Safety of machinery - Relationship with ISO 12100 - Part 1: How ISO 12100 relates to type-B and type-C standards (ISO/TR 22100-1:2021)

This document provides assistance to the designer/manufacturer of machinery and related components
as to how the system of existing type-A, type-B and type-C machinery safety standards should be
applied in order to design a machine to achieve a level of tolerable risk by adequate risk reduction.
This document explains the general principles of ISO 12100 and how this type-A standard is used for
practical cases in conjunction with type-B and type-C machinery safety standards.
This document provides assistance to standards-writing committees on how ISO 12100 and type-B and
type-C standards relate and explains their function in the risk assessment and risk reduction process
according to ISO 12100.
This document includes an overview of existing categories of type-B standards to assist standards
readers and writers to navigate the many standards.

Sicherheit von Maschinen - Beziehung zu ISO 12100 -Teil 1: Wie ISO 12100 und Typ-B- und Typ-C-Normen zusammenhängen (ISO/TR 22100-1:2021)

Dieses Dokument dient zur Unterstützung von Konstrukteuren/Herstellern von Maschinen und Maschinenkomponenten im Hinblick darauf, wie das System bestehender Typ A , Typ B , und Typ C Normen zur Maschinensicherheit angewendet werden sollte, um bei der Konstruktion einer Maschine ein vertretbares Risikoniveau durch eine hinreichende Risikominderung zu erreichen.
Dieses Dokument erläutert die allgemeinen Grundsätze der ISO 12100 und gibt an, wie diese Typ A Norm in praktischen Fällen in Verbindung mit Typ B  und Typ C Normen zur Maschinensicherheit angewendet wird.
Dieses Dokument dient zur Unterstützung von normenerstellenden Komitees, um den Zusammenhang von ISO 12100 mit Typ B  und Typ C Normen zu verstehen und erläutert deren Funktion beim Prozess der Risikobeurteilung und Risikominderung nach ISO 12100.
Um Normenanwender und -verfasser bei der Orientierung und zielgerichteten Auswahl aus den zahlreichen Normen zu unterstützen, enthält dieses Dokument eine Übersicht über die bestehenden Kategorien von Typ-B-Normen.

Sécurité des machines - Relation avec l'ISO 12100 - Partie 1: Relation entre l'ISO 12100 et les normes de type B et type C (ISO/TR 22100-1:2021)

No scope available

Varnost strojev - Povezava z ISO 12100 - 1. del: Povezava med ISO 12100 in standardi tipov B in C (ISO/TR 22100-1:2021)

General Information

Status
Published
Publication Date
09-May-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Feb-2021
Due Date
26-Apr-2021
Completion Date
10-May-2021

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SLOVENSKI STANDARD
SIST-TP EN ISO/TR 22100-1:2021
01-junij-2021
Nadomešča:
SIST-TP CEN ISO/TR 22100-1:2018
Varnost strojev - Povezava z ISO 12100 - 1. del: Povezava med ISO 12100 in
standardi tipov B in C (ISO/TR 22100-1:2021)

Safety of machinery - Relationship with ISO 12100 - Part 1: How ISO 12100 relates to

type-B and type-C standards (ISO/TR 22100-1:2021)

Sicherheit von Maschinen - Beziehung zu ISO 12100 -Teil 1: Wie ISO 12100 und Typ-B-

und Typ-C-Normen zusammenhängen (ISO/TR 22100-1:2021)

Sécurité des machines - Relation avec l'ISO 12100 - Partie 1: Relation entre l'ISO 12100

et les normes de type B et type C (ISO/TR 22100-1:2021)
Ta slovenski standard je istoveten z: CEN ISO/TR 22100-1:2021
ICS:
13.110 Varnost strojev Safety of machinery
SIST-TP EN ISO/TR 22100-1:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP EN ISO/TR 22100-1:2021
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SIST-TP EN ISO/TR 22100-1:2021
CEN ISO/TR 22100-1
TECHNICAL REPORT
RAPPORT TECHNIQUE
February 2021
TECHNISCHER BERICHT
ICS 13.110 Supersedes CEN ISO/TR 22100-1:2017
English Version
Safety of machinery - Relationship with ISO 12100 - Part 1:
How ISO 12100 relates to type-B and type-C standards
(ISO/TR 22100-1:2021)

Sécurité des machines - Relation avec l'ISO 12100 - Sicherheit von Maschinen - Beziehung zu ISO 12100 -

Partie 1: Relation entre l'ISO 12100 et les normes de Teil 1: Wie ISO 12100 und Typ-B- und Typ-C-Normen

type B et type C (ISO/TR 22100-1:2021) zusammenhängen (ISO/TR 22100-1:2021)

This Technical Report was approved by CEN on 26 January 2021. It has been drawn up by the Technical Committee CEN/TC 114.

