31.160 - Electric filters
ICS 31.160 Details
Electric filters
Elektrische Filter
Filtres electriques
Električni filtri
General Information
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This part of IEC 60939 covers passive filters used to attenuate unwanted radio-frequency
signals (such as noise or interference) generated from electromagnetic sources.
Both single and multi-channel filters within one enclosure or which are built on a printed circuit
board forming a compact entity are included within the scope of this document.
Filters constructed of capacitive elements where the inductance is inherent in the construction
of the filter are within the scope of this document. Similarly, filters constructed of inductive
elements where the capacitance is inherent in the construction of the filter are also within the
scope of this document. It is up to the manufacturer to state whether a given component is to
be designed as a capacitor, an inductor or a filter. Filters can include also other components
such as resistors and/or varistors or similar components.
This document applies to passive filter units for electromagnetic interference suppression for
which safety tests are appropriate. This implies that filters specified according to this document
will either be connected to mains supplies, when compliance with the mandatory tests of
Table B.1 is necessary, or used in other circuit positions where the equipment specification
specifies that some or all of these safety tests are required.
This document applies to passive filter units, which will be connected to an AC mains or other
supply (DC or AC) with a nominal voltage not exceeding 1 000 V AC, with a nominal frequency
not exceeding 400 Hz, or 1 500 V DC.
NOTE For AC use, IEC 60384-14 applies to capacitors which will be connected to AC mains with a nominal
frequency not exceeding 100 Hz.
This document covers appliance filters (US) but does not cover facility filters, cord-connected
filters or direct plug-in filters. These other filters will be covered by another sectional
specification.
- Standard84 pagesEnglish languagesale 10% offe-Library read for1 day
- Amendment9 pagesEnglish languagesale 10% offe-Library read for1 day
IEC 60939-3:2024 is available as IEC 60939-3:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60939-3:2024 covers passive filters used to attenuate unwanted radio-frequency signals (such as noise or interference) generated from electromagnetic sources. Both single and multi-channel filters within one enclosure or which are built on a printed circuit board forming a compact entity are included within the scope of this document. This document applies to passive filter units for electromagnetic interference suppression for which safety tests are appropriate. This implies that filters specified according to this document will either be connected to mains supplies, when compliance with the mandatory tests of Table B.1 is necessary, or used in other circuit positions where the equipment specification specifies that some or all of these safety tests are required. This document applies to passive filter units, which will be connected to an AC mains or other supply (DC or AC) with a nominal voltage not exceeding 1 000 V AC, with a nominal frequency not exceeding 400 Hz, or 1 500 V DC. Note: For AC use, IEC 60384-14 applies to capacitors which will be connected to AC mains with a nominal frequency not exceeding 100 Hz. This document covers appliance filters (US) but does not cover facility filters, cord-connected filters or direct plug-in filters. These other filters will be covered by another sectional specification. This edition includes the following significant technical changes with respect to the previous edition: a) separated clauses for safety and performance tests; b) added note for use of multiple X capacitors bridging basic insulation in 3 phase filters; c) characteristics and conditions to substitute X and Y capacitors are now described in a separate Subclause 4.1; d) creepage and clearance tables updated and in line with the latest editions of IEC 60938-2 and IEC 60664-1; e) allowing voltage measurement for inductance measurements (7.3); f) added requirements for marking depending on remaining energy after disconnection; g) added content of CTL DSH 2044:2016 for temperature test of IEC filters; h) added note about temperature rise required specimens for safety testing; i) changed index of capacitors in Annex A to avoid confusion between index name and capacitor class; j) moved tests from group 1A to 2. Now, samples in group 1A need to be submitted without potting; k) revision of all parts of the document has taken place based on the ISO/IEC Directives, Part 2:2021, and harmonization with other similar kinds of documents. Annex X contains all cross-references of changes in clause/subclause numbers.
- Standard84 pagesEnglish languagesale 10% offe-Library read for1 day
IEC 60939-3:2024 is available as IEC 60939-3:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60939-3:2024 covers passive filters used to attenuate unwanted radio-frequency signals (such as noise or interference) generated from electromagnetic sources. Both single and multi-channel filters within one enclosure or which are built on a printed circuit board forming a compact entity are included within the scope of this document. This document applies to passive filter units for electromagnetic interference suppression for which safety tests are appropriate. This implies that filters specified according to this document will either be connected to mains supplies, when compliance with the mandatory tests of Table B.1 is necessary, or used in other circuit positions where the equipment specification specifies that some or all of these safety tests are required. This document applies to passive filter units, which will be connected to an AC mains or other supply (DC or AC) with a nominal voltage not exceeding 1 000 V AC, with a nominal frequency not exceeding 400 Hz, or 1 500 V DC. Note: For AC use, IEC 60384-14 applies to capacitors which will be connected to AC mains with a nominal frequency not exceeding 100 Hz. This document covers appliance filters (US) but does not cover facility filters, cord-connected filters or direct plug-in filters. These other filters will be covered by another sectional specification.
This edition includes the following significant technical changes with respect to the previous edition:
a) separated clauses for safety and performance tests;
b) added note for use of multiple X capacitors bridging basic insulation in 3 phase filters;
c) characteristics and conditions to substitute X and Y capacitors are now described in a separate Subclause 4.1;
d) creepage and clearance tables updated and in line with the latest editions of IEC 60938-2 and IEC 60664-1;
e) allowing voltage measurement for inductance measurements (7.3);
f) added requirements for marking depending on remaining energy after disconnection;
g) added content of CTL DSH 2044:2016 for temperature test of IEC filters;
h) added note about temperature rise required specimens for safety testing;
i) changed index of capacitors in Annex A to avoid confusion between index name and capacitor class;
j) moved tests from group 1A to 2. Now, samples in group 1A need to be submitted without potting;
k) revision of all parts of the document has taken place based on the ISO/IEC Directives, Part 2:2021, and harmonization with other similar kinds of documents. Annex X contains all cross-references of changes in clause/subclause numbers.
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- Amendment9 pagesEnglish languagesale 10% offe-Library read for1 day
IEC 60939-2:2005 applies to passive filter units for electromagnetic interference suppression which fall within the scope of the Generic Specification IEC 60939-1. The scope of this Sectional specification is restricted to passive filter units for which safety tests are appropriate. This implies that filters specified according to this Sectional specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 3 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required. The contents of the corrigendum of November 2005 have been included in this copy.
- Standard43 pagesEnglish languagesale 15% off
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This standard applies to incoming filters used to control the coupling of signals between the utility area and the consumer area. The standard defines: the minimum impedance in the relevant frequency bands at both Utility port and Consumer port, the minimum attenuation of unwanted signals transmitted from the utility side to the consumer side and vice versa. This standard applies to incoming filters designed for single or multiphase installations.
- Standard6 pagesEnglish languagesale 10% offe-Library read for1 day
This standard applies to segmentation filters in a mains communication system intended for utility networks or household and similar fixed installation including residential, commercial and light industrial buildings. These filters are used to control the coupling of signals between two areas of a mains communication system. The standard defines in the relevant frequency range: the minimum impedance at both ports of the filter, the minimum attenuation of signals transmitted between the ports of the filter.
- Standard6 pagesEnglish languagesale 10% offe-Library read for1 day
This standard applies to decoupling filters installed on the low voltage mains network and operating in the frequency range 3 kHz to 148,5 kHz. It does not apply to EMI suppression filters incorporated in household equipment or other general electric equipment. It specifies the definitions, requirements and test methods of the functional, technical and environmental characteristics of the decoupling filter, e.g. impedance, transfer function, voltage drop, leakage current and power dissipation. The impedance and the transfer function are referred to the decoupling filter mains power ports.
- Standard15 pagesEnglish languagesale 10% offe-Library read for1 day
This standard applies to impedance filters in a mains communication system intended for utility networks or household and similar fixed installation including residential, commercial and light industrial buildings. These filters are used to set a suitable impedance, in the nominal frequency range of the mains signalling system, at any point of the low voltage mains network where a low impedance equipment is connected, in order to allow reliable operation of mains signalling system. Impedance filters can be used either in utility or consumer networks. They may also be used in conjunction with incoming filters and segmentation filters.
- Standard6 pagesEnglish languagesale 10% offe-Library read for1 day
This standard applies to phase couplers in a mains communication system intended for household and similar fixed installation including residential, commercial and light industrial buildings. Phase couplers are used to control the coupling of communication signals between phases or sections of a mains communication system. The standard defines the requirements to ensure a minimum coupling between the phases or sections, and the requirements to ensure no change on the safety of the electrical installation.
- Standard7 pagesEnglish languagesale 10% offe-Library read for1 day
This document applies to segmentation filters in a mains communication system intended for utility networks or household and similar fixed installation including residential, commercial and light industrial buildings. These filters are used to control the coupling of signals between two areas of a mains communication system, as illustrated in Figure 1. This document defines in the relevant frequency range: - the minimum impedance at both ports of the filter, - the minimum attenuation of signals transmitted between the ports of the filter. [Figure 1 - Application of segmentation filters]
- Standard6 pagesEnglish languagesale 10% offe-Library read for1 day
This document applies to impedance filters in a mains communication system, intended for utility networks or household and similar fixed installation including residential, commercial and light industrial buildings. These filters are used to set a suitable impedance, in the nominal frequency range of the mains signalling system, at any point of the low voltage mains network where a low impedance equipment is connected, as shown in Figure 1, in order to allow reliable operation of the mains signalling system. Impedance filters can be used either in utility or consumer networks. They can also be used in conjunction with incoming filters and segmentation filters. [Figure 1 - The application of impedance filters]
- Standard6 pagesEnglish languagesale 10% offe-Library read for1 day
This document applies to phase couplers in a mains communication system intended for utility networks or household and similar fixed installation including residential, commercial and light industrial buildings. Phase couplers are used to control the coupling of communication signals between phases or sections of a mains communication system. This document defines - the requirements to ensure a minimum coupling between the phases or sections of a mains communication system, and - the requirements to ensure no change on the safety of the electrical installation.
- Standard7 pagesEnglish languagesale 10% offe-Library read for1 day
This document applies to decoupling filters installed on the low voltage mains network and operating in the frequency range 3 kHz to 148,5 kHz. It does not apply to EMI suppression filters incorporated in household equipment or other general electric equipment. It specifies the definitions, requirements and test methods of the functional, technical and environmental characteristics of the decoupling filter, e.g. impedance, transfer function, voltage drop, leakage current and power dissipation. The impedance and the transfer function are referred to the decoupling filter mains power ports (see Figure 1).
- Standard15 pagesEnglish languagesale 10% offe-Library read for1 day
This document applies to incoming filters used to control the coupling of signals between the utility area and the consumer area, as illustrated in Figure 1. This document defines: - the minimum impedance in the relevant frequency band(s) at both utility port and consumer port, - the minimum attenuation of unwanted signals transmitted from the utility side to the consumer side and vice versa. This document applies to incoming filters designed for single or multiphase installations. [Figure 1 - The application of incoming filter]
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IEC - Corrected version
- Corrigendum3 pagesEnglish languagesale 10% offe-Library read for1 day
IEC 60939-3:2015 covers passive filters used to attenuate unwanted radio-frequency signals (such as noise or interference) generated from electromagnetic sources. Both single and multi-channel filters within one enclosure or which are built on a printed circuit board forming a compact entity are included within the scope of this specification. This specification applies to passive filter units for electromagnetic interference suppression for which safety tests are appropriate. This implies that filters specified according to this specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 3 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required. This specification applies to passive filter units, which will be connected to an a.c. mains or other supply (d.c. or a.c.) with a nominal voltage not exceeding 1 000 V a.c., with a nominal frequency not exceeding 400 Hz, or 1 500 V d.c.
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IEC - Corrected version
- Corrigendum3 pagesEnglish languagesale 10% offe-Library read for1 day
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IEC corrigendum
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IEC corrigendum
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This part of IEC 60862 specifies the methods of test and general requirements for SAW filters
of assessed quality using either capability approval or qualification approval procedures.
- Standard48 pagesEnglish languagesale 10% offe-Library read for1 day
This specification covers passive filters used to attenuate unwanted radio-frequency signals
(such as noise or interference) generated from electromagnetic sources.
