IEC 61229 pdf download.Rigid protective covers for live working on a.c. installations
International Standard IEC 61229 is applicable to rigid insulating covers for live working on a.c. installations, including those described in IEC 60743. The barriers, having dielectric withstand which depends on the positioning clearance, are excluded from this standard. 1.1 Classes Six classes of covers, differing in electrical characteristics, are provided and designated as class 0, 1, 2, 3, 4 and 5. 1.2 Categories Five categories of covers, differing in special properties related to acid, oil, extreme low temperature, extreme high temperature, and humidity are provided. They are designated A, H, C, W and P, respectively. 1.3 Types The type depends on the piece to be protected.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050(121):1978, International Electrotechnical Vocabulary – Chapter 121: Electro- magnetism IEC 60050(151):1978, International Electrotechnical Vocabulary – Chapter 151: Electrical and magnetic devices IEC 60050(601):1985, International Electrotechnical Vocabulary – Chapter 601: Generation, transmission and distribution of electricity – General IEC 60060-1:1989, High-voltage test techniques – Part 1: General definitions and test requirements IEC 60060-3:1976, High-voltage test techniques – Part 3: Measuring devices IEC 60212:1971, Standard conditions for use prior to and during the testing of solid electrical insulating materials IEC 60417 (all parts), Graphical symbols for use on equipment IEC 60743:1983, Terminology for tools and equipment to be used in live working
For the purpose of this International Standard, the following definitions apply. 3.1 Terms defined in accordance with IEC 60050(121), IEC 60050(151) and IEC 60050(601) 3.1.1 type test a test of one or more devices made to a certain design to show that the design meets certain specifications [IEV 151-04-15] 3.1.2 routine test a test to which each individual device is subjected during or after manufacture to ascertain whether it complies with certain criteria. [IEV 151-04-16] 3.1.3 sampling test a test on a number of devices taken at random from a batch [IEV 151-04-17] 3.1.4 acceptance test a contractual test to prove to the customer that the device meets certain conditions of its specification [IEV 151-04-20] 3.1.5 electrical puncture a disruptive breakdown through a solid insulant [IEV 121-03-13, modified] 3.1.6 flashover an arc by-passing an insulating body [IEV 121-03-14] 3.1.7 nominal voltage of a system a suitable approximate value of voltage used to designate or identify a system [IEV 601-01-21]3.2 Terms defined in accordance with IEC 61318 3.2.1 minor defect a minor defect is a defect that is not likely to reduce materially the usability of the unit or product for its intended purpose, or is a departure from established standards having little bearing on the effective use or operation of the unit (see 2.6 of IEC 61318) 3.2.2 major defect a major defect is a defect, other than critical, that is likely to result in failure, or to reduce materially the usability of the unit of product for its intended purpose (see 2.5 of IEC 61318) 3.2.3 critical defect a critical defect is a defect that judgment and experience indicate is likely to result in hazardous or unsafe conditions for individuals using, maintaining or depending upon the product; or a defect that judgment and experience indicate is likely to prevent performance of the function of a major end item (see 2.4 of IEC 61318) 3.3 Terms defined in accordance with IEC 60743 3.3.1 protective covers generally made of insulating material, they are used to cover live or non-energized elements in order to avoid accidental contact They can be rigid or flexible and either shaped or in sheets (see 1.5 of IEC 60743) NOTE In this standard the word “cover” includes the meaning “protective cover”. 3.3.2 conductor cover (rigid type) made of insulating rigid material and used to insulate conductive parts (see 4.1.3 of IEC 60743) 3.3.3 pin type insulator cover (rigid type) insulating cover used to cover pin type insulators (see 4.1.7 of IEC 60743) 3.4 Definitions of special terms used in this standard 3.4.1 tension set cover (dead-end assembly cover) insulating cover used to cover tension insulators 3.4.2 clamp cover insulating cover used to cover clamp 3.4.3 suspension set cover insulating cover used to cover suspension insulator strings 3.4.4 rigid composite insulator cover type protective cover used to cover post-type insulators 3.4.5 pole cover (rigid type) protective cover used to cover poles