Earth-moving machinery -- Safety

ISO 20474-12:2017 gives the safety requirements specific to cable excavators as defined in ISO 6165. It is intended to be used in conjunction with ISO 20474‑1, which specifies general safety requirements common to two or more earth-moving machine families. The specific requirements given in this document take precedence over the general requirements of ISO 20474‑1. ISO 20474-12:2017 deals with all significant hazards, hazardous situations and events relevant to the earth-moving machinery within its scope (see ISO 20474‑1:2017, Annex A) when used as intended or under conditions of misuse reasonably foreseeable by the manufacturer. It specifies the appropriate technical measures for eliminating or reducing risks arising from relevant hazards, hazardous situations or events during commissioning, operation and maintenance. It is applicable only to the machine itself if the cable excavator is intended for use in combination with other equipment or attachments such as drill rigs and those for pile driving or extracting and moving (e.g. rail-track, walking legs, pontoon, ship equipment or stationary undercarriages). It does not deal with the specific hazards relevant to such additional equipment or attachments. ISO 20474-12:2017 is not applicable to machines manufactured before the date of its publication.

Engins de terrassement -- Sécurité

General Information

Status
Published
Publication Date
06-Jul-2017
Current Stage
6060 - International Standard published
Start Date
07-Apr-2017
Completion Date
07-Jul-2017
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INTERNATIONAL ISO
STANDARD 20474-12
Second edition
2017-07
Earth-moving machinery — Safety —
Part 12:
Requirements for cable excavators
Engins de terrassement — Sécurité —
Partie 12: Exigences applicables aux pelles à câble
Reference number
ISO 20474-12:2017(E)
ISO 2017
---------------------- Page: 1 ----------------------
ISO 20474-12:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

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ii © ISO 2017 – All rights reserved
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ISO 20474-12:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Safety requirements and protective measures ..................................................................................................................... 3

4.1 General ........................................................................................................................................................................................................... 3

4.2 Operator’s station ................................................................................................................................................................................. 3

4.2.1 General...................................................................................................................................................................................... 3

4.2.2 Roll-over protective structures (ROPS) ........................................................................................................ 3

4.2.3 Operator’s protective guard ................................................................................................................................... 3

4.3 Operator’s controls and indicators ........................................................................................................................................ 3

4.3.1 Controls for driving and steering ...................................................................................................................... 3

4.3.2 Warning indicator ........................................................................................................................................................... 3

4.4 Steering .......................................................................................................................................................................................................... 3

4.5 Swing brakes ............................................................................................................................................................................................. 4

4.6 Lift system ................................................................................................................................................................................................... 4

4.6.1 Force-controlled operation (lifting, lowering) ....................................................................................... 4

4.6.2 Free-fall operation .......................................................................................................................................................... 4

4.6.3 Switchover ............................................................................................................................................................................. 4

4.6.4 Boom .......................................................................................................................................................................................... 4

4.6.5 Ropes .......................................................................................................................................................................................... 4

4.6.6 Rope drum, rope pulley ........................................................................................................................................... ... 5

4.7 Limiting devices ..................................................................................................................................................................................... 5

4.7.1 Load moment limiting device ............................................................................................................................... 5

4.7.2 Lift limiting switch ......................................................................................................................................................... 5

4.7.3 Limit switch for the boom hoist system ...................................................................................................... 5

4.8 Calculation of the lift capacity .................................................................................................................................................... 5

4.8.1 Calculation method ........................................................................................................................................................ 5

4.8.2 Rated load table for object-handling application ................................................................................ 6

4.9 Safety-related parts of the control system ...................................................................................................................... 6

4.10 Stability .......................................................................................................................................................................................................... 6

4.10.1 General...................................................................................................................................................................................... 6

4.10.2 Stability in different applications ...................................................................................................................... 6

4.10.3 Dragline bucket ................................................................................................................................................................. 7

4.10.4 Grab and front shovel................................................................................................................................................... 7

4.10.5 Object-handling applications ................................................................................................................................ 7

4.11 Cable excavator with electrical power source ............................................................................................................. 7

5 Verification of safety requirements and protective measures ............................................................................. 7

6 Information for use ............................................................................................................................................................................................ 7

Annex A (normative) Requirements for cable excavator swing brakes ........................................................................... 9

Annex B (informative) Illustrations....................................................................................................................................................................12

Bibliography .............................................................................................................................................................................................................................15

© ISO 2017 – All rights reserved iii
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ISO 20474-12:2017(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 on 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 the following

URL: w w w . i s o .org/ iso/ foreword .html

This document was prepared by Technical Committee ISO/TC 127, Earth-moving machinery,

Subcommittee SC 2, Safety, ergonomics and general requirements.

