Ergonomic design of control centres - Part 4: Layout and dimensions of workstations (ISO 11064-4:2013)

ISO 11064-4:2013 specifies ergonomic principles, recommendations and requirements for the design of workstations found in control centres. It covers control workstation design with particular emphasis on layout and dimensions. It is applicable primarily to seated, visual-display-based workstations, although control workstations at which operators stand are also addressed. These different types of control workstation are to be found in applications such as transportation control, process control and security installations. Most of these workstations now incorporate flat-display screens for the presentation of information.

Ergonomische Gestaltung von Leitzentralen - Teil 4: Auslegung und Maße von Arbeitsplätzen (ISO 11064-4:2013)

Dieser Teil von ISO 11064 legt ergonomische Grundsätze, Empfehlungen und Anforderungen für die Gestaltung von Arbeitsplätzen in Leitzentralen fest. Dabei werden besonders Auslegung und Maße bei der Gestaltung von Leitplätzen berücksichtigt. Diese Norm ist vor allem anwendbar auf Sitzarbeitsplätze mit Bildschirmgeräten, obgleich Leitplätze, an denen Operatoren stehen, ebenfalls angesprochen werden. Diese verschiedenen Leitplätze finden zum Beispiel Anwendung in der Transport- und Prozesslenkung und in Sicherheitseinrichtungen. Die meisten dieser Arbeitsplätze umfassen jetzt Flachbildschirme zur Darstellung von Information.

Conception ergonomique des centres de commande - Partie 4: Agencement et dimensionnement du poste de travail (ISO 11064-4:2013)

L'ISO 11064-4:2013 spécifie des principes ergonomiques, des recommandations et des exigences relatives à la conception des postes de travail dans les centres de commande. Elle traite de la conception des pupitres de conduite, en prêtant une attention particulière à l'agencement et au dimensionnement. Elle couvre principalement les postes de travail pour posture assise et équipés d'écrans de visualisation, mais concerne également les pupitres de conduite pour posture debout. Ces différents types de pupitres de conduite sont mis en place dans des applications touchant à des domaines tels que le contrôle du transport, la commande de processus et les installations de sécurité. La plupart de ces postes de travail intègrent à l'heure actuelle des écrans plats pour la présentation des informations.

Ergonomsko načrtovanje krmilnih centrov - 4. del: Ureditev in mere delovnih mest (ISO 11064-4:2013)

General Information

Status
Published
Publication Date
19-Nov-2013
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
20-Nov-2013
Completion Date
20-Nov-2013

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SLOVENSKI STANDARD
SIST EN ISO 11064-4:2014
01-marec-2014
1DGRPHãþD
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(UJRQRPVNRQDþUWRYDQMHNUPLOQLKFHQWURYGHO8UHGLWHYLQPHUHGHORYQLKPHVW
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Ergonomic design of control centres - Part 4: Layout and dimensions of workstations

(ISO 11064-4:2013)
Ergonomische Gestaltung von Leitzentralen - Teil 4: Auslegung und Maße von
Arbeitsplätzen (ISO 11064-4:2013)
Conception ergonomique des centres de commande - Partie 4: Agencement et
dimensionnement du poste de travail (ISO 11064-4:2013)
Ta slovenski standard je istoveten z: EN ISO 11064-4:2013
ICS:
13.180 Ergonomija Ergonomics
25.040.10 9HþRSHUDFLMVNLVWURML Machining centres
SIST EN ISO 11064-4:2014 en,fr,de

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

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SIST EN ISO 11064-4:2014
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SIST EN ISO 11064-4:2014
EUROPEAN STANDARD
EN ISO 11064-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2013
ICS 13.180 Supersedes EN ISO 11064-4:2004
English Version
Ergonomic design of control centres - Part 4: Layout and
dimensions of workstations (ISO 11064-4:2013)

Conception ergonomique des centres de commande - Ergonomische Gestaltung von Leitzentralen - Teil 4:

Partie 4: Agencement et dimensionnement du poste de Auslegung und Maße von Arbeitsplätzen (ISO 11064-

travail (ISO 11064-4:2013) 4:2013)
This European Standard was approved by CEN on 24 August 2013.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels

© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11064-4:2013 E

worldwide for CEN national Members.
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SIST EN ISO 11064-4:2014
EN ISO 11064-4:2013 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 11064-4:2014
EN ISO 11064-4:2013 (E)
Foreword

This document (EN ISO 11064-4:2013) has been prepared by Technical Committee ISO/TC 159

"Ergonomics" in collaboration with Technical Committee CEN/TC 122 “Ergonomics” the secretariat of which is

held by DIN.