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 10 March 2021.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TR 22100-1:2021 E

worldwide for CEN national Members.
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SIST-TP EN ISO/TR 22100-1:2021
CEN ISO/TR 22100-1:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Annex ZA (informative) Relation of this document to the Machinery Directive 2006/42/EC ........... 4

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SIST-TP EN ISO/TR 22100-1:2021
CEN ISO/TR 22100-1:2021 (E)
European foreword

This document (CEN ISO/TR 22100-1:2021) has been prepared by Technical Committee ISO/TC 199

"Safety of machinery" in collaboration with Technical Committee CEN/TC 114 “Safety of machinery” the

secretariat of which is held by DIN.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes CEN ISO/TR 22100-1:2017.

For relation of this document to the Machinery Directive 2006/42/EC see informative Annex ZA.

Endorsement notice

The text of ISO/TR 22100-1:2021 has been approved by CEN as CEN ISO/TR 22100-1:2021 without any

modification.
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SIST-TP EN ISO/TR 22100-1:2021
CEN ISO/TR 22100-1:2021 (E)
Annex ZA
(informative)
Relation of this document to the Machinery Directive 2006/42/EC
ZA.1 General

CEN ISO/TR 22100-1 (identical to ISO/TR 22100-1) provides a transparent guideline how to choose the

appropriate machinery safety standard(s) representing the state of the art and to apply it/them

correctly in order to achieve at a given time a level of tolerable risk by adequate risk reduction for an

actual machine. In this document, the term tolerable risk should be read as residual risk as defined in

ISO 12100-to be compliant with European Union (EU) legislation.

NOTE While the residual risk is defined as the risk remaining after risk reduction measures have been

implemented (see ISO/IEC Guide 51:2014, 3.8), tolerable risk is the level of risk that is accepted in a given context

based on the current values of society (see 3.2). It is generally accepted that the residual risk is equal or lower

than the tolerable risk.

Compared to the international level (where no common legal framework for machinery safety exists) at

the European Union (EU) machinery safety standards are developed by CEN and CENELEC within the

legal framework of the New Approach (New Legislative Framework) to provide presumption of

conformity with relevant Essential Requirements of the EU Machinery Directive 2006/42/EC .

Those standards are harmonized and provide presumption of conformity to 2006/42/EC when cited in

the Official Journal of the EU .
ZA.2 Special relevance of this document for harmonized standards (type-C)
providing presumption of conformity

The methodology as specified in Clause 6 of this document provides detailed guidance for the machine

manufacturer how to choose and evaluate harmonised standards (type-C) in order to achieve

presumption of conformity with Essential Requirements of 2006/42/EC for his actual machine in

accordance with the following statement given in §111 of the Guide to the application of the Machinery

Directive 2006/42/EC:

"Application of the specifications of a C-type standard confers a presumption of conformity with the

essential health and safety requirements of the Machinery Directive covered by the standard provided

the manufacturer has determined in his risk assessment that the scope and the significant hazards

covered by the standard correspond with his actual machinery. Further practical guidance is provided

by ISO/TR 22100-1."

Further information to the New Approach (New Legislative Framework) are provided in the Blue Guide:

https://ec.europa.eu/docsroom/documents/38022
https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32006L0042

Example for a citation of Harmonized Standards to 2006/42/EC see: https://eur-lex.europa.eu/legal-

content/EN/TXT/?uri=uriserv:OJ.L_.2019.075.01.0108.01.ENG&toc=OJ:L:2019:075:TOC
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SIST-TP EN ISO/TR 22100-1:2021
TECHNICAL ISO/TR
REPORT 22100-1
Second edition
2021-01
Safety of machinery — Relationship
with ISO 12100 —
Part 1:
How ISO 12100 relates to type-B and
type-C standards
Sécurité des machines — Relation avec l'ISO 12100 —
Partie 1: Relation entre l'ISO 12100 et les normes de type B et type C
Reference number
ISO/TR 22100-1:2021(E)
ISO 2021
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SIST-TP EN ISO/TR 22100-1:2021
ISO/TR 22100-1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
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ISO/TR 22100-1:2021(E)
Contents Page

