prEN ISO 20770-2

Drilling and foundation equipment - Safety - Part 2: Mobile drill rigs for civil and geotechnical engineering (ISO/DIS 20770-2:2025)

See attached draft

Geräte für Bohr- und Gründungsarbeiten - Sicherheit - Teil 2: Mobile Bohrgeräte für Tiefbau, Geotechnik und Gewinnung

Dieses Dokument behandelt zusammen mit ISO 20770 1 alle signifikanten Gefährdungen (siehe Anhang C) für mobile Bohrgeräte für den Tiefbau und die Geotechnik in Erde oder einer Mischung aus Erde und Gestein, wenn sie bestimmungsgemäß und unter den Bedingungen der Fehlanwendung, die vernünftigerweise vom Hersteller vorhersehbar sind und mit der gesamten Lebensdauer der Maschine in Verbindung stehen, verwendet werden.
Die Anforderungen in diesem Teil gelten zusätzlich zu den in ISO 20770 1:— gestellten gemeinsamen Anforderungen.
Das vorliegende Dokument wiederholt nicht die gemeinsamen Anforderungen von ISO 20770 1:—, sondern ergänzt oder ersetzt die Anforderungen für die Anwendung von mobilen Bohrgeräten.
In diesem Dokument umfasst der allgemeine Begriff „mobiles Bohrgerät“ mehrere verschiedene Maschinenarten zu folgender Verwendung:
   Tiefbau;
   Geotechnik (einschließlich Bodenuntersuchungen, Verankerung, Bodenvernagelung, Setzen von Minipfählen, Bodenstabilisierung, Verpressen/Injektion);
   Brunnenbau;
   geothermische Anlagen;
   Deponiebohrtechnik;
   Untermauerung und Tunnelbau;
   zur Verwendung über Tage ebenso wie unter Tage.
Üblicherweise erfordert das Bohrverfahren den Zusatz von Bohrgestängen, Rohren, Verrohrungen oder Bohrschnecken usw., normalerweise mit Gewinde, da das Bohrloch sich in der Tiefe erweitert.
ANMERKUNG 1   ISO 20770 1:— gilt für Maschinen mit einem Drehmoment über 35 kNm.
ANMERKUNG 2   Der Begriff „Bohrgerät“ umfasst Geräte mit einer gesonderten Antriebseinheit, die vom Gerätehersteller zur Verfügung gestellt wird.
Folgende Maschinen sind aus dem Anwendungsbereich dieses Dokuments ausgeschlossen:
   Tunnelbaumaschinen, Tunnelbohrmaschinen ohne Schild und gestängelose Schachtbohrmaschinen für Gestein entsprechend EN 16191;
   Aufbruchbohrmaschinen;
   Bohrgeräte, die in der Öl- und Gasindustrie verwendet werden;
   spezialisierte Bergbaumaschinen und Ausrüstung für den Tagebau (z. B. Gesteinsbohrgeräte, Sprenglochbohrer) (im Anwendungsbereich von ISO/TC 82);
   sämtliche Bergbaumaschinen für den Einsatz untertage und Ausrüstung zur Gewinnung fester mineralischer Substanzen (z. B. Gesteinsbohrgeräte, Aufbruchbohrmaschinen, Schachtbohrmaschinen, Schneckenbohrmaschinen, Bohrwagen) sowie Maschinen und Ausrüstung zur Entwicklung unterirdischer Minen (im Anwendungsbereich von ISO/TC 82);
   Kernbohrmaschinen auf Ständer, die nach EN 12348 abgedeckt sind;
   handgeführte Maschine (insbesondere Maschinen, die nach ISO 11148 5 abgedeckt sind).
Dieses Dokument gilt nicht für mobile Bohrgeräte zur tiefbautechnischen und geotechnischen Anwendung in Erde oder einer Mischung aus Erde und Gestein, die vor dem Veröffentlichungsdatum hergestellt wurden.