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 May 2014, and conflicting national standards shall be withdrawn at the

latest by May 2014.

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

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 11064-4:2004.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 11064-4:2013 has been approved by CEN as EN ISO 11064-4:2013 without any modification.

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SIST EN ISO 11064-4:2014
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SIST EN ISO 11064-4:2014
INTERNATIONAL ISO
STANDARD 11064-4
Second edition
2013-11-15
Ergonomic design of control centres —
Part 4:
Layout and dimensions of workstations
Conception ergonomique des centres de commande —
Partie 4: Agencement et dimensionnement du poste de travail
Reference number
ISO 11064-4:2013(E)
ISO 2013
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, 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
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)
Contents Page

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

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

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

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

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

4 Initial control workstation layout considerations ............................................................................................................ 3

5 Factors determining control workstation design ............................................................................................................... 4

5.1 General user considerations ........................................................................................................................................................ 5

5.2 Visual tasks ................................................................................................................................................................................................. 9

5.3 Auditory tasks .......................................................................................................................................................................................10

5.4 Working postures ..............................................................................................................................................................................10

6 Control workstation layout .....................................................................................................................................................................12

6.1 General layout considerations ................................................................................................................................................13

6.2 Layout requirements ......................................................................................................................................................................14

7 Control workstation dimensions ......................................................................................................................................................17

7.1 Dimension considerations .........................................................................................................................................................17

7.2 Seated control workstations ....................................................................................................................................................17

7.3 Standing control workstations ...............................................................................................................................................18

Annex A (informative) Arranging displays and control workstations ............................................................................19

Annex B (informative) Conformance matrix .............................................................................................................................................30

Bibliography .............................................................................................................................................................................................................................37

© ISO 2013 – All rights reserved iii
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(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. 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. 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.

The committee responsible for this document is ISO/TC 159, Ergonomics, Subcommittee SC 4, Ergonomics

of human-system interaction.

This second edition cancels and replaces the first edition (ISO 11064-4:2004), which has been

technically revised.

ISO 11064 consists of the following parts, under the general title Ergonomic design of control centres:

— Part 1: Principles for the design of control centres
— Part 2: Principles for the arrangement of control suites
— Part 3: Control room layout
— Part 4: Layout and dimensions of workstations
— Part 5: Displays and controls
— Part 6: Environmental requirements for control centres
— Part 7: Principles for the evaluation of control centres
iv © ISO 2013 – All rights reserved
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)
Introduction

This part of ISO 11064 establishes ergonomic requirements, recommendations and guidelines for the

design of workplaces in control centres.

All types of control centres are covered, including those for the process industry, transport and

dispatching systems and emergency services. Although this part of ISO 11064 is primarily intended for

non-mobile control centres, many of the principles are relevant to mobile centres such as those found on

ships, locomotives and aircraft.

User requirements are a central theme of this part of ISO 11064 and the processes described are designed

to take into account the needs of users at all design stages. The overall strategy for dealing with user

requirements is presented in ISO 11064-1. ISO 11064-2 provides guidance on the design and planning of the

control room in relation to its supporting areas. Requirements for the layout of the control room are covered

by ISO 11064-3. Displays and controls, human computer interaction and the physical working environment

are presented in ISO 11064-5 and ISO 11064-6. Evaluation principles are dealt with in ISO 11064-7.

The users of this standard are assumed to have some understanding of anthropometry, its use and

limitations, and its application in the context of control rooms. Where this understanding is in doubt, it

is recommended that the advice of an expert be sought.

