FprEN ISO 8847

Small craft - Steering gear - Cable over pulley systems (ISO/DIS 8847:2019)

Kleine Wasserfahrzeuge - Steuerungssystem - Kabel- und Seilzugsteuerung (ISO/FDIS 8847:2020)

Dieses Dokument legt die Anforderungen an Entwurf, Einbau und Prüfungen von Seilzug-Steueranlagen auf kleinen Wasserfahrzeugen mit oder ohne Antriebsmotor(en) und auf kleinen Wasserfahrzeugen mit Außenbordmotor(en) bis einschließlich 37 kW Gesamtleistung fest.
Es legt die Anforderungen an Entwurf und Prüfung aller Bauteile einer Seilzug-Steueranlage von der Lenkvorrichtung bis zur mechanischen Verbindung mit dem Ruderschaft oder dem Außenbordmotor fest. Es gilt für Seilzug-Steueranlagen, die sowohl an einer Steuersäule als auch am Schott montiert sein können.
Dieses Dokument behandelt keine Mittel zur Steuerung des Wasserfahrzeugs im Notfall (Notsteuerung).

Petits navires - Appareils à gouverner - Systèmes à drosses et réas (ISO/DIS 8847:2019)

Mala plovila - Krmilni mehanizem - Sistemi s kabli preko škripčevja (ISO/DIS 8847:2019)

General Information

• Status: Not Published
• ICS: 47.080 - Small craft
• Technical Committee: CEN/TC 464 - Small Craft
• Current Stage: 6055 - CEN Ratification completed (DOR) - Publishing
• Due Date: 05-Mar-2021
• Completion Date: 05-Mar-2021
• Directive: 2013/53/EU - Directive 2013/53/EU of the European Parliament and of the Council of 20 November 2013 on recreational craft and personal watercraft and repealing Directive 94/25/EC
• Mandate: M/542 - [C(2015)8736] Standardisation Request to the European Committee for Standardisation and the European Committee for Electro-technical Standardisation as regards recreational craft and personal watercraft in support of Directive 2013/53/EU of the European Parliament and of the Council of 20 November 2013 on recreational craft and personal watercraft and repealing Directive 94/25/EC.
• Ref Project: kSIST FprEN ISO 8847:2020 - Small craft - Steering gear - Cable over pulley systems (ISO/DIS 8847:2019)

RELATIONS

• Revised: EN ISO 8847:2017 - Small craft - Steering gear - Cable and pulley systems (ISO 8847:2004)
• Effective Date: 16-May-2018

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 8847:2020
01-februar-2020
Mala plovila - Krmilni mehanizem - Sistemi s kabli preko škripčevja (ISO/DIS
8847:2019)
Small craft - Steering gear - Cable over pulley systems (ISO/DIS 8847:2019)
Kleine Wasserfahrzeuge - Steuerungssystem - Kabel- und Seilzugsteuerung (ISO/DIS
8847:2019)
Petits navires - Appareils à gouverner - Systèmes à drosses et réas (ISO/DIS
8847:2019)
Ta slovenski standard je istoveten z: prEN ISO 8847
ICS:
47.020.70 Navigacijska in krmilna Navigation and control
oprema equipment
47.080 Čolni Small craft
oSIST prEN ISO 8847:2020 en,fr,de

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

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oSIST prEN ISO 8847:2020
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oSIST prEN ISO 8847:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 8847
ISO/TC 188 Secretariat: SIS
Voting begins on: Voting terminates on:
2019-12-06 2020-02-28
Small craft — Steering gear — Cable over pulley systems
Petits navires — Appareils à gouverner — Systèmes à drosses et réas
ICS: 47.080
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 8847:2019(E)
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. ISO 2019
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oSIST prEN ISO 8847:2020
ISO/DIS 8847:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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oSIST prEN ISO 8847:2020
ISO/DIS 8847:2019(E)
Contents Page

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

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

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

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

4 General Requirements .................................................................................................................................................................................... 4

5 Construction requirements ....................................................................................................................................................................... 4

6 Installation ................................................................................................................................................................................................................. 8

7 Testing Requirements ..................................................................................................................................................................................14

8 Owner’s manual..................................................................................................................................................................................................17

9 Instruction manual .........................................................................................................................................................................................17

Annex A (informative) Recommended procedures for conducting cable over pulley strength

tests required in Section 7.1 for outboard engine applications .......................................................................19

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2013/53/EU aimed to be covered ............................................................................22

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oSIST prEN ISO 8847:2020
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Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 188 Small craft.

This fourth edition cancels and replaces the third edition (ISO 8847:2017), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— Update of the definitions;
— Update of requirements to meet current industry practice;

— Addition of powered craft with outboard engines up to and including 37 kW total horsepower.

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 2019 – All rights reserved
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oSIST prEN ISO 8847:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 8847:2019(E)
Small craft — Steering gear — Cable over pulley systems
1 Scope

This document specifies the requirements for the design, construction, installation and testing of cable

over pulley steering systems on sailing craft of hull lengths up to 24 m with or without an auxiliary

engine and powered craft of hull lengths up to 24 m with outboard engines up to and including 37 kW

total horsepower.