Machines de forage et de fondation - Sécurité - Partie 2: Machines de forage mobiles en génie civil et en ingénierie géotechnique (ISO/DIS 20770-2:2025)

Oprema za vrtanje in temeljenje - Varnost - 2. del: Prenosna vrtalna oprema za gradbeništvo in geotehniko (ISO/DIS 20770-2:2025)

General Information

• Status: Not Published
• Publication Date: 13-Sep-2026
• ICS: 53.100 - Earth-moving machinery
• Technical Committee: CEN/TC 151 - Construction equipment and building material machines - Safety
• Drafting Committee: CEN/TC 151/WG 3 - Drilling equipment - Safety
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 08-May-2025
• Due Date: 15-Feb-2025
• Completion Date: 08-May-2025
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 2023/1230 - Regulation (EU) 2023/1230 of the European Parliament and of the Council of 14 June 2023 on machinery and repealing Directive 2006/42/EC of the European Parliament and of the Council and Council Directive 73/361/EEC (Text with EEA relevance)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Mandate: M/605 - COMMISSION IMPLEMENTING DECISION of 20.1.2025 on a standardisation request to the European Committee for Standardization and to the European Committee for Electrotechnical Standardization as regards machinery and related products in support of Regulation (EU) 2023/1230 of the European Parliament and of the Council
• Ref Project: oSIST prEN ISO 20770-2:2025 - Drilling and foundation equipment - Safety - Part 2: Mobile drill rigs for civil and geotechnical engineering (ISO/DIS 20770-2:2025)

Relations

• Revises: EN 16228-2:2014+A1:2021 - Drilling and foundation equipment - Safety - Part 2: Mobile drill rigs for civil and geotechnical engineering, quarrying and mining
• Effective Date: 04-Oct-2023

Overview

prEN ISO 20770-2 (ISO/DIS 20770-2:2025) addresses safety for mobile drill rigs used in civil and geotechnical engineering. Circulated as a draft for comment, this Part 2 document complements the common requirements in ISO 20770-1 and focuses on hazards and protective measures specific to mobile rigs used above ground and underground. The standard covers significant hazards across the machine life cycle and provides normative annexes for testing and verification.

Key elements in scope: mobile drill rigs for ground investigation, anchoring, piling, grouting, geothermal and water well drilling. Exclusions include tunnelling machines, oil & gas rigs, and mining-specific machinery.

Key Topics

The draft standard organizes requirements to help manufacturers, safety managers and site engineers manage risk and demonstrate compliance. Key topics include:

• General safety principles and required protective/risk reduction measures.
• Strength and stability: guidance on stability calculations, tipping angles and operating condition considerations to reduce overturn and collapse risk.
• Braking systems: requirements and verification for service, secondary and parking brakes on wheel-mounted rigs; annexes define brake test procedures.
• Guards and sensitive protective devices: requirements for fixed guards and presence-sensing devices to prevent access to moving parts.
• Winches, draw-works and ropes: measures when operating on slopes and during lifting operations.
• Rod/auger guides and protection: measures addressing hazards during rod handling and bit/auger operation.
• Noise and fire protection: normative noise test code and guidance for fire protection measures.
• Special machine types: additional protections for suspended rigs, underground rigs and pre-armouring machines.

The document also includes Annex C, a list of significant hazards, and normative annexes for noise and brake testing.

Applications

This standard is intended for:

• Manufacturers designing mobile drill rigs to meet European/CEN and ISO expectations.
• OEM safety and compliance teams preparing technical documentation, user manuals and conformity evidence.
• Site managers and contractors integrating drill rigs into civil, geotechnical and geothermal projects.
• Test laboratories performing noise and brake verifications described in the annexes.

Practical benefits include improved operator protection, clearer requirements for stability and braking, reduced noise risk, and a harmonised basis for conformity assessment and procurement specifications.

Related Standards

• ISO 20770-1: Common requirements for drilling and foundation equipment (reference for torque thresholds; e.g. machines with rotary torque > 35 kNm are covered in Part 1).
• Relevant machinery safety standards and regional directives (see Annex ZA/ZB for alignment with EU Directives and Regulations).

