IEC 61478 pdf download

IEC 61478 pdf download Live working – Ladders of insulating material
1 scope
This International Standard is applicable to fully insulating spliced or hook ladders withextension or having a combination of insulating and conductive sections and used for liveworking on a.c. or d.c. electrical installations at 1 000 v and above for a.c. and 1 500 V andabove for d.c.
The ladders are classified functionally as Category 1 and Category 2.
This standard concerns only ladders made of synthetic material.
These ladders are used, to provide access, generally on overhead line structures and tofacilitate live working,either hot stick, barehanded or a combination of both.
2Normative 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 editionof the referenced document (including any amendments) applies.
IEC 60050(151):2001,International Electrotechnical Vocabulary (IEV) – Chapter 151:Electricaland magnetic devices
IEC 60212:1971,Standard conditions for use prior to and during the testing of solid electricalinsulating materials
IEC 60417(all parts)[DB-2000] 1),Graphical symbols for use on equipment
IEC 60743,Live working – Terminology for tools,equipment and devices
IEC 60855:1985,Insulating foam-filled tubes and solid rods for live working
IEC 61235:1993,Live working – Insulating hollows tubes for electrical purposes
IEC 61318:1994,Live working – Guidelines for quality assurance plans
ISO 2859-1:1999，Sampling procedures for inspection by attributes – Part 1: Samplingschemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection
ISO 9000: 2000, Quality management systems – Fundamentals and vocabulary
ISO 9001 :2000, Quality management systems – Requirements
ISO 9004:2000, Quality management and quality system elements – Guidelines for performance improvements
3 Definitions
For the purpose of this International Standard, the following definitions apply.
3.1
section
unit of a ladder consisting of a minimum of three rungs
3.2
base section
first element of a ladder designed to support other sections
NOTE It may be the highest or lowest element of a ladder .
3.3
spliced ladder
ladder constructed of sections that are made of metal or synthetic material and spliced together
[IEC 60743, 9.1 .3]
3.4
insulating hook ladder
insulating ladder equipped to one end with permanent or removable hooks which can be rigid or can rotate
[IEC 60743, 9.1 .4]
3.5
insulating ladder extension
additional insulating section which can be fixed to an insulating hook ladder or another ladder extension
[IEC 60743, 9.1 .5]
3.6
support bracket
device designed to be fastened to any level of the structure and supporting the load of the spliced ladder
NOTE It may also be fitted to the structure between spliced ladder sections.
3.7
cradle
device designed to hold the ladder at a fixed distance from the structure on which it is positioned
3.8
fixing system
link device designed to hold the ladder firmly to the structure
3.9
connecting device
constructive arrangement allowing the connection of two ladder extensions or one ladder extension and one base section