This document specifies the requirements for the design and construction of all components of a

steering system from the helm to rudder connection point or connection to 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:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
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 could be metallic or non-metallic
3.3
cable drum

circular feature of the steering helm over which the steering cable is routed to provide the required

cable travel
3.4
cable over pulley steering system

asteering system in which rotation of the steering wheel transmits movement of the rudder blade

steering arm quadrant fastened to the rudder shaft or outboard steering arm by mechanical means

including flexible cable over pulleys mounted to the structure of the craft
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oSIST prEN ISO 8847:2020
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3.5
cable load

Force applied to the cable providing the necessary torque to move the rudder through the rudder shaft/

steering arm or outboard engine while the craft is underway
3.6
cable in conduit steering systems

steering system in which rotation of the steering wheel transmits movement of the rudder blade

steering arm quadrant fastened to the rudder shaft or outboard steering arm by mechanical means

including flexible cable and conduits with or without use of pulleys
3.7
fairlead

ring, eye or loop that guides a cable in the desired direction. A pulley may 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. See Figure 1
3.9
fixed strap pulley

pulley whose attachment is designed for minimum if any rotation of the pulley assembly about the fixed

strap axis. See Figure 1
Key
1 swivel
2 cheek strap
3 fixed strap
4 sheave
Figure 1 — Pulleys for outboard cable over pulley systems
3.10
steering helm
operator input device for the control of steering
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oSIST prEN ISO 8847:2020
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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 rudder blade steering arm quadrant or

outboard engine steering arm travel normally available each side of the mid-position may be attained

by exertion of no more than 27 Nm of torque at the helm through the steering wheel.

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 armcomponent fixed to the rudder shaft with at least one groove for the cable concentric

to the shaft centre.

Note 1 to entry: The steering arm may 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 outboard engine steering arm
3.15
total steering loss

complete loss of the ability to steer the craft from the helm position by application of manual effort to

the steering wheel
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 helm connected at the rotational axis

3.17
steering wheel diameter

the diameter of the circle formed by the outermost sections of the steering wheel, See Figure 3

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oSIST prEN ISO 8847:2020
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3.18
steering wheel dish

the distance between the two parallel planes formed by the aft rim surface and the forward hub surface

of a steering wheel, see Figure 3
3.19
craft
small craft

recreational craft, and other watercraft using similar equipment, of up to 24 m length of hull (L )

4 General Requirements

4.1 To ensure the proper operation of a steering system, all components shall be fastened securely to

the structure of the craft, reinforced where necessary, especially at the helm bulkhead/pedestal mounting

and at pulleys.

4.2 The steering arm connection to the rudder shaft shall also be capable of transmitting the required

steering torque to the rudder.

4.3 Cable over pulley steering systems designed to meet the requirements of this standard shall not be

used to steer craft having engine(s) in excess of 37 kW total power.

4.4 All threaded fasteners whose integrity affects safe operation of the steering system such that

separation or loss of the fasteners may cause sudden loss of steering without warning shall be provided

with a locking means.

4.4.1 Threaded fasteners that may be expected to be disturbed by installation or adjustment

procedures, shall be referenced by instructions for correct assembly and –

4.4.2 Shall be locked by a device whose presence is determined by visual inspection or by feel following

assembly, or

4.4.3 Shall incorporate an integral locking means, provided the fastener cannot be omitted or

substituted without making the steering system inoperable.

NOTE Self-locking nuts with plastic inserts that create mechanical plastic interference meet the above

stated requirements.

4.4.4 Loose lock washers, distorted thread nuts or separately applied adhesives are prohibited.

4.4.5 Plain threaded jam nuts may be used to permit adjustments and shall be designed so that total

separation of parts or other complete loss of steering will not occur should they loosen.

5 Construction requirements

5.1 Steering stops for the outboard engine shall permit at least 30° of angular movement either side of

centre. Stops for the rudder blade steering arm quadrant shall be set by the hull design engineer.

5.2 When used with an outboard engine, the cable over pulley steering system attachment to the

engine shall be designed so that with any combination of engine turn and tilt, there will be no damaging

interference between the engine, its accessories, the steering system and the craft.

5.3 Installation instructions for the steering helm shall include recommendations for the maximum

diameter and deepest dish wheel that can be used with the helm. In addition, the maximum diameter and

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deepest dish wheel information shall be permanently marked so as to be visible with the helm installed

and the wheel removed. See Figure 3
Key
1 dish
2 diameter
3 actual diameter
4 wheel level line
Figure 3 — Steering wheel terms

5.3.1 When equipped with the largest diameter and deepest dish steering wheel for which the helm is

rated, all steering components shall be of sufficient strength to successfully pass the Testing Requirements

of Section 7.

5.4 The radius of the steering arm and cable diameter shall be chosen such that the cable load is less

than 25 % of the cable breaking strength. The steering arm radius shall be concentric with the rudder

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shaft centre. The radius at the end of the groove where the cable is led out shall be at least 5 times the

diameter of the cable used. See Figure 4.
Key
1 end grove
2 Rad a, ≥ 5 x cable diameter
3 steering arm radius
Figure 4 — Steering arm nomenclature
5.5 Cable drums shall provide for 760 mm of cable travel minimum.

5.6 Plastics and elastomers shall be designed to resist degradation from ultraviolet radiation, salt

water, hydrocarbons and ozone.

5.7 All steering components shall be sized to prevent derailing or jamming of the cable.

5.8 Components of the steering system shall be resistant to corrosion, either by virtue of material or

coating thereof, and shall be galvanically compatible with adjoining components.
5.9 Cables
5.9.1 Cables shall be of flexible construction.
5.9.2 Wire rope characteri
...