SIST EN ISO 8847:2021

SLOVENSKI STANDARD
SIST EN ISO 8847:2021
01-oktober-2021
Nadomešča:
SIST EN ISO 8847:2017
Mala plovila - Krmilni mehanizem - Sistemi s kabli preko škripčevja (ISO
8847:2021)
Small craft - Steering gear - Cable over pulley systems (ISO 8847:2021)
Kleine Wasserfahrzeuge - Steuerungssystem - Kabel- und Seilzugsteuerung (ISO
8847:2021)
Petits navires - Appareils à gouverner - Systèmes à drosses et réas (ISO 8847:2021)
Ta slovenski standard je istoveten z: EN ISO 8847:2021
ICS:
47.020.70 Navigacijska in krmilna Navigation and control
oprema equipment
47.080 Čolni Small craft
SIST EN ISO 8847:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8847:2021

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SIST EN ISO 8847:2021


EN ISO 8847
EUROPEAN STANDARD

NORME EUROPÉENNE

July 2021
EUROPÄISCHE NORM
ICS 47.080 Supersedes EN ISO 8847:2017
English Version

Small craft - Steering gear - Cable over pulley systems (ISO
8847:2021)
Petits navires - Appareils à gouverner - Systèmes à Kleine Wasserfahrzeuge - Steuerungssystem - Kabel-
câble sur poulie (ISO 8847:2021) und Seilzugsteuerung (ISO 8847:2021)
This European Standard was approved by CEN on 5 March 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

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 NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

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. EN ISO 8847:2021 E
worldwide for CEN national Members.

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SIST EN ISO 8847:2021
EN ISO 8847:2021 (E)
Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2013/53/EU aimed to be covered . 4

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SIST EN ISO 8847:2021
EN ISO 8847:2021 (E)
European foreword
This document (EN ISO 8847:2021) has been prepared by Technical Committee ISO/TC 188 "Small
craft" in collaboration with Technical Committee CEN/TC 464 “Small Craft” the secretariat of which is
held by SIS.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2022, and conflicting national standards shall
be withdrawn at the latest by January 2022.
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 EN ISO 8847:2017.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For the relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral
part of this document.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN websites.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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 the
United Kingdom.
Endorsement notice
The text of ISO 8847:2021 has been approved by CEN as EN ISO 8847:2021 without any modification.

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SIST EN ISO 8847:2021
EN ISO 8847:2021 (E)
Annex ZA
(informative)

Relationship between this European Standard and the essential
requirements of Directive 2013/53/EU aimed to be covered
This European Standard has been prepared under a Commission’s standardization request
M/542/C(2015) 8736 final to provide one voluntary means of conforming to essential requirements of
Directive 2013/53/EU.
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and
Annex I of Directive 2013/53/EU
Essential Requirements of Clause(s)/sub-clause(s) Remarks/Notes
Directive 2013/53/EU of this EN
Annex I, Clause 5.4.1, Steering 4, 5, 6, 7 and 9 This standard specifies
system, general. requirements for cable over
pulley steering systems only
from the helm to the connection
to the rudder or outboard engine.
This Standard does not address
an emergency means of steering.
This standard does not address
propulsion control systems.
Annex I, Clause 2.5, Owner’s 8 In respect of information for
Manual cable over pulley steering
systems only.
Annex II, Components of 4, 5, 6, 7 and 9 In respect of cable over pulley
watercraft (3) Steering wheels, steering systems and their major
steering mechanisms and cable components only.
assemblies.
Steering wheels supplied as
components are excluded from
this standard.
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.

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SIST EN ISO 8847:2021
INTERNATIONAL ISO
STANDARD 8847
Third edition
2021-06
Small craft — Steering gear — Cable
over pulley systems
Petits navires — Appareils à gouverner — Systèmes à câble sur poulie
Reference number
ISO 8847:2021(E)
©
ISO 2021

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SIST EN ISO 8847:2021
ISO 8847:2021(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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SIST EN ISO 8847:2021
ISO 8847:2021(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General requirements . 4
5 Steering system requirements . 5
6 Installation . 9
7 Testing requirements .13
8 Owner’s manual.17
9 Instruction manual .17
Annex A (informative) Steering wheel and helm shaft fit .18
Annex B (informative) Recommended procedures for conducting cable over pulley strength
tests as required in 7.2.2 for outboard engine applications — Tangential load test .20
Bibliography .23
© ISO 2021 – All rights reserved iii

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SIST EN ISO 8847:2021
ISO 8847:2021(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/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 188, Small craft, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 464, Small craft, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 8847:2004), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— update of the scope to clarify application on small craft with and without propulsion engine(s);
— addition to the scope of small craft with outboard engines up to and including 37 kW total power;
— update of the definitions;
— update of requirements to meet state of the art;
— addition of informative Annexes A and B.
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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SIST EN ISO 8847:2021
INTERNATIONAL STANDARD ISO 8847:2021(E)
Small craft — Steering gear — Cable over pulley systems
1 Scope
This document specifies the requirements for the design, installation and testing of cable over pulley
steering systems on small craft with or without a propulsion engine(s), and on small craft with outboard
engine(s) up to and including 37 kW total power.
It specifies the requirements for the design and testing of all components of a cable over pulley steering
system, from the steering mechanism to the mechanical interface with the rudder shaft or the outboard
engine. It applies to cable over pulley steering systems, whether for pedestal or bulkhead types.
This document does not address emergency means of steering the craft.
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 2408:2017, Steel wire ropes — Requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
accessible
capable of being reached for operation, inspection or maintenance without removal of permanent
structure of the craft
3.2
cable
flexible mechanical means of transmitting tension forces from one location to another
Note 1 to entry: This cable can be metallic or non-metallic.
3.3
cable drum
circular feature of the steering mechanism (3.10) over which the steering cable (3.2) is routed to provide
the required cable travel
3.4
cable over pulley steering system
steering system in which rotation of the steering wheel transmits movement to either the steering arm
quadrant fastened to the rudder shaft, or to the outboard engine steering arm, by mechanical means
including flexible cable over pulleys mounted to the structure of the craft
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SIST EN ISO 8847:2021
ISO 8847:2021(E)