The ultimate beneficiaries of this part of ISO 11064 will be the operator within the control room and

other such users. It is the needs of these users that provide the ergonomic requirements that are

addressed by the International Standards developers. Although it is unlikely that the end user will read

this International Standard, or even know of its existence, its application should provide the user with

interfaces that are more usable and a working environment which is more consistent with operational

demands, and result in a solution which will improve system performance, minimize error and enhance

productivity.
© ISO 2013 – All rights reserved v
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SIST EN ISO 11064-4:2014
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SIST EN ISO 11064-4:2014
INTERNATIONAL STANDARD ISO 11064-4:2013(E)
Ergonomic design of control centres —
Part 4:
Layout and dimensions of workstations
1 Scope

This part of ISO 11064 specifies ergonomic principles, recommendations and requirements for the design

of workstations found in control centres. It covers control workstation design with particular emphasis

on layout and dimensions. It is applicable primarily to seated, visual-display-based workstations,

although control workstations at which operators stand are also addressed. These different types of

control workstation are to be found in applications such as transportation control, process control

and security installations. Most of these workstations now incorporate flat-display screens for the

presentation of information.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 7250-1:2008, Basic human body measurements for technological design — Part 1: Body measurement

definitions and landmarks

ISO 9241-410:2008, Ergonomics of human-system interaction — Part 410: Design criteria for physical

input devices

ISO 9241-5:1998, Ergonomic requirements for office work with visual display terminals (VDTs) — Part 5:

Workstation layout and postural requirements

ISO 11064-3:1999, Ergonomic design of control centres — Part 3: Control room layout

ISO 11428:1996, Ergonomics — Visual danger signals — General requirements, design and testing

3 Terms and definitions

For the purposes of this part of ISO 11064, the following terms and definitions apply.

3.1
control workstation

single or multiple working position, including all equipment such as computers and communication

terminals and furniture at which control and monitoring functions are conducted
[SOURCE: ISO 11064-3:1999, 3.7.]
3.2
cone of fixations

angular extent to which the line of sight can be swept by rotating the eyeball in the skull while the head rests

© ISO 2013 – All rights reserved 1
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)
3.3
legibility

ability for unambiguous identification of single characters or symbols that may be presented in a non-

contextual format
[SOURCE: ISO 9241-302:2008, 3.3.35.]
3.4
line-of-sight
line connecting the point of fixation and the centre of the pupil

Note 1 to entry: The line-of-sight with two eyes is the line connecting the point of fixation and the midpoint

between the two pupils
[SOURCE: ISO 9241-302:2008, 3.3.36.]
3.5
nearpoint
nearest viewing distance to which the eye accommodates
3.6
normal line-of-sight

inclination of the line-of-sight with respect to the horizontal plane, when the muscles assigned for the

orientation of the eyes are relaxed
3.7
percentile
value of a variable below which a certain percentage of observations fall
3.8
reach envelope

three-dimensional space in which an operator can comfortably reach and manipulate controls by either

hand while assuming a posture normally anticipated for the task
3.9
task zone

space determined by the equipment and activities required for the conduct of a particular task

3.10
visual angle
angle subtended at the eye by the viewed object, e.g. a character or symbol
3.11
visual field, field of vision
physical space visible to an eye in a given position
[SOURCE: ISO 8995:1989, 3.1.10.]

Note 1 to entry: In this standard the use of both eyes is assumed for visual field considerations.

Note 2 to entry: The position of the visual field depends on the direction of the line-of-sight.

Note 3 to entry: Separate, distinct stimuli in the visual field will be detected even if they appear simultaneously.

Note 4 to entry: While the extent of the visual field is approximately ± 35° around the line-of-sight, only between

1° and 2° of these are for sharp vision.
3.12
work environment

physical, chemical, biological, organizational, social and cultural factors surrounding a worker

[SOURCE: ISO 6385:2004, 2.6.]
2 © ISO 2013 – All rights reserved
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)
3.13
work space

volume allocated to one or more persons in the work system to complete the work task

[SOURCE: ISO 6385:2004, 2.15.]
3.14
workstation
combination of work equipment for a particular person in a work space
[SOURCE: ISO 11064-2:2000, 3.5.]

