SIST IEC/TR3 61200-704:2000

Electrical installation guide - Part 704: Construction and demolition site installations

This report gives more detailed guidance on the application of the requirements of IEC 60364 to these particular types of installation. To make it easier for users, definitions are repeated, and several examples of important items are listed.  It is for use as a guide for temporary installations provided only for the period of construction, during which they may be frequently modified and relocated.

Guide pour les installations électriques - Partie 704: Installations de chantiers

Ce rapport donne des indications complémentaires relatives à l'application des prescriptions de la CEI 60364 sur ces installations particulières.  Pour des raisons pratiques, les définitions sont répétées et plusieurs exemples sont traités.  Il est utilisé comme guide pour les installations temporaires qui ne sont utilisées que pendant la période de construction durant laquelle elles peuvent être fréquemment modifiées et déplacées.

Vodilo za električne inštalacije – 704. del: Gradbišča

General Information

• Status: Withdrawn
• Publication Date: 31-Jan-2000
• Withdrawal Date: 04-Jun-2023
• ICS: 91.140.50 - Electricity supply systems
• ICS: 91.200 - Construction technology
• Technical Committee: ELI - Electrical and communication installations
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 01-Jun-2023
• Due Date: 24-Jun-2023
• Completion Date: 05-Jun-2023
• Ref Project: IEC 61753-381-2:2016 - Fibre optic interconnecting devices and passive components - Performance standard - Part 381-2: Cyclic arrayed waveguide grating - Category C (controlled environment)

Overview

IEC 61753-381-2:2016 defines the minimum initial test and measurement requirements and severities for Gaussian‑passband‑profile cyclic arrayed waveguide grating (AWG) devices intended for single‑mode, bidirectional transmission in wavelength division multiplexing (WDM) networks. The standard specifies what cyclic AWG components must satisfy to be classified under IEC 61753‑1 Category C (controlled environment). It targets cyclic AWGs with free spectral range (FSR) characteