Standards World

IEC 60287-3-2:2012 pdf free download - Electric cables - Calculation of the current rating 0.1General part The procedure generally used for the selection of a cable size leads to the minimumadmissible cross-sectional area,which also minimizes the initial...

IEC 60255-5:2000 pdf free download - Electrical relays 4.2.2.1overvoltage categories The applicable overvoltage category shall be determined on the basis of the following criteria.ategory l Category l applies for measuring relays and protection equipment where special measuresare...

IEC 60227-2:2003 pdf free download - Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V 3.1.1 General The requirements are given in 5.6.3.1 of lEC 60227-1. This test does not apply to tinsel...

IEC 61334-6:2000 pdf free download - Distribution automation using distributionline carrier systems 6 Encoding procedures 6.1 Encoding of an INTEGER value A-XDR provides two types of encoding for the ASN.1 INTEGER type, depending on whether theASN.1 definition...

IEC 61000-4-3:2020 pdf free download - Electromagnetic compatibility (EMC) 1 Scope This part of lEC 61000 is applicable to the immunity requirements of electrical and electronicequipment to radiated electromagnetic energy. lt establishes test levels and the required...

IEC 61000-3-3:2021 pdf free download - Electromagnetic compatibility (EMC) 1 Scope This part of lEC 61000 is concerned with the limitation of voltage fluctuations and flickerimpressed on the public low-voltage system. lt specifies limits of voltage changes...

IEC 60974-10:2020 pdf free download - Arc welding equipment 4.3Artificial mains network Measurement of the mains terminal disturbance voltage shall be made using an artificialmains network,if commercially available，consisting of 50 Q/50 uH or 50 Q/50 uH +...

IEC 60947-6-2:2020 pdf free download - Low-voltage switchgear and controlgear 5.4.2 Assignment of utilization categories based on the results of tests a) A CPs which has been tested for one utilization category or at any combination of...

IEC 60947-4-3:2020 pdf free download - Low-voltage switchgear and controlgear 8.1.1General Subclause 8.1.1 of IEC 60947-1:2020 applies with the following addition. Measures shall be provided to reduce the likelihood of injury and property damage，underinstallation，maintenance，normal operation conditions，abnormal operation...

IEC 60947-4-2:2020 pdf free download - Low-voltage switchgear and controlgear 5.3.5.4.1 Starting characteristics of squirrel cage and hermetic refrigerationmotors a) One direction of rotation with the inclusion of phase-control capability to provide any combination of controlled acceleration...