recognised reliability assessment programme.
1.5   Quality assurance
Compliance with this standard does not guarantee the manufacturing consistency of the product. This should be maintained using a recognised quality assurance programme.

1.1   Product definition
This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements which a connector terminated with cylindrical zirconia PC ferrule and assembled singlemode resilient alignment sleeve SC-PC simplex connector set (plug/adaptor/plug), adaptor and patchcord must meet in order for it to be categorised as an EN standard product.
Since different variants and grades of performance are permitted, product marking details are given in 3.6.
1.2   Intermateability
Although all products conforming to the requirements of this European Standard will intermate, the resulting level of random attenuation performance will only be ensured in accordance with Table 1. The intention is that this will be true irrespective of the manufacturing source(s) of the product.
When intermating plug variants having different attenuation grades, the resulting level of attenuation cannot be assured to be any better than the worst attenuation grade.
The intermating of a Grade C plug with a Grade B plug will result in an uncertain level of random attenuation performance.
A simplex plug can be connected in a duplex adaptor without degrading its level of performance.
1.3   Operating environment
The tests selected combined with the severities and durations are representative of a category U environment described in EN 61753 1.
1.4   Reliability
Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this specification does not guarantee the reliability of the product. This should be predicted using a recognised reliability assessment programme.
1.5   Quality assurance
Compliance with this specification does not guarantee the manufacturing consistency of the product. This should be maintained using a recognised quality assurance programme.

IEC 62496-3-1:2009(E) defines the performance of flexible optical circuit boards (FOCBs) using unconnectorized optical glass fibres for controlled environment. This standard clarifies the requirements for quality classification of the flexible OCBs incorporating optical glass fibres.

IEC 62496-4:2011 covers general information on the subject of Optical Circuit Board (OCB) interfaces. It includes normative references, definitions and rules for creating and interpreting the standard drawings.

IEC 61300-2-17:2010 details a procedure for determining the suitability of a fibre optic device to withstand environmental conditions of extended low temperature (cold), which may occur in use, storage and/or transport. This procedure does not assess the ability of a device to operate during temperature variations; in this case, IEC 61300-2-22 would be used. The main changes with respect to the previous edition are:  - Procedure and details to be specified were reconsidered;  - The deviation of the temperature in severity was changed ± 3 °C to ± 2 °C.