3.5
cable load
force applied to the cable (3.2) providing the necessary torque to move either the rudder through the
rudder shaft/steering arm or the outboard engine while the craft is underway
3.6
cable-in conduit-steering system
steering system in which rotation of the steering wheel transmits movement to either the steering arm
quadrant fastened to the rudder shaft, or to the outboard engine steering arm, by mechanical means
including flexible cable (3.2) and conduits with or without use of pulleys
3.7
fairlead
ring, eye or loop that guides a cable (3.2) in the desired direction
Note 1 to entry: A pulley can also perform the function of a fairlead.
3.8
swivel pulley
pulley whose attachment feature is designed to allow the pulley to rotate freely about the swivel
centreline
Note 1 to entry: See Figure 1, left side.
3.9
fixed strap pulley
pulley whose attachment is designed for minimum, if any, rotation of the pulley assembly about the
fixed strap axis
Note 1 to entry: See Figure 1, right side.
Dimensions in millimetres
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SIST EN ISO 8847:2021
ISO 8847:2021(E)

Key
1 swivel
2 cheek strap
3 fixed strap
4 sheave
5 pulley pin
Figure 1 — Swivel and fixed strap pulleys cable over pulley systems
3.10
steering mechanism
device to which a control element (3.20) is attached for manual application of a controlling force, and by
which the controlling force is fed into a steering system (3.14)
3.11
helm station
location from which steering, propulsion and thrust can be controlled
3.12
minimum retained system performance
system capability after test(s) such that at least 90 % of the outboard engine steering arm travel
normally available each side of the mid-position can be attained by exertion of no more than 27 Nm of
torque at the helm through the steering mechanism (3.10), through the control element (3.20)
Note 1 to entry: These limits are not intended to define a condition under which a craft can or cannot be safely
operated but are intended to provide quantitative limits for design and testing purposes.
3.13
steering arm
component fixed to the rudder shaft with at least one groove for the cable (3.2) concentric to the shaft
centre or for outboard engines, the portion of the outboard engine that the steering system makes
mechanical interface (3.21) with
Note 1 to entry: The steering arm can be a wheel quadrant (see Figure 2a), a quadrant (see Figure 2b) or a tiller
quadrant (see Figure 2c).
a) Wheel quadrant b) Quadrant c) Tiller quadrant
Figure 2 — Examples of steering arm types
3.14
steering system
assembly including all components necessary to transmit remote manual effort to the rudder blade
steering arm quadrant or to the outboard engine steering arm
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SIST EN ISO 8847:2021
ISO 8847:2021(E)

3.15
total steering loss
complete loss of the ability to steer the craft from the helm station (3.11) by application of manual effort
to the control element (3.20)
3.16
steering wheel
mechanical means for applying manual steering effort to the helm, normally a circular configuration
with a continuous loop at the distal end of support spokes with the steering mechanism (3.10) connected
at the rotational axis
3.17
steering wheel diameter
actual diameter
D
a
diameter of the circle formed by the outermost sections of the steering wheel (3.16)
Note 1 to entry: See Figure 3.
3.18
steering wheel dish
distance between the two parallel planes formed by the aft rim surface and the forward hub surface of
a steering wheel (3.16)
Note 1 to entry: see Figure 3.
3.19
craft
small craft
recreational boat, and other watercraft using similar equipment, of up to 24 m length of hull (L )
H
Note 1 to entry: The measurement methodology for the length of hull is defined in ISO 8666.
[SOURCE: ISO 8666:2020, 3.15, modified – Note 1 to entry has been added.]
3.20
control element
device connected to the steering mechanism (3.10) that allows the operator to apply manual steering
effort to the steering system (3.14)
3.21
mechanical interface
interface where force and motion are transmitted mechanically
3.22
sailing boat
craft (3.19) for which the primary means of propulsion is by wind power, having reference sail area
2/3
(A ) ≥ 0,07 (m )
S LDC
[SOURCE: ISO 8666:2020, 3.11]
4 General requirements
4.1 Components of the steering system shall be fastened securely to the structure of the craft,
reinforced where necessary, especially at the steering mechanism bulkhead/pedestal mounting and at
pulleys.
4.2 On a sailing boat, the steering arm connection to the rudder shaft shall be capable of transmitting
the required steering torque to the rudder.
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SIST EN ISO 8847:2021
ISO 8847:2021(E)

NOTE Rudder requirements are addressed in ISO 12215-8.
4.3 Cable over pulley steering systems designed to meet the requirements of this document shall not
be used to steer craft having outboard engine(s) in excess of 37 kW total power.
4.4 All threaded fasteners whose integrity affects safe operation of the steering system so that
separation or loss of the fasteners can cause total steering loss without warning shall be provided with a
locking means.
4.4.1 Threaded fasteners that can be expected to be disturbed by installation or adjustment procedures
s
...