Both single and multi-channel filters within one enclosure or which are built on a printed
circuit board forming a compact entity are included within the scope of this specification.
Filters constructed of capacitive elements where the inductance is inherent in the construction
of the filter are within the scope of this specification. Similarly, filters constructed of inductive
elements where the capacitance is inherent in the construction of the filter are also within the
scope of this specification. It is up to the manufacturer to state whether a given component is
to be designed as a capacitor, an inductor or a filter. Filters can include also other
components like resistors and/or varistors or similar components
This specification applies to passive filter units for electromagnetic interference suppression
for which safety tests are appropriate. This implies that filters specified according to this
specification will either be connected to mains supplies, when compliance with the mandatory
tests of Table 3 is necessary, or used in other circuit positions where the equipment
specification prescribes that some or all of these safety tests are required.
This specification applies to passive filter units, which will be connected to an a.c. mains or
other supply (d.c. or a.c.) with a nominal voltage not exceeding 1 000 V a.c., with a nominal
frequency not exceeding 400 Hz, or 1 500 V d.c.
NOTE For a.c. use, IEC 60384-14 applies to capacitors which will be connected to a.c. mains with a nominal
frequency not exceeding 100 Hz.
This specification covers appliance filters (US) but does not cover facility filters, cordconnected
filters or direct plug-in filters. These other filters will be covered by another
sectional specification.
- Standard78 pagesEnglish languagesale 10% offe-Library read for1 day
IEC 60939-3:2015 covers passive filters used to attenuate unwanted radio-frequency signals (such as noise or interference) generated from electromagnetic sources. Both single and multi-channel filters within one enclosure or which are built on a printed circuit board forming a compact entity are included within the scope of this specification. This specification applies to passive filter units for electromagnetic interference suppression for which safety tests are appropriate. This implies that filters specified according to this specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 3 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required. This specification applies to passive filter units, which will be connected to an a.c. mains or other supply (d.c. or a.c.) with a nominal voltage not exceeding 1 000 V a.c., with a nominal frequency not exceeding 400 Hz, or 1 500 V d.c. The contents of the corrigendum of April 2016 and May 2018 have been included in this copy.
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This part of IEC 60862 gives practical guidance on the use of SAW filters which are used in telecommunications, measuring equipment, radar systems and consumer products. IEC 60862-1 should be referred to for general information, standard values and test conditions. SAW filters are now widely used in a variety of applications such as TV, satellite communications, optical fibre communications, mobile communications and so on. While these SAW filters have various specifications, many of them can be classified within a few fundamental categories. This part of IEC 60862 includes various kinds of filter configuration, of which the operating frequency range is from approximately 10 MHz to 3 GHz and the relative bandwidth is about 0,02 % to 50 % of the centre frequency. It is not the aim of this standard to explain theory, nor to attempt to cover all the eventualities which may arise in practical circumstances. This standard draws attention to some of the more fundamental questions, which should be considered by the user before he places an order for a SAW filter for a new application. Such a procedure will be the user's insurance against unsatisfactory performance. Standard specifications, given in IEC 60862 series, and national specifications or detail specifications issued by manufacturers, define the available combinations of nominal frequency, pass bandwidth, ripple, shape factor, terminating impedance, etc. These specifications are compiled to include a wide range of SAW filters with standardized performances. It cannot be over-emphasized that the user should, wherever possible, select his SAW filters from these specifications, when available, even if it may lead to making small modifications to his circuit to enable standard filters to be used. This applies particularly to the selection of the nominal frequency.
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This generic specification relates to passive filter units for electromagnetic interference suppression for use within, or associated with, electronic or electrical equipment and machines. Both single and multi-channel filters within one enclosure are included within the scope of this generic specification. Filters constructed of capacitive elements where the inductance is inherent in the construction of the filter are within the scope of this specification. Similarly, filters constructed of inductive elements where the capacitance is inherent in the construction of the filter are also within the scope of this generic specification. The manufacturer should state whether a given component is to be designed as a capacitor, an inductor or a filter. The filter units within the scope of this generic specification are further distinguished as those for which safety tests are appropriate (e.g. those connected to mains supplies) and those for which such tests are not appropriate. A separate sectional specification covers the passive filter units for which safety tests are appropriate. This generic specification establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications within the IECQ-CECC system for electronic components.