Note 1 to entry: It is possible that several persons may share a particular control workstation, or that several

persons alternate several workstations within any period of time (i.e. on an hourly, daily, weekly basis).

3.15
work task

activity or set of activities required by the worker to achieve an intended outcome

[SOURCE: ISO 6385:2004, 2.17.]
4 Initial control workstation layout considerations

The starting point for control workstation design (shape and dimensions) is a list of work tasks and

related work characteristics. The human operator may need certain facilities, such as displays, input

devices and communication equipment. Work space may also be required for special control-room-

related tasks such as paper work. For each task, a compilation of the requirements of the associated

devices is needed. By taking account of job designs, task zones are combined together into control

workstation arrangements. The grouping of control workstations into control room layouts is discussed

in ISO 11064-2 and ISO 11064-3.

Requirements identified for each task zone are inputs for the detailed engineering of control workstations.

A systematic approach to designing control workstations is presented in Figure 1. The sequence of

stages involved in this process may vary as a result of iterations, and this may have an impact on the

appropriate tasks which need to be undertaken at each stage.
© ISO 2013 – All rights reserved 3
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)
Design steps
Conditions
System objectives
Starting Point (see Clause 4)
· List all tasks to be accomplished at the
Situation analysis
control workstation
· List all physical constraints that may inluence the design i.e.
Task analysis
room shape, supporting ceiling columns, passageways etc.
Tasks to be accomplished at
possible operation modes
Determine the information and control
Area of operator´s responsibility
functions required at control workstation.
Determine and specify the required
Suitable products for
instruments and other materials at each
displays and controls
control workstation (displays, controls,
communication equipment, documents, etc.
Determine the expected work postures
User population (sitting, standing) and the anthropometric
data of the expected user population (ethnic,
Duration of tasks
male and/or female, disabled)
Design the workstation in plan and
elevation. Design for viewing irst , then check
Dimensions of equipment
for control activities. Check for unobstructed
view to all information sources (displays,
persons, windows, etc.) Consider space for
documents, telecom equipment.
Verify and validate the layout and
Design speciication
dimensioning. Involve user participants in
checking designs such as through mock ups and
Maintainability (e.g. access
selecting the preferred option.
to wiring, space for parts re-
Check for maintainability requirements, i.e.
moval etc.)
access from front or rear to exchange parts, etc.
Document the designs, constraints,
Record adopted
alter-native considerations and
compromise
recommendations for future projects.

NOTE Each design stage in the process may result in a feedback loop to one of the earlier steps.

Figure 1 — Control workstation design steps
5 Factors determining control workstation design

This clause is mainly concerned with control workstations with one or more visual displays,

communication tools and space for administrative functions and documentation.
4 © ISO 2013 – All rights reserved
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)
5.1 General user considerations
5.1.1 General requirements

Workstations shall be designed to accommodate from the 5th to the 95th percentiles of dimensions

of the intended user population. When considering the user population, account shall be taken of

the demographic characteristics of the intended users, including gender, age, ethnic background and

disabilities.

Workstations shall be designed according to human capabilities, limitations and needs. Consequently,

the design shall take into consideration the physical characteristics of the user population, including

working postures, visual and aural needs, reach envelopes and their collective influences on control

workstation layout and dimensions.
5.1.2 User requirements

The layout and dimensioning of control workstations shall be governed by the anthropometric dimensions

of the user and any requirements for movement to accomplish his/her tasks. Anthropometric data are

usually given in terms of percentiles.
General anthropometric requirements are the following.

a) The percentile values referred to in this part of ISO 11064 shall be computed from the set of

anthropometric data of the expected user population.

b) Control workstation dimensions shall accommodate at least a range from the 5th to the 95th

percentile of the user population.

c) The following anthropometric data shall be used to primarily determine the control workstation

dimensions:

— reach envelope: 5th percentile of the user population, e.g. reach to critical equipment;

— clearances: 95th percentile of the user population, e.g. clearances under work surfaces.