For manufacturers and stakeholders, prEN ISO 20770-2 provides a targeted framework to manage hazards specific to mobile drill rigs and supports safer design, testing and use in civil and geotechnical engineering projects.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2025
Oprema za vrtanje in temeljenje - Varnost - 2. del: Prenosna vrtalna oprema za
gradbeništvo in geotehniko (ISO/DIS 20770-2:2025)
Drilling and foundation equipment - Safety - Part 2: Mobile drill rigs for civil and
geotechnical engineering (ISO/DIS 20770-2:2025)
Geräte für Bohr- und Gründungsarbeiten - Sicherheit - Teil 2: Mobile Bohrgeräte für
Tiefbau, Geotechnik und Gewinnung (ISO/DIS 20770-2:2025)
Machines de forage et de fondation - Sécurité - Partie 2: Machines de forage mobiles en
génie civil et en ingénierie géotechnique (ISO/DIS 20770-2:2025)
Ta slovenski standard je istoveten z: prEN ISO 20770-2
ICS:
25.080.40 Vrtalniki Drilling machines
53.100 Stroji za zemeljska dela Earth-moving machinery
93.020 Zemeljska dela. Izkopavanja. Earthworks. Excavations.
Gradnja temeljev. Dela pod Foundation construction.
zemljo Underground works
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 20770-2
ISO/TC 195/SC 3
Drilling and foundation
Secretariat: AFNOR
equipment — Safety —
Voting begins on:
Part 2:
2025-02-13
Mobile drill rigs for civil and
Voting terminates on:
2025-05-08
geotechnical engineering
Machines de forage et de fondation — Sécurité —
Partie 2: Machines mobiles de forage de génie civil et de
géotechnique
ICS: 53.100
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 20770-2:2025(en)
DRAFT
ISO/DIS 20770-2:2025(en)
International
Standard
ISO/DIS 20770-2
ISO/TC 195/SC 3
Drilling and foundation
Secretariat: AFNOR
equipment — Safety —
Voting begins on:
Part 2:
Mobile drill rigs for civil and
Voting terminates on:
geotechnical engineering
Machines de forage et de fondation — Sécurité —
Partie 2: Machines mobiles de forage de génie civil et de
géotechnique
ICS: 53.100
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 20770-2:2025(en)
ii
ISO/DIS 20770-2:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Safety requirements and/or protective/risk reduction measures . 3
4.1 General .3
4.2 Boom mounted working platforms for underground use .3
4.3 Requirements for strength and stability .4
4.3.1 Stability calculation - Tipping angle .4
4.3.2 Operating conditions .4
4.4 Fire protection .4
4.5 Guards and sensitive protective devices .5
4.5.1 General .5
4.5.2 Guards .5
4.5.3 Sensitive protective devices.6
4.6 Supplementary trip device . . .6
4.7 Protection against moving parts on specific machine types .7
4.7.1 General .7
4.7.2 Underground pre-armouring machine .7
4.7.3 Suspended drill rigs .7
4.8 Rod/auger guide .8
4.9 Winches, draw-works and ropes for movement on slopes .8
4.10 Brakes of the carrier machine .8
4.10.1 General .8
4.10.2 General requirements for wheel mounted mobile drill rigs .9
4.10.3 Service braking system for wheel mounted mobile drill rigs .9
4.10.4 Secondary braking system for wheel mounted mobile drill rigs .9
4.10.5 Parking braking system for rubber-tyred rigs .9
4.10.6 Verification of brakes .10
4.10.7 Braking systems for skid steer wheel mounted drill rigs .10
4.11 Noise .10
4.12 Special protective mode .10
5 Verification of the safety requirements and/or protective/risk reduction measures .10
5.1 General .10
5.2 Functional test .11
6 Information for use .12
6.1 General . 12
6.2 Drill rigs for underground operation . 12
6.3 Suspended drill rigs . 12
6.4 Special protective mode . 13
Annex A (normative) Noise test code . 14
Annex B (normative) Brake test for mobile drill rigs excluding truck and tractor mounted drill
rigs .15
Annex C (normative) List of significant hazards .18
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive2006/42/EC aimed to be covered . 19
Annex ZB (informative) Relationship between this European Standard and the essential
requirements of Regulation EU 2023/1230 aimed to be covered .24
Bibliography .30

iii
ISO/DIS 20770-2:2025(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO [had/had not] received notice of
(a) patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 195, Building construction machinery and
equipment, Subcommittee SC 3, Drilling and foundation machinery and equipment.
A list of all parts in the ISO 20770 series can be found on the ISO website.
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.

iv
ISO/DIS 20770-2:2025(en)
Introduction
This document is a type C standard as stated in ISO 12100:2010.
The machinery concerned and the extent to which hazards, hazardous situation and 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.
v
DRAFT International Standard ISO/DIS 20770-2:2025(en)
Drilling and foundation equipment — Safety —
Part 2:
Mobile drill rigs for civil and geotechnical engineering
1 Scope
This document together with ISO 20770-1, deals with all significant hazards (see Annex C) for mobile drill
rigs for in soil or soil and rock mixture in civil and geotechnical engineering, when they are used as intended
and under the conditions of misuse which are reasonably foreseeable by the manufacturer associated with
the whole life time of the machine.
The requirements of this part are complementary to the common requirements formulated in
ISO 20770-1:____.
This document does not repeat the common requirements from ISO 20770-1:____, but adds or replaces the
requirements for application for mobile drill rigs.
In this document the general term “mobile drill rig” covers several different types of machines for use in:
— civil engineering;
— geotechnical engineering (including ground investigation, anchoring, soil nailing, mini-piling, ground
stabilization, grouting);
— water well drilling;
— geothermal installations;
— landfill drilling;
— underpinning and tunnelling;
— for use above ground as well as underground.
Typically, the process of drilling involves the addition of drill rods, tubes, casings or augers etc., normally
threaded, as the borehole extends to depth.
NOTE 1 ISO 20770-1:____ covers machines with a rotary torque greater than 35 kNm.
NOTE 2 The term “drill rigs” includes rigs with a separate power pack supplied by the rig manufacturer.
The following machines are excluded from the scope of this document:
— tunnelling machines, unshielded tunnel boring machines and rodless shaft boring machines for rock
according to EN 16191;
— raise boring machines;
— drill rigs used in oil and gas industry;
— specialized mining machinery and equipment for opencast mining (e.g. rock drill rigs, blast hole drills)
(under the scope of ISO/TC 82);

ISO/DIS 20770-2:2025(en)
— all underground mining machinery and equipment for the extraction of solid mineral substances (e. g.
rock drill rigs, raise boring machines, shaft boring machines, mining auger boring machines, jumbos) as
well as machinery and equipment for underground mine development (under the scope of ISO/TC 82);
— core drilling machines on stand covered by EN 12348;
— hand-held machines (in particular machines covered by ISO 11148-5).
This document is not applicable to mobile drill rigs for in soil or soil and rock mixture in civil and geotechnical
engineering 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.
EN 280-1:2022, Mobile elevating work platforms - Part 1 : design calculations - Stability criteria - Construction
- Safety - Examinations and tests
1)
ISO 20770-1, ____ , Drilling and foundation equipment — Safety — Part 1: Common requirements
ISO 3449:2005, Earth-moving machinery — Falling-object protective structures — Laboratory tests and
performance requirements
ISO 3450:2011, Earth-moving machinery — Wheeled or high-speed rubber-tracked machines — Performance
requirements and test procedures for brake systems
2)
ISO 11886, ____ , Drilling and foundation machinery — Soil or soil and rock mixture drilling and foundation
machines —Commercial specifications
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13855:2010, Safety of machinery — Positioning of safeguards with respect to the approach speeds of parts
of the human body
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100:2010, ISO 11886:___,
ISO 20770-1:____ and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
NOTE Examples of drilling and foundation equipment are given in ISO/DIS 11886-1:2023, Annex C.
3.1
boom mounted working platform
working platform used for raising or lowering personnel, consisting of a platform fitted onto a (articulated/
telescopic) boom
3.2
upper clamping device
device to hold the drill string closest from the rotary head
1) Currently, under preparation.
2) At the stage of preparation : ISO/DIS 11886:2023

ISO/DIS 20770-2:2025(en)
3.3
specific initial speed
maximum rotation speed allowing a rotation head to stop in less than one revolution under the test
conditions given in ISO 20770-1:____, Annex G
4 Safety requirements and/or protective/risk reduction measures
4.1 General
Drill rigs shall comply with the requirements of ISO 20770-1:____, as far as not modified or replaced by the
requirements of this part.
4.2 Boom mounted working platforms for underground use
ISO 20770-1:____, 4.13.2 does not apply.
When a drill rig for underground use is equipped with a boom mounted working platform intended for use
in an area where there is risk of object fall, the person(s) on the platform shall have adequate protection. A
suitably designed protective structure, FOPS shall be provided over the platform.
Level I of ISO 3449:2008 shall be the minimum requirement (e.g. underground pre-armouring machines).
Level II shall be chosen where there is the risk of rock fall.
NOTE The FOPS can be adjustable taking into account the various functions to be performed from the platform.
Drill rigs equipped with one or more boom mounted platforms shall comply with EN 280-1:2022.
Pre-armouring machines are exempted from the following requirements of EN 280-1:2022:
— a device that prevents driving of the vehicle when the boom mounted platform is not in its transport
position;
— a device that prevents movement of the platform while the stabilizers are not set;
— a device that prevents adjustment of the stabilizers while the boom mounted platform is not in its
transport position;
— a device, located in the operators compartment, that indicates that the boom mounted platform is not in
its transport position;
— a load sensing system;
— an adjustment for uneven ground for base plates on stabilizing jacks.
NOTE The exceptions are justified for the following reasons:
— the primary function of the stabilizers is for use during drilling;
— the need to maneuver in narrow tunnels;
— risk of rock fall;
— size and weight of machine.
Pre-armouring machines are exempted from the requirements of EN 280-1:2022, 4.7.4. The boom mounted
working platform shall be operated from both the platform and the operator's station. Only one control
position shall be active at a time except for stop controls and emergency stop. In case of emergency, e.g. rock
fall, it shall be possible to override the controls of the platform by the control at the operator’s station.
Overturning of pre-armouring machines, due to overload of the platform, of a drill rig for underground use
and equipped with a boom mounted working platform is not considered a significant hazard due to the
size and weight of the rig. However overload of the boom and platform shall be prevented by restricting

ISO/DIS 20770-2:2025(en)
the platform size according to EN 280-1:2022, 4.4.1.6, or by mechanical, hydraulic or electronic protection
systems. The platform shall be subject to a static load test according to EN 280-1:2022, 5.1.4.3.
Any overload prevention system fitted shall not prevent the platform being lowered.
4.3 Requirements for strength and stability
4.3.1 Stability calculation - Tipping angle
ISO 20770-1:____, 4.2.3.5 applies with the following modification(s).
The stability angles α shall not be less than 10° in any directions when tramming and be not less than 5°
under any other conditions.
For rubber-tyred drill rigs for underground use, the stability angle of 10° includes also a margin for the
effects of the dynamic forces from acceleration and braking of the total drill rig.
4.3.2 Operating conditions
4.3.2.1 General
ISO 20770-1:____, 4.2.3.6 applies with the following additions.
The stability of the drill rig shall be calculated for the operating conditions as described in subclauses 4.3.2.2,
4.3.2.3 and 4.3.2.4, which shall be stated in the operator's manual.
4.3.2.2 In service – during operation
The calculation shall be carried out for the most unfavourable combination of conditions that may occur
with the following additional examples:
— booms, service platforms and feed extension in advanced positions and turned to the limit of the working
area. The rated load shall be applied to the service platform;
— steering turned in the extreme and most unfavourable position (articulated carrier);
— mast at the utmost front upward position and maximum forward mast inclination;
— attachments at their highest position;
— maximum pulling force on the rope suspended tool in the bore hole.
4.3.2.3 Tramming
Stability in tramming shall be calculated for the conditions specified in the operator's manual, taking into
account the most unfavourable case.
4.3.2.4 Travelling and operating on slopes
The stability calculations shall be done for the most unfavourable combinations of gradient and load
condition as specified in the operator's manual.
4.4 Fire protection
ISO 20770-1:____, 4.26 applies with the following additions.
For the fire protection of mobile drill rigs intended for use underground, there shall be a fixed on-board,
fire extinguishing system covering the diesel engine compartment and battery installation, e.g. unfused
cables. For remotely controlled, unmanned or partly manned mobile drill rigs, the triggering system shall be
automatic.
ISO/DIS 20770-2:2025(en)
On remotely controlled mobile drill rigs it shall be possible to trigger the fire extinguishing system from the
control panel and/or (if applicable) from the monitoring position.
4.5 Guards and sensitive protective devices
4.5.1 General
ISO 20770-1:____, 4.23.2.2 applies with the modifications in the following requirements.
For drilling machines that do not have significant hazards caused by feed movement of the rotary head, (e.g.
rotary head is higher than 1 600 mm from ground level), requirement specified in 4.5.1 and 4.5.3 shall apply.
4.5.2 Guards
ISO 20770-1:____, 4.23.2.2.2 shall apply with the following additions:
— maximum height of the bottom edge of the guard shall be up to 500 mm from the base of mast foot (L ) or
not more than 120 mm above the lowest position of the upper clamping devices or rod/auger guide (L );
— the upper level of the guard shall prevent unintentional access to the moving parts up to 1 600 mm (H )
from the base of mast foot;
— if the drill rig is intended to operate with the mast in inclined position with respect to the vertical greater
than 15°, as shown in Figure 1, the guard shall extend along the mast up to 1 200 mm above the upper
clamping devices or rod/auger guide (H );
— the guard shall allow manual opening in all positions of the mast or leader, or be motorized.
H ≥ 1 600 mm and H ≥ 1 200 mm
1 2
L ≤ 500 mm or L ≤ 120 mm
1 2
Key
L maximum height of the bottom edge of the guard from the base of mast foot
L maximum height of the bottom edge of the guard above the upper clamping devices or rod/auger guide measured
with the clamping device in its lowest position
H upper level of the guard from the base of mast foot
H extension of the guard above the upper clamping devices or rod/auger guide
NOTE The "grid" area corresponds either to the guard (4.5.2) or to the protective zone (4.5.3)
Figure 1 — Example of guard or protective zone for drill rig in tilted position greater than 15°

ISO/DIS 20770-2:2025(en)
4.5.3 Sensitive protective devices
ISO 20770-1:____, 4.23.2.2.3 shall apply with the following additions:
— maximum height of the bottom edge of the protective zone shall be up to 500 mm from the base of mast
foot (L ) or not more than 120 mm (L ) above the lowest position of the upper clamping devices or rod/
1 2
auger guide;
— the upper level of the protective zone shall prevent unintentional access to the moving parts up to
1 600 mm (H ) from the base of mast foot;
— if the drill rig is intended to operate with the mast in inclined position with respect to the vertical greater
than 15°, as shown in Figure 1, the protective zone shall detect along the mast up to 1 200 mm above the
upper clamping devices or rod/auger guide (H );
— the protective zone shall be effective in all positions of the mast or leader.
4.6 Supplementary trip device
ISO 20770-1:____, 4.23.2.2.6 shall apply with the following additions:
— There shall be at least one supplementary trip device on each side of the drilling axis as shown in
Figures 2a and 2b. Where the structure or parts of equipment prevent access to one side, at least one
single supplementary trip device shall be fitted.
— When the drill rigs is designed for operations that require the mast to be set into a inclined position with
respect to the vertical greater than 15°, supplementary trip devices shall be fitted to cover the whole
stroke of the rotary head. See Figure 2a.
— The location of supplementary trip devices shall be as close as practicable to the maximum drill string
diameter.
a)  Machine designed for multi-directional oper- b)  Machine designed for purely vertical opera-
ation tion (within ±15° from vertical axis)

ISO/DIS 20770-2:2025(en)
NOTE The hatched area corresponds to the supplementary trip device.
Figure 2 — Area for the location of the supplementary trip device
4.7 Protection against moving parts on specific machine types
4.7.1 General
All drill rigs shall comply with ISO 20770-1:____, 4.23 with the following exceptions only:
— underground pre-armouring machine (see 4.7.2)
— suspended drill rigs (see 4.7.3)
4.7.2 Underground pre-armouring machine
ISO 20770-1:____, 4.23.2 does not apply, except 4.23.2.2.3, 4.23.2.2.4 and 4.23.2.2.6.
The installation of the drill string prior to operation is regarded as a rigging operation to be done with the
use of external means such as cranes.
For the rigging operation the restricted operating mode is used as in ISO 20770-1:____, 4.23.2.2.4.
If there is a need of addition and removal of rod during the drilling process it shall be done by a mechanized
rod handling device fitted on the machine.
Machines with a boom mounted platform shall be fitted with a mode selector or an interlocking function to
allow platform operations only when movements of rotation and feed and motions for positioning the drill
string are prevented.
The machine shall be fitted with a remote control system with all controls of hold to run type except feed
and rotation.
NOTE The use of the remote control removes the operator from the danger zone and gives sufficient visibility of
the working process.
The sensitive protective devices as in ISO 20770-1:____, 4.23.2.2.3 should be fitted if the work environment
allows it to be done without creating additional hazards due to their malfunction.
4.7.3 Suspended drill rigs
ISO 20770-1:____, 4.23.2 does not apply, except 4.23.2.2.6.
For these machines, the following shall be complied with:
— rotation controls shall be hold-to-run;
— rotation can operate at normal speed;
— a feed speed of not more than 15 m/min also when releasing accumulated energy;
— an emergency stop (see ISO 20770-1:____, 4.15.4.3) shall be provided at the operating position which can
easily be reach by the operator.
If a supplementary trip device according to ISO 20770-1:____, 4.23.2.2.6 is fitted, no hold-to-run controls for
rotation are required.
NOTE Due to remote area of operation, e.g. alpine conditions, it is not foreseeable to encounter the presence of
any one other than the operator.