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IEC 60939-1:2010 relates to passive filter units for electromagnetic interference suppression for use within, or associated with, electronic or electrical equipment and machines. Both single and multi-channel filters within one enclosure are included within the scope of this generic specification. This generic specification establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications within the IECQ-CECC system for electronic components. This edition includes the following significant technical changes with respect to the previous edition: a) table 3 has been updated, specifying how to handle the Neutral by 3-phase filter with Neutral; b) all details about 'Quality assessment' have been deleted in this edition, because this standard is a safety standard; c) filters shall be subjected to Test Aa of IEC 60068-2-1 for 16 h, using the degree of severity of the lower category temperature as prescribed in the relevant specification; d) since IEC 60068-2-20 does no longer make a difference between Method 1A and 1B, but only describes Method 1, references to the method to be used are updated.
- Standard38 pagesEnglish languagesale 10% offe-Library read for1 day
IEC 60939-1:2010 relates to passive filter units for electromagnetic interference suppression for use within, or associated with, electronic or electrical equipment and machines. Both single and multi-channel filters within one enclosure are included within the scope of this generic specification. This generic specification establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications within the IECQ-CECC system for electronic components. This edition includes the following significant technical changes with respect to the previous edition:
a) table 3 has been updated, specifying how to handle the Neutral by 3-phase filter with Neutral;
b) all details about "Quality assessment" have been deleted in this edition, because this standard is a safety standard;
c) filters shall be subjected to Test Aa of IEC 60068-2-1 for 16 h, using the degree of severity of the lower category temperature as prescribed in the relevant specification;
d) since IEC 60068-2-20 does no longer make a difference between Method 1A and 1B, but only describes Method 1, references to the method to be used are updated.
- Standard68 pagesEnglish and French languagesale 15% off
This document was prepared to give users general advices on filtering solutions adopted in shielded enclosures. It is mainly a collection of hints derived from practical experience. This document is coordinated with EN 50147-1 and EN 50417-2. The document covers the frequency range DC to 40 GHz. The range above 40 GHz and up to 400 GHz is under consideration.
- Technical report8 pagesEnglish languagesale 10% offe-Library read for1 day
This document was prepared to give users general advices on filtering solutions adopted in shielded enclosures. It is mainly a collection of hints derived from practical experience. This document is coordinated with EN 50147-1 and EN 50417-2. The document covers the frequency range DC to 40 GHz. The range above 40 GHz and up to 400 GHz is under consideration.
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- Amendment3 pagesEnglish languagesale 10% offe-Library read for1 day
This European product safety standard applies to the filter part of portable devices for household and similar uses (hereafter referred to as portable decoupling filters) consisting of the filter part, a plug or an appliance inlet or a provision for connection by terminals or with a non-rewirable cord and one (multiple) socket-outlet or an appliance outlet. They are intended for single-phase circuits for nominal currents not exceeding 16 A and for nominal voltages not exceeding 250 V a.c. to neutral operating in the frequency range 3 kHz to 148,5 kHz and from 1,6 MHz to 30 MHz. The filtering functions are described in EN 50065-4-1. This standard does not cover phase couplers. Portable decoupling filters shall not be used as part of the fixed installation, where EN 50065-4-2 applies. Plugs and socket-outlets connected to the filter part and plugs and socket-outlets integrated with the filter part shall comply with the relevant national standard(s). Appliance inlets and appliance outlets connected to the filter part shall comply with the relevant parts of the EN 60320 series. Appliance inlets and appliance outlets integrated with the filter parts are not covered by this standard. This standard can be used for portable mains communication devices when no other product standard exists. This standard can be used for other portable mains filters other than those described in EN 50065-4-1 when no other product standard exists. Filters including batteries are not covered by this standard.
