WG 11 - TC 78/WG 11

IEC 61477:2009 gives the minimum requirements relative to specification, manufacture, selection, application and maintenance of tools, devices and equipment for live working. It provides the type of information which is useful to skilled persons in order to make the use of tools, devices and equipment safer. This type of information includes:
- the characteristics of tools, devices and equipment;
- their conditions for use;
- their conditions for maintenance;
- their conditions for storage and transportation.
Such information may be given in standards, manufacturer's instructions for use and in internal regulations set forth by companies for their own employees. Such information should be completed by work methods, which are excluded from the scope of this standard. This second edition of IEC 61477 cancels and replaces the first edition published in 2001, its Amendment 1 (2002) and Amendment 2 (2004). The contents of the corrigendum of April 2009 have been included in this copy.

Provides elements for product conformity assessment. Critical defects on tools, devices and equipment for live working are not acceptable. Major defects on tools, devices and equipment for live working are likely to result in failure or in a significant reduction of functionality, while minor defects do not reduce significantly the functionality. This standard defines assessment methods for products having completed production phase to assure that they conform to the requirements of the corresponding product standard. It is to be used in conjunction with live working corresponding product standards. The following elements are not covered by the present document, but are included in each product standard: - type tests; - provisions and description for sampling and routine tests; - the identification and classification of the corresponding defects resulting from a risk analysis. This third edition cancels and replaces the first edition which was issued as a technical report in 1994 with its Corrigendum 1 (2000), and the second edition, withdrawn, which was issued as a standard in 2003. It includes the following significant technical changes from the previous edition: - change of the purpose of the document from a support to standard writers to a standard for assessing the conformity by testing of products having completed the production phase; - clarification of the definitions of critical, major and minor defects; - specification of ISO 2859 for the manufacturers to define the appropriate sampling plans; - review of the acceptance quality limit (AQL) to specify lower limits.

This Technical Report covers procedures for the installation and maintenance of optical fibre cables on overhead power lines. This includes: - optical ground wire (OPGW) fibre cable; - optical phase conductor (OPPC) fibre cable; - optical attached fibre cable (OPAC); - all dielectric self supporting (ADSS) optical fibre cable. Optical fibre cables are considered for single and multi-circuit constructions in common use within some countries. The primary concern is the necessary precautions to ensure the safety of personnel and equipment when installing or maintaining these types of optical fibre cable on overhead power lines.

Gives the minimum requirements relative to specification, manufacture, selection, application and maintenance of tools, devices and equipment for live working. It provides the type of information which is useful to skilled persons in order to make the use of tools, devices and equipment safer.

Describes a method for calculating the minimum approach distances for live working, at maximum voltages between 72,5 kV and 800 kV. This standard addresses system overvoltages, and the working air distances between parts and/or workers at different potentials. The required withstand voltage and minimum approach distances calculated by the method described in this standard are evaluated taking into consideration the following: - workers are trained for, and skilled in, working in the live working zone; - the anticipated overvoltages do not exceed the value selected for the determination of the required minimum approach distance; - transient overvoltages are the determining overvoltages; - tool insulation has no continuous film of moisture present on the surface; - no lightning is seen or heard within 10 km of the work site; - allowance is made for the effect of conducting components of tools; - the effect of altitude on the electric strength is taken into consideration. For conditions other than the above, the evaluation of the minimum approach distances may require specific data, derived by other calculation or obtained from additional laboratory investigations on the actual situation. The contents of the corrigenda of May 2005 and November 2006 have been included in this copy.

Specifies a method for calculating the minimum approach distance for live working, at voltages between 1 kV and 800 kV, required to protect workers from system overvoltages. This standard addresses system overvoltages, and the working air distances between parts and/or workers at different potentials. The calculation of distances for d.c. voltages is presently under consideration.

Defines the parameters to be used in the development of standards related to tools and equipment used in live working.

Provides an informative guide on care, maintenance and in-service testing requirements of aerial devices with insulating booms used for live working. This specification is not a replacement for manufacturers' recommendations but rather a supplement containing critical generic requirements. In all cases, the manufacturers' specification and reasonable recommendations regarding use, care, maintenance, repairs and adjustments shall be adhered to.