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

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General structure of the system of machinery safety standards ........................................................................ 2

5 System of type-A, type-B and type-C standards .................................................................................................................... 2

5.1 Type-A standard (ISO 12100) .................................................................................................................................................... 2

5.2 Type-B standards .................................................................................................................................................................................. 6

5.2.1 General...................................................................................................................................................................................... 6

5.2.2 Type-B1 standards ......................................................................................................................................................... 6

5.2.3 Type-B2 standards ......................................................................................................................................................... 6

5.3 Type-C standards .................................................................................................................................................................................. 6

5.3.1 General...................................................................................................................................................................................... 6

5.3.2 Content provided by type-C standards ......................................................................................................... 7

5.3.3 Deviations in a type-C standard from a type-B standard .............................................................. 7

6 Practical application of ISO 12100, type-B and type-C standards in order to design a

machine to achieve a level of tolerable risk by adequate risk reduction ..................................................7

6.1 General ........................................................................................................................................................................................................... 7

6.2 Application of an appropriate type-C standard .......................................................................................................... 8

6.2.1 General...................................................................................................................................................................................... 8

6.2.2 Steps to be followed ...................................................................................................................................................... 9

7 Navigating appropriate type-B machinery safety standards ..............................................................................10

Annex A (informative) Iterative process of risk assessment and risk reduction ................................................12

Annex B (informative) Types of ISO documents ....................................................................................................................................13

Bibliography .............................................................................................................................................................................................................................14

© ISO 2021 – All rights reserved iii
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ISO/TR 22100-1:2021(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/d irectives).

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/p atents).

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/i so/f oreword. html.

This document was prepared by Technical Committee ISO/TC 199, Safety of machinery.

This second edition cancels and replaces the first edition (ISO/TR 22100-1:2015), which has been

technically revised.
The main changes compared to the previous edition are as follows.

— the wording "…, hazardous situation(s) or hazardous event(s)" has been deleted from 5.3.2 (NOTE

and last paragraph) and 6.2.2 (subheading "Step 4B"and the following two paragraphs as well as

Step 4C, fifth paragraph), eight times, in total;

— in 6.2.1, second paragraph, second sentence "this part of ISO 22100" has been corrected to "that

type-C standard";

— the sentence given in 6.2.2, Step 4C, as paragraph below the Note has also been inserted as new

penultimate paragraph to Step 4B.
A list of all parts in the ISO/TR 22100 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 2021 – All rights reserved
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Introduction

This document is written to assist the designer/manufacturer of machinery and related components

in understanding and navigating the different types of ISO machinery safety standards. It presents

the different ISO deliverables (see Annex B) and explains the type-A, type-B and type-C structure of

machinery safety standards and their interrelationship with regard to the practical design of machinery

subjected to adequate risk reduction to achieve tolerable risk.

This document can be helpful for standard writing committees (type-B and type-C), too. However, it

does not provide specification of the general content that is expected to be included in the different

types of machinery safety standards. This specification is given in ISO Guide 78.

This document includes a visual representation of many ISO machinery safety standards to assist in

improving understanding of the interrelationships and linkages between these documents.

© ISO 2021 – All rights reserved v
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SIST-TP EN ISO/TR 22100-1:2021
TECHNICAL REPORT ISO/TR 22100-1:2021(E)
Safety of machinery — Relationship with ISO 12100 —
Part 1:
How ISO 12100 relates to type-B and type-C standards
1 Scope

This document provides assistance to the designer/manufacturer of machinery and related components

as to how the system of existing type-A, type-B and type-C machinery safety standards should be

applied in order to design a machine to achieve a level of tolerable risk by adequate risk reduction.

This document explains the general principles of ISO 12100 and how this type-A standard is used for

practical cases in conjunction with type-B and type-C machinery safety standards.

