ISO 4301-2:2020

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 4301-2
ISO/TC 96/SC 6
Cranes — Classification —
Secretariat: ANSI
Voting begins on:
Part 2:
2020-09-09
Mobile cranes
Voting terminates on:
2020-11-04
Appareils de levage à charge suspendue — Classification —
Partie 2: Grues mobiles
RECIPIENTS OF THIS DRAFT ARE INVITED TO
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Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 4301-2:2020(E)
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©
NATIONAL REGULATIONS. ISO 2020

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ISO/FDIS 4301-2:2020(E)

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© ISO 2020
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ISO/FDIS 4301-2:2020(E)

Contents  Page
Foreword .iv
Introduction .v
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Classification . 1
4.1 General . 1
4.2 Classification of the crane . 2
4.3 Classification of components and mechanisms . 3
4.3.1 General. 3
4.3.2 Group classification of mechanism . 4
4.3.3 Average displacements . 4
4.3.4 Minimum duration of use with full load . 4
Annex A (informative) Guidance for classification of mobile cranes and their components .6
© ISO 2020 – All rights reserved iii

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ISO/FDIS 4301-2:2020(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 96, Cranes, Subcommittee SC 6, Mobile
cranes.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
This third edition cancels and replaces the second edition (ISO 4301-2:2009), which has been technically
revised.
The main change compared to the previous edition is the introduction of the cycle-based classification
for mobile cranes equipment following ISO 4301-1:2016.
A list of all parts in the ISO 4301 series can be found on the ISO website.
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ISO/FDIS 4301-2:2020(E)

Introduction
Mobile cranes play a part in the handling of materials by raising and moving loads, the mass of which is
within their rated capacity. However, there can be wide variations in their duty. The design of the crane
should take account of the duty in terms of conditions of service, in order to reach an appropriate level
of safety and useful life which is in line with the purchaser’s requirements.
Classification serves as a reference framework between purchaser and manufacturer, by which a
particular mobile crane can be matched to the intended service. It also is the system used to provide a
means of establishing rational bases for the design of mobile cranes.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 4301-2:2020(E)
Cranes — Classification —
Part 2:
Mobile cranes
1  Scope
This document establishes a general classification of mobile cranes and related crane mechanisms
based on the service conditions, mainly expressed by the following:
— the total number of working cycles to be carried out during the specified design life of the crane;
— the load spectrum factor which represents the relative frequencies of loads to be handled;
— the average load displacements.
This document is applicable for the work spectrum between moderate to very heavy number of work
cycles as described in Table 2.
2  Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
ISO 4301-1, Cranes — Classification — Part 1: General
ISO 4306-1, Cranes — Vocabulary — Part 1: General
ISO 4306-2, Cranes — Vocabulary — Part 2: Mobile cranes
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4301-1, ISO 4306-1 and
ISO 4306-2 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4  Classification
4.1 General
For the purpose of classification, a crane working cycle is a sequence of movements which begins when
the crane is ready to hoist the load and ends when the crane is ready to hoist the next load within the
same task. A task can be characterized by a specific combination of crane configuration and sequence
of intended movements.
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ISO/FDIS 4301-2:2020(E)

4.2  Classification of the crane
The total number of working cycles, C, is the sum total of all working cycles during the design life of
the crane. The total number of crane working cycles during the design life of a crane can be separated
into the numbers of working cycles corresponding to several typical tasks. The total number of crane
working cycles is related to the frequency of use (e.g. daily) and the intended life (in years) of the crane.
For convenience, the range of the total number of mobile crane working cycles has been divided into
9 classes of utilization (see Table 1), identical to the corresponding classes in ISO 4301-1:2016.
Table 1 — Classes of utilizazion (U) of total numbers of mobile crane working cycles, C
Class of utilization Total number of mobile crane working cycles, C
4
U C ≤ 1,6 × 10
0
4 4
U 1,6 × 10 < C ≤ 3,15 × 10
1
4 4
U 3,15 × 10 < C ≤ 6,3 × 10
2
4 5
U 6
...