SIST-TP IEC TR 60479-4:2020

SLOVENSKI STANDARD
01-junij-2020
Vplivi električnega toka na ljudi in živali – 4. del: Vplivi udarov strele
Effects of current on human beings and livestock - Part 4: Effects of lightning strokes
Ta slovenski standard je istoveten z:
ICS:
13.200 Preprečevanje nesreč in Accident and disaster control
katastrof
29.020 Elektrotehnika na splošno Electrical engineering in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

IEC TR 60479-4 ®
Edition 3.0 2020-02
TECHNICAL
REPORT
colour
inside
Effects of current on human beings and livestock –

Part 4: Effects of lightning strokes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.200; 29.020 ISBN 978-2-8322-7888-8

– 2 – IEC TR 60479-4:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
3.1 Definitions of technical terms . 7
3.2 Definitions of interactions . 9
4 Basic physics of lightning . 9
4.1 General . 9
4.2 Lightning occurrence . 11
4.3 Lightning flash characteristics . 12
4.4 Primary and secondary injuries . 12
4.5 Summary . 13
5 Interaction of strokes with human beings and livestock . 13
5.1 General . 13
5.2 Strike mechanisms . 14
5.2.1 Description of direct strike . 14
5.2.2 Description of contact voltage . 15
5.2.3 Description of side flash . 16
5.2.4 Description of step voltage . 16
5.2.4 Description of streamer current . 17
5.3 Specific matters regarding body response . 19
6 Effects of lightning strokes on the body of living beings . 20
6.1 General comments on effects on the body . 20
6.2 Comments on specific syndromes . 23
6.2.1 Keraunoparalysis . 23
6.2.2 Burns . 23
6.2.3 Comparison between effects of electric shock derived from electrical
systems and lightning . 24
7 Present considerations of causation . 26
7.1 Under investigation . 26
7.2 Electrical effects . 26
7.3 Thermal, field and radiation effects . 26
7.4 Traumatic injury . 26
7.5 Barotrauma . 27
7.6 Release of hormones . 27
8 Individual and crowd safety procedures . 27
8.1 General – "No place outdoors is safe" . 27
8.2 Individual actions . 27
8.3 Basic principles . 27
8.3.1 General . 27
8.3.2 Individual lightning safety in the outdoors (NOAA recommendations) . 28
8.3.3 Safe practice indoors . 28
8.4 Safety procedures for crowds . 29
Bibliography . 30

IEC TR 60479-4:2020 © IEC 2020 – 3 –
Figure 1 – Categorization of lightning types [4] . 10
Figure 2 – High resolution full climatology (HRFC) . 12
Figure 3 – Direct strike. 14
Figure 4 – Direct strike with no flashover and then with flashover . 15
Figure 5 – Contact potential . 15
Figure 6 – Side flash . 16
Figure 7 – Earth potential versus distance from the stroke base – 10 kA stroke, with
earth resistivity 100 Ωm . 17
Figure 8 – Examples of step voltages, assuming a uniform earth of constant resistivity,

and no surface flashover . 18
Figure 9 – Upward streamer . 19
Figure 10 – Current in establishment and in collapse of upward streamer . 19

Table 1 – Lightning injury and physical symptoms [8], [9], [10], [11], [12], [13], [17] . 22
Table 2 – Comparison of electrical and lightning injury [30], [34], [35], [40] . 25

– 4 – IEC TR 60479-4:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EFFECTS OF CURRENT ON HUMAN BEINGS AND LIVESTOCK –

Part 4: Effects of lightning strokes

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a Technical Report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC TR 60479-4, which is a Technical Report, has been prepared by IEC technical committee
64: Electrical installations and protection against electric shock.
This third edition cancels and replaces the second edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) lightning occurence and climatory effects around the world are depicted;
b) direct strike description is extended;
c) step voltage effects are expanded;
d) upward streamer explanation is enhanced;

IEC TR 60479-4:2020 © IEC 2020 – 5 –
e) other direct or indirect related effects to lightning injuries to the human body are specified;
f) various safety procedures and related possibilities with respect to the personsal danger of
lightning are presented.
The text of this Technical Report is based on the following documents:
Draft TR Report on voting
64/2369/DTR 64/2398/RVDTR
Full information on the voting for the approval of this Technical Report can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60479 series, published under the general title Effects of current on
human beings and livestock, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

– 6 – IEC TR 60479-4:2020 © IEC 2020
INTRODUCTION
IEC 60479-1 and IEC 60479-2 deal with the effect of electric shock derived from electrical
systems on the bodies of human beings and livestock. This document describes the influence
and effect of electricity in the form of lightning strikes. Lightning current can consist of several
uni-polar and/or bi-polar impulses
...