ISO/DIS 20770-2:2025(en)
4.8 Rod/auger guide
When the drill string is driven by a universal joint, a rod/auger guide shall be fitted.
4.9 Winches, draw-works and ropes for movement on slopes
ISO 20770-1:____, 4.8 applies with the following additions.
If the drill rig is intended for operation on slopes having a gradient angle higher than 20°, a winch shall be
installed to prevent the drill rig from sliding down the slope. For these winches the following requirements apply.
The relative rated pulling force, f, on the third layer of the rope on the winch drum, shall be chosen in
accordance with the operating gradients stated below:
f > 0,50 for a gradient angle of < 40°
f > 0,40 for a gradient angle of < 35°
f > 0,30 for a gradient angle of < 30°
f > 0,20 for a gradient angle of < 25°
where
Pulling forceinNewton
f =
Massof drillrig×g
Flanges on drums shall be designed to extend at least two rope diameters beyond the outer wrap of rope
in all operating conditions. In specific installations where this is not feasible, other means shall be taken in
order to prevent the rope to be spooled off the drum like mechanical stop or other devices.
Winches for free fall operation shall not be used.
The braking capacity of the winch shall not be less than 1,2 times the pulling force but not exceed 1,6 times
the pulling force.
The wire rope safety factor shall not be less than 3.
The application of a winch shall not be included as a support in the stability calculation.
4.10 Brakes of the carrier machine
4.10.1 General
ISO 20770-1:____, 4.7 applies with the following addition.
For rubber-tyred rigs intended to operate at slope angles steeper than 10°, it shall be possible to slow down,
stop and hold at rest self-propelled rigs so as to ensure safety under all conditions of service, speed, ground
conditions and gradients as specified by the manufacturer.
Braking systems may use common components, however in the case of a failure of any single component
other than a tyre; the braking system shall be capable of bringing the drill rig to a halt in accordance with
the performance requirements specified for the secondary braking system.
It shall not be possible from the operator's position to disconnect the brakes from the wheels or tracks.
Where the operation of the service braking system depends on accumulated hydraulic or pneumatic energy
and in case the power source becomes inoperative, the system shall be capable of sustaining at least five
consecutive applications of the brakes. On the fifth application the brake performance shall not be less than
that specified for the secondary braking system.

ISO/DIS 20770-2:2025(en)
Where braking systems use an energy reservoir, a warning device complying with ISO 3450:2011, 4.9, shall
be provided.
A mobile drill rig, which has any type of remote control for moving, shall be so designed that in case the
driver should lose control for any reason, the machine shall stop automatically.
NOTE For truck, tractor and trailer mounted mobile drill rigs the relevant road traffic regulations regarding the
vehicle brakes apply.
4.10.2 General requirements for wheel mounted mobile drill rigs
Wheel mounted mobile drill rigs shall be equipped with:
— a service braking system;
— a secondary braking system;
— a parking braking system.
The braking system controls shall fulfil the requirements of ISO 3450:2011, 4.3. Pneumatic and hydraulic
braking systems shall be designed as dual circuit systems such that at least two wheels on opposite sides of
the vehicle is braked in the event of a leak. Provisions for examining or testing brake wear and brake fluid
level in any reservoir shall be made.
4.10.3 Service braking system for wheel mounted mobile drill rigs
The service braking system shall give a braking force, in N, equivalent to not less than 35 % of the maximum
drill rig mass multiplied by 9,81. For manoeuvring and holding mobile drill rigs on steep slopes see also
4.8. In addition to this requirement, the service brake system shall be capable ofretarding the drill rig
with at least 1 m/s on the maximum permitted gradient as specified by the manufacturer. For mobile drill
rigs with hydrostatic transmission, service braking action may be performed by means of the hydrostatic
transmission if the performance requirements given above are fulfilled.
The service brake shall be resistant to fade due to heat, see B.3, B.4 and B.5.
4.10.4 Secondary braking system for wheel mounted mobile drill rigs
A secondary braking system shall be provided to stop the drill rig in any condition of service, speed, ground
and gradient as specified by the manufacturer, in the event of any failure in the service braking system.
The secondary braking system shall give a braking force in N, equivalent to not less than 25 % of the
maximum drill rig mass multiplied by 9,81.
In addition to this requirement, the secondary brake system shall be capable of retarding the drill rig with
at least 1 m/s on the maximum permitted gradient as specified by the manufacturer. To achieve this brake
force, the parking brake may be used in addition.
For mobile drill rigs with a hydrostatic service brake, the secondary braking system shall also achieve
independently the braking performance specified in the service brake.
4.10.5 Parking braking system for rubber-tyred rigs
A purely mechanical parking braking system for holding machines in a stationary position shall be provided.
The parking braking system shall be latching.
The parking braking system shall be able to hold the drill rig on the steepest slope it is allowed to operate
on, up to a maximum of 20°, according to the manufacturer's specification with a safety factor of 1,2. For
operating on slopes steeper than 20°, see 4.8.