This second edition cancels and replaces the first edition (ISO 20474-12:2008), which has been

technically revised with the following changes:
— normative references have been updated;

— references to national and regional provisions in the withdrawn ISO/TS 20474-14 have been deleted;

— new safety requirements and protective measures have been added, including requirements for the

operator’s protective guard.
It is intended to be used in conjunction with ISO 20474-1.

A list of all parts in the ISO 20474 series, published under the general title, Earth-moving machinery —

Safety, can be found on the ISO website.
iv © ISO 2017 – All rights reserved
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ISO 20474-12:2017(E)
Introduction
This document is a type-C standard as stated in ISO 12100.

The machinery concerned and the extent to which hazards, hazardous situations or hazardous events

are covered are indicated in the Scope of this document.

When requirements of this type-C standard are different from those which are stated in type-A or B

standards, the requirements of this type-C standard take precedence over the requirements of the

other standards for machines that have been designed and built according to the requirements of this

type-C standard.

ISO 20474 provides acceptable safety requirements for earth-moving machinery. This standard does

not necessarily provide requirements to meet all national and regional regulatory provisions, e.g. Japan

does not allow object handling with earth-moving machinery.
© ISO 2017 – All rights reserved v
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INTERNATIONAL STANDARD ISO 20474-12:2017(E)
Earth-moving machinery — Safety —
Part 12:
Requirements for cable excavators
1 Scope

This document gives the safety requirements specific to cable excavators as defined in ISO 6165. It

is intended to be used in conjunction with ISO 20474-1, which specifies general safety requirements

common to two or more earth-moving machine families. The specific requirements given in this

document take precedence over the general requirements of ISO 20474-1.

This document deals with all significant hazards, hazardous situations and events relevant to the earth-

moving machinery within its scope (see ISO 20474-1:2017, Annex A) when used as intended or under

conditions of misuse reasonably foreseeable by the manufacturer. It specifies the appropriate technical

measures for eliminating or reducing risks arising from relevant hazards, hazardous situations or

events during commissioning, operation and maintenance.

It is applicable only to the machine itself if the cable excavator is intended for use in combination with

other equipment or attachments such as drill rigs and those for pile driving or extracting and moving

(e.g. rail-track, walking legs, pontoon, ship equipment or stationary undercarriages). It does not deal

with the specific hazards relevant to such additional equipment or attachments.

This document is not applicable to machines manufactured before the date of its publication.

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 4310, Cranes — Test code and procedures
ISO 5010, Earth-moving machinery — Rubber-tyred machines — Steering requirements

ISO 6165, Earth-moving machinery — Basic types — Identification and terms and definitions

ISO 6014, Earth-moving machinery — Determination of ground speed

ISO 7546, Earth-moving machinery — Loader and front loading excavator buckets — Volumetric ratings

ISO 10262:1998, Earth-moving machinery — Hydraulic excavators — Laboratory tests and performance

requirements for operator protective guards

ISO 15219, Earth-moving machinery — Cable excavators — Terminology and commercial specifications

IEC 60204-32, Safety of machinery — Electrical equipment of machines — Part 32: Requirements for

hoisting machines
ISO 20474-1:2017, Earth-moving machinery — Safety — Part 1: General requirements
EN 791:1995, Drill rigs — Safety
© ISO 2017 – All rights reserved 1
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ISO 20474-12:2017(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 20474-1, ISO 15219, and the

following, apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
cable excavator

excavator having a wire-rope-operated upper structure designed primarily for excavation with a dragline

bucket, front shovel or grab, used for compacting material with a compaction plate, for demolition work

by hook or ball, and for material handling with special equipment (3.3) and attachments (3.2)

Note 1 to entry: See Annex B for illustrations.
Note 2 to entry: For the definition of excavator, see ISO 6165 or ISO 20474-5.
[SOURCE: ISO 6165:2012, 4.4.3, modified — By adding Notes 1 and 2.]
3.2
boom hoist system

boom system comprising lower, intermediate and head sections, and A-frame and boom hoist winch

systems
3.3
lift system

main winch system used for earth-moving, demolition, compaction and object-handling (e.g. with hook

assembly) applications
3.4
...

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