- Standard48 pagesEnglish languagesale 10% offe-Library read for1 day
- Amendment10 pagesEnglish languagesale 10% offe-Library read for1 day
This European Standard applies to phase couplers in a mains communication system for phase to neutral voltage not exceeding 250 V a.c. and a nominal current not exceeding 125 A, intended for household and similar fixed installation including residential, commercial and light industrial buildings. This European Standard applies to phase couplers used to control the coupling of communication signals between phases or sections of a mains communication system. A “phase coupler” may be used to achieve coupling between the phases of a multiphase installation, or to provide bridging of signals around other system components. The standard defines the requirements to ensure a minimum coupling between the sections, and the requirements to ensure no change on the safety of the electrical installation.
- Standard8 pagesEnglish languagesale 10% offe-Library read for1 day
This European product safety standard applies to the filter part of portable devices for household and similar uses (hereafter referred to as portable decoupling filters) consisting of the filter part, a plug or an appliance inlet or a provision for connection by terminals or with a non-rewirable cord and one (multiple) socket-outlet or an appliance outlet. They are intended for single-phase circuits for nominal currents not exceeding 16 A and for nominal voltages not exceeding 250 V a.c. to neutral operating in the frequency range 3 kHz to 148,5 kHz and from 1,6 MHz to 30 MHz. The filtering functions are described in EN 50065-4-1. This standard does not cover phase couplers. Portable decoupling filters shall not be used as part of the fixed installation, where EN 50065-4-2 applies. Plugs and socket-outlets connected to the filter part and plugs and socket-outlets integrated with the filter part shall comply with the relevant national standard(s). Appliance inlets and appliance outlets connected to the filter part shall comply with the relevant parts of the EN 60320 series. Appliance inlets and appliance outlets integrated with the filter parts are not covered by this standard. This standard can be used for portable mains communication devices when no other product standard exists. This standard can be used for other portable mains filters other than those described in EN 50065-4-1 when no other product standard exists. Filters including batteries are not covered by this standard.
- Standard48 pagesEnglish languagesale 10% offe-Library read for1 day
applies to passive filter units for electromagnetic interference suppression which fall within the scope of the Generic Specification EN 60939-1. The scope of this Sectional specification is restricted to passive filter units for which safety tests are appropriate. This implies that filters specified according to this Sectional specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 3 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required.
- Standard47 pagesEnglish languagesale 10% offe-Library read for1 day
is a supplementary document to the sectional specification and contains requirements for style and layout and minimum content of detail specifications. In the preparation of detail specifications, the content of 1.4 of the sectional specification shall be taken into account. The use of EN 60939-2-2 may be more appropriate for components where approval and requalification tests contribute considerably to the cost of the product, whereas the employment of this specification may be necessary for components manufactured in mass production. This specification offers the assessment levels D and DZ (Zero defect).
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forms the basis for a uniform procedure for a common Safety Mark. It implements the approval schedule for the safety test described in EN 60939-2, requires a declaration of design for parameters relevant to safety and prescribes conformance tests to be conducted on every lot prior to its release and requalification tests depending on changes to the declared design.
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Lists the test and measurement procedures which may be selected for use in detail specifications for filters using waveguide type dielectric resonators.
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Draws attention to some of the more fundamental questions which should be considered by the user before he places an order for dielectric filters for a new application. Is limited to filters using waveguide type dielectric resonators that are used for microwave applications such as portable phones, cellular base stations and radio links.
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This European Standard applies to phase couplers in a mains communication system for phase to neutral voltage not exceeding 250 V a.c. and a nominal current not exceeding 125 A, intended for household and similar fixed installation including residential, commercial and light industrial buildings.
This European Standard applies to phase couplers used to control the coupling of communication signals between phases or sections of a mains communication system.
A “phase coupler” may be used to achieve coupling between the phases of a multiphase installation, or to provide bridging of signals around other system components.
The standard defines
the requirements to ensure a minimum coupling between the sections, and
the requirements to ensure no change on the safety of the electrical installation.
- Standard8 pagesEnglish languagesale 10% offe-Library read for1 day
applies to passive filter units for electromagnetic interference suppression which fall within the scope of the Generic Specification EN 60939-1. The scope of this Sectional specification is restricted to passive filter units for which safety tests are appropriate. This implies that filters specified according to this Sectional specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 3 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required.
- Standard47 pagesEnglish languagesale 10% offe-Library read for1 day