This document provides assistance to standards-writing committees on how ISO 12100 and type-B and

type-C standards relate and explains their function in the risk assessment and risk reduction process

according to ISO 12100.

This document includes an overview of existing categories of type-B standards to assist standards

readers and writers to navigate the many standards.
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 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12100 and the following 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/
3.1
adequate risk reduction

risk reduction that is at least in accordance with legal requirements, taking into consideration the

current state of the art
[SOURCE: ISO 12100:2010, 3.18, modified — Note 1 to entry has been removed.]
3.2
tolerable risk

level of risk that is accepted in a given context based on the current values of society

Note 1 to entry: The terms “acceptable risk” and “tolerable risk” are considered to be synonymous.

[SOURCE: ISO/IEC Guide 51:2014, 3.15, modified — In Note 1 to entry, the words “For the purpose of

this Guide” have been deleted.]
© ISO 2021 – All rights reserved 1
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ISO/TR 22100-1:2021(E)
4 General structure of the system of machinery safety standards
Standards on safety of machinery have the following structure:

— type-A standards (basic safety standards) giving basic concepts, principles for design, and general

aspects that can be applied to machinery;

— type-B standards (generic safety standards) dealing with one safety aspect or one type of safeguard

that can be used across a wide range of machinery;

— type-C standards (machine safety standards) dealing with detailed safety requirements for a

particular machine or group of machines.

As shown in Figure 1, ISO 12100 is the type-A standard specifying the general principles for safety of

machinery and applies to all machinery.
Figure 1 — General structure of the system of machinery safety standards
5 System of type-A, type-B and type-C standards
5.1 Type-A standard (ISO 12100)

ISO 12100 specifies the principle strategy for safety of machinery. Risk assessment and adequate

risk reduction by an iterative three-step method are the imperative measures to design a machine to

achieve a level of tolerable risk.

To implement risk assessment and risk reduction, the following actions should be taken by the designer

in the order given (see Figure 2):

a) determine the limits of the machinery, which includes the intended use and any reasonably

foreseeable misuse thereof;
b) identify the hazards and associated hazardous situations;
c) estimate the risk for each identified hazard and hazardous situation;
d) evaluate the risk and decision whether a risk reduction is needed or not;

e) eliminate the hazard or reduction of the risk associated with the hazard by means of protective

measures/risk reduction measures.

NOTE 1 For the purposes of this document, the terms “protective measure” (see ISO 12100:2010, 3.19) and

“risk reduction measure” are synonymous and referred to any action or means used to eliminate hazards and/or

reduce risks.
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SIST-TP EN ISO/TR 22100-1:2021
ISO/TR 22100-1:2021(E)
Actions a) to d) are related to risk assessment and action e) to risk reduction.

Risk assessment is a series of logical steps to enable, in a systematic way, the identification of hazards

as well as the estimation and evaluation of the risks associated with machinery.

As a result of the risk assessment, the hazards requiring risk reduction are determined. Iteration of the

process of risk assessment can be necessary to eliminate newly generated hazards as far as reasonably

practicable or to adequately reduce associated risks by the implementation of protective measures/risk

reduction measures in order to achieve tolerable risk.

Protective measures/risk reduction measures are the combination of the measures implemented by the

designer and the user in accordance with Figure 3. Measures which can be incorporated at the design

stage are preferable to those implemented by the user and usually prove more effective.

The objective to be met is the greatest practicable risk reduction. The strategy defined in this clause

is represented by the flowchart in Figure 2. The process itself is iterative and several successive

applications can be necessary to reduce the risk, making the best use of available technology. In

carrying out this process, it is necessary to take into account these four factors, in the following order

of preference:
— the safety of the machine during all the phases of its life cycle;
— the ability of the machine to perform its function;
— the usability of the machine;
— the manufacturing, operational and dismantling costs of the machine.

NOTE 2 The ideal application of these principles requires knowledge of the machine design and its intended

use, the practical use of the machine, the accident history and health records, available risk reduction techniques,

and the legal framework in which the machine is intended to be used (placed on the market).

© ISO 2021 – All rights reserved 3
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ISO/TR 22100-1:2021(E)

The first time the question is asked, it is answered by the result of the initial risk assessment. For further

information, see Annex A.