ISO/DIS 20770-2:2025(en)
4.10.6 Verification of brakes
The brakes of a wheel mounted drill rig shall be tested in accordance with the requirements in Annex B.
The brakes of crawler mounted mobile drill rigs shall be tested in accordance with B.7. The parking brakes
of towed mobile drill rigs shall be tested according to B.7.
NOTE These verifications are not necessary for any machine which is certified to meet the requirements of road
traffic regulations.
4.10.7 Braking systems for skid steer wheel mounted drill rigs
For skid steer chassis, the same rules as for crawler mounted drill rigs of ISO 20770-1:____ shall apply.
Braking action shall be possible on all wheels.
4.11 Noise
ISO 20770-1:____, 4.27.2 applies with the addition of the specific test code specified in Annex A.
4.12 Special protective mode
ISO 20770-1:____, 4.23.2.2.5 applies with the following modifications.
In special protective mode, the release of hold to run control or the activation of supplementary trip device
shall be able to stop the rotating parts in less than one revolution at any initial speed.
In case this requirement is not achievable due to excessive inertia, specific initial speed to achieve this goal
shall be written in the user manual.
The stopping performances shall be verified according to the test code defined in ISO 20770-1:____, Annex G.
5 Verification of the safety requirements and/or protective/risk reduction measures
5.1 General
Safety requirements and/or protective/risk reduction measures of Clauses 4 and 6 of this Document shall be
verified according to Table 2 below. It includes the following types of verification:
a) design check: the result of which being to establish that the design documents comply with the
requirements of this Document;
b) calculation: the results of which being to establish that the requirements of this Document have been met;
c) visual verification: the result of which only being to establish that something is present (e.g. a guard, a
marking, a document);
d) measurement: the result of which shows that the required numerical values have been met (e.g. geometric
dimensions, safety distances, resistance of insulation of the electric circuits, noise, vibrations);
e) functional tests: the result of which shows that the adequate signals intended to be forwarded to the
main control system of the complete machine are available and comply with the requirements and with
the technical documentation;
f) special verification: the procedure being given or in the referred clause.

ISO/DIS 20770-2:2025(en)
Table 1 — Verification of safety requirements and/or protective measures
5 Safety requirements and/or protective measures
4.1 General x  a
4.2 Boom mounted working platforms for under- x  x a
ground use
4.3 Requirements for strength and stability
4.3.1 Stability calculation - Tipping angle x x  a
4.3.2 Operating conditions x x  a
4.3.2.2 In service – during operation x x
4.3.2.3 Tramming x x
4.3.2.4 Travelling and operating on slopes x x
4.4 Fire protection   a
4.5 Guards and sensitive protective devices x x x a
4.6 Supplementary trip device x x a
4.7 Protection against moving parts on specific - - - - - -
machine types
4.7.1 General   a
4.7.2 Underground pre-armouring machine x  x a
4.7.3 Suspended drill rigs x x x
4.8 Rod/auger guide x x
4.9 Winches, draw-works and ropes for movement on x x x x a
slopes
4.10 Brakes of the carrier machine   a
4.10.1 General x  x a
4.10.2 General requirements for wheel mounted mobile x  x a
drill rigs
4.10.3 Service braking system for wheel mounted mo- x x x
bile drill rigs
4.10.4 Secondary braking system for wheel mounted x x x
mobile drill rigs
4.10.5 Parking braking system for rubber-tyred rigs x x x x
4.10.6 Verification of brakes x x
4.10.7 Braking systems for skid steer wheel mounted x  x a
drill rigs
4.11 Noise  x
4.12 Special protective mode x x x
7 Information for use
7.1 General x
7.2 Drill rigs for underground operation x
7.3 Suspended drill rigs x
a
Verification by reference to the standard which is mentioned in the corresponding clause.
5.2 Functional test
ISO 20770-1:____, 5.2.2 applies with the following exemptions.

Clause num-
ber
Title
Design check
Calculation
Visual verifi-
cation
Measurement
F u n c t i o n a l
test
Special veri-
fication
(see the end
of this table)
...