The key anthropometric dimensions for consideration of a seated operator (in elevation) are shown in

Figure 2. Figure 3 shows the anthropometric dimensions (in elevation) for consideration for a standing

operator, and Figure 4 shows the dimensions in plan view for seated and standing operators. Any design

solution selected should not unnecessarily disadvantage members presenting extreme anthropometric

dimensions of the user population. Design parameters proposed should be checked against the relevant

characteristics of the user population.
© ISO 2013 – All rights reserved 5
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)
e E
k K
Anthropometric measurements Control workstation dimensions
Symbol Description ISO 7250-1:2008 Symbol Description Calculation
subclause
a Eye height, sitting 4.2.2 A Viewing distance
C = d plus shoe heel height minus
b Elbow height, sitting 4.2.5 C Seat pan height range
comfort factor
Horizontal clearance under
c Shoulder height, sitting 4.2.4 E E = h minus g
work surface at knee height
F = d plus e plus shoe heel height
Lower leg length (pop-
d j
d 4.2.12 F Work surface height plus seat cushion thickness plus
liteal height)
work surface thickness
Vertical clearance under G = d plus e plus shoe heel height
e Thigh clearance 4.2.13 G
e 10
work surface plus seat cushion thickness
Armrest height (from seat
f Top of thigh height 4.2.14 J J = b plus seat cushion thickness
pan)
Buttock abdomen depth Horizontal clearance at foot
g 4.2.17 K K = j minus g plus k
g k
sitting level
h Buttock knee length 4.4.7 V Usable work surface depth
j Buttock popliteal length 4.4.6 W Seat pan depth W = j
k Foot length 4.3.7
o Grip reach 4.4.2
m Shoulder elbow length 4.2.6
Function of eye height, sitting and task requirements and equipment.
Range — 5th percentile to 95th percentile.
Use largest h minus smallest g.

Fixed work surface height — use largest d plus largest e. Adjustable work surface height — range of F calculated using (small-

est d and smallest e) and (largest d and largest e).

Fixed work surface height — use largest d added to largest e. Adjustable work surface height — range of G calculated using

(smallest d and smallest e) and (largest d and largest e).
Range — use 5th percentile b to 95th percentile b.
Use largest j minus smallest g plus largest k.
V = derived from task and control equipment requirements.
Use smallest j.
Maximum recommended work surface thickness 40 mm.

This calculation will give maximum values — see recommendation in 5.4.2 for leg and feet clearances.

Figure 2 — Illustration of key anthropometric and control workstation dimensions associated

with seated control workstation in elevation
6 © ISO 2013 – All rights reserved
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SIST EN ISO 11064-4:2014
ISO 11064-4:2013(E)

For standing vertical panels (see Figure 3), controls should not be so low that the standing-tall user must

stoop to reach down to them.

Where no clothing allowances are specified in the anthropometric database, the dimensional effects of

footwear and clothing shall be considered.
The effects of different postures shall be considered.

If it is impossible to cope with this range from the 5th percentile to the 95th with a fixed control

workstation, an adjustable workstation shall be considered.

It may be necessary to combine anthropometric data, though caution should be exercised when doing this.

Usually, the native anthropometric data set is based on naked subjects. Some data sources, however,

include clothing allowance on certain dimensions. The implications of wearing personal protective

equipment should also be considered if a task analysis reveals that this is required.

The control workstation designers shall take account of the changes in eye position, relative to the

location of equipment and the view over the workstation, when different postures are adopted by the

operator (see Table 2).

NOTE Changing between the four postures of “bent forward”, “erect”, “reclined” and “relaxed” results in

changes in the vertical position of the eyes and their relative position relative to the front edge of the workstation,

Another allowance concerns the so-called slump factor (a correction made to measurements taken from

an erect posture), an attempt to simulate more natural and relaxed postures. In some sources, this factor

is included; in others, not. Therefore, data sources should be checked carefully before being applied.

Typically, control workstations will be operated by multiple users who might exhibit a range of

anthropometric features. Control workstation design and layout should take account of this variable

user population.

Adjustable control workstations should be considered and accommodate at least a range from the 5th

percentile to the 95th percentile of the determining body dimensions of the user population (see 7.2).

Adjustment devices should be easy and safe to use from a seated position.
NOTE
...

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