Figure 2 — Schematic representation of risk assessment and risk reduction process including

iterative three-step method according to ISO 12100:2010, Figure 1
4 © ISO 2021 – All rights reserved
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ISO/TR 22100-1:2021(E)
Key

Providing proper information for use is part of the designer’s contribution to risk reduction, but the protective

measures concerned are only effective when implemented by the user.

The user input is that information received by the designer from either the user community regarding the

intended use of the machine in general or that which is received from a specific user.

There is no hierarchy between the various protective measures implemented by the user. These protective

measures are outside the scope of this document.

Those protective measures required due to specific process(es) not envisaged in the intended use of the

machine or to specific conditions for installation that cannot be controlled by the designer.

Figure 3 — Risk reduction process from the point of view of the designer (see also

© ISO 2021 – All rights reserved 5
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ISO/TR 22100-1:2021(E)
ISO 12100:2010, Figure 2)
5.2 Type-B standards
5.2.1 General

According to ISO 12100, type-B standards deal either with one safety aspect (type-B1 standard) or

one type of safeguard that can be used across a wide range of machinery (type-B2 standard). Type-B

standards are intended to support the principle strategy from ISO 12100 in order to:

— help determine if a hazard exists, for example, ISO 13857; and

— provide concrete information/measures to perform risk reduction, for example, ISO 14120.

5.2.2 Type-B1 standards

Type-B1 standards deal with particular safety aspects (for example, safety distances, surface

temperature, noise) and define by data and/or methodology how these can be addressed. Type-B1

standards can be used directly by the designer/manufacturer or by reference in (a) type C standard(s),

including, where relevant, means of verification.
5.2.3 Type-B2 standards

Type-B2 standards provide the performance requirements for the design and construction of particular

safeguards (for example, two-hand control devices, interlocking devices, pressure-sensitive protective

devices, guards). Type-B2 standards can be applied either directly by the designer/manufacturer or by

reference in (a) type-C standard(s). Together with those performance requirements, type-B2 standards

specify, where relevant, means of verification.
5.3 Type-C standards
5.3.1 General

According to ISO 12100, type-C standards provide detailed safety requirements for particular

machinery or group of machinery.

NOTE The term “group of machinery” means machinery having a similar intended use and similar hazards,

hazardous situations, or hazardous events.

Type-C standards are machine specific. Their scope is determining the limits of the machinery and the

significant hazards covered.

Type-C standards are written by a team of technical experts (in particular, from machine manufacturers

and representatives from health and safety bodies) knowledgeable in the machine design (intended

use), the practical use of the machine, the accident history and health records, available risk reduction

techniques, and the legal frameworks in which the machine is intended to be used (placed on the

market).

Type-C standards deal with all the significant hazards of a particular machine by:

— referencing relevant and applicable type-B standards;

— referencing other standards (e.g. a type-C standard), where such significant hazards are adequately

dealt with;

— specifying safety requirements in the standard, when reference to other standards is not possible

or not sufficient and where risk assessment and priorities show this is required; and

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ISO/TR 22100-1:2021(E)

— dealing as far as possible with objectives rather than design prescriptive details to minimize

restrictions on design.
5.3.2 Content provided by type-C standards
Type-C standards clearly establish the following:
— the scope (limits of the machinery);
— the significant hazard(s);

— the requirements prescribing protective measures/risk reduction measures which add value to

relevant clauses of ISO 12100 originating from the significant hazard(s);
— the means of verifying the protective measures/risk reduction measures.

NOTE Where possible, a type-C standard deals with all significant hazards identified as arising from the

use of the machine. The justifiable exception to this comprehensive treatment of significant hazards is where a

type-C standard deals with one or more hazard(s) that are sufficiently important to require special treatment.

Where a type-C standard deals with specific hazard(s), this is indicated clearly in the title and scope (e.g. Safety

of textile machines — Measurement of noise). Where it is decided not to deal with all significant hazards (e.g. by

lack of knowledge or because this causes an unacceptable delay in the drafting of the standard), this is indicated

clearly in the scope.

It is a basic principle that type-C standards contain sufficient added value to the requirements of

existing type-A and type-B standards. Added value normally consists of a description of specific

protective measure(s)/risk reduction measure(s) dealing with the significant hazard. However, this can

also include reference to type-B standards or to other reference standards.
5.3.3 Deviations in a type-C standard from a type-B standard
Because of
...

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