UNE-EN 61472-2014 AC-2015 PDF

Full title and description

STB UNE-EN 61472-2014 AC-2015 — Live working - Minimum approach distances for a.c. systems in the voltage range 72,5 kV to 800 kV - A method of calculation. This document is the UNE/EN adoption of the IEC/CENELEC standard that specifies a calculation method for the electrical component of minimum approach distances when performing live-line work on high-voltage a.c. systems.

Abstract

This standard gives a method to calculate the minimum approach distances required to protect personnel during live working on alternating-current systems with maximum voltages between 72,5 kV and 800 kV. It addresses system overvoltages and the working air distances or tool insulation between parts and/or workers at different electric potentials, and lists assumptions and boundary conditions (e.g., trained personnel, allowed overvoltage statistics, absence of nearby lightning, condition of tool insulation, and altitude effects). The corrigendum (AC:2015) provides editorial and technical corrections to the 2014 adoption.

General information

• Status: Current (active adoption with corrigendum AC:2015 recorded).
• Publication date: UNE-EN adoption published 5 February 2014; Corrigendum (AC:2015) published 23 December 2015.
• Publisher: UNE / AENOR (Spanish adoption of the EN/IEC text); original standard prepared under IEC TC 78 (Live working).
• ICS / categories: 13.260 (Protection against electric shock. Live working), 29.240.20 (Power transmission and distribution lines), 29.260.99 (Other electrical equipment for working in special conditions).
• Edition / version: UNE-EN 61472:2014 (based on EN/IEC 61472:2013) with Corrigendum UNE-EN 61472:2014/AC:2015.
• Number of pages: Varies by publisher/translation — examples include listings showing the main part as ~46–48 pages while the UNE publication listing shows extended packaging/format variations (publisher listings show 98 pages for some editions and 2 pages for the AC corrigendum).

Scope

The standard specifies a calculation method for the minimum approach distances needed when working live on a.c. electrical systems whose maximum system voltages lie between 72,5 kV and 800 kV. It is intended to determine the electrical component of the clearance (air gap or tool insulation) between workers, tools and live parts under specified statistical overvoltage conditions and environmental/operational assumptions. It does not replace site-specific risk assessments where different or exceptional conditions apply.

Key topics and requirements

• Method for calculation of minimum approach distances for a.c. systems 72,5 kV to 800 kV.
• Consideration of system overvoltages (statistical and transient) in the distance calculation.
• Assumptions and boundary conditions: trained personnel, acceptable overvoltage limits, tool insulation condition (no continuous moisture film), no lightning within ~10 km, and allowance for conductive tool components.
• Altitude and air-insulation strength effects on required withstand voltages and distances.
• Inclusion of corrigendum (AC:2015) that amends/corrects specific editorial or calculation details from the 2014 adoption.

Typical use and users

Primary users include transmission-system operators, utility live-line crews, live-working trainers and competency bodies, safety engineers, designers of live-working tools and insulating equipment, and national regulatory authorities. The standard is used to set safe working clearances, inform work procedures and training, and to support equipment and procedure certification for live-line maintenance on high-voltage networks.

Related standards

Related documents include the base IEC/EN 61472 series (editions and corrigenda), the IEC/EN parts addressing lower-voltage ranges (for example IEC 61472-2 for 1,0 kV to 72,5 kV), earlier and later editions/corrigenda of IEC 61472, and other live-working safety standards developed by IEC TC 78. Users should consider associated national adoptions (UNE-EN, BS EN, ÖVE/ÖNORM, etc.) and any national application rules or guidance.

Keywords

Live working; Minimum approach distance; Approach distances; Overvoltage; High-voltage; 72,5 kV to 800 kV; Live-line; Insulation; Tool clearance; IEC 61472; UNE-EN 61472; Corrigendum AC:2015.

FAQ

Q: What is this standard?

A: It is the UNE/EN adoption of the IEC method for calculating the minimum approach distances required for safe live working on a.c. systems with maximum voltages between 72,5 kV and 800 kV (UNE-EN 61472:2014, with Corrigendum AC:2015).

Q: What does it cover?

A: It covers the calculation method for the electrical component of minimum approach distances, including the treatment of system overvoltages, environmental factors (e.g., altitude), tool insulation conditions, and the assumptions under which the calculated distances are valid. It does not replace site-specific risk assessments for atypical conditions.

Q: Who typically uses it?

A: Transmission and distribution utilities, live-line maintenance teams and trainers, safety engineers, equipment designers, and national standards/adoption bodies — anyone responsible for specifying or enforcing safe clearances and procedures for live working on high-voltage a.c. systems.

Q: Is it current or superseded?

A: The UNE-EN 61472:2014 adoption with Corrigendum AC:2015 is recorded as the active adopted edition; the underlying EN is based on IEC technical work (users should confirm national publication status and any subsequent revisions or newer parts such as IEC 61472-2 when applying the standard). Check with your national standards body for the definitive national status and any later amendments.

Q: Is it part of a series?

A: Yes — the 61472 family (IEC/EN 61472) addresses minimum approach distances for live working across voltage ranges. In recent years the series has been extended/partitioned (for example IEC 61472-2 for 1,0 kV to 72,5 kV) and corrigenda have been issued to address technical/editorial points.

Q: What are the key keywords?

A: Live working; minimum approach distance; approach distances; overvoltage; high voltage (72,5 kV–800 kV); tool insulation; clearance; IEC 61472; UNE-EN 61472; AC:2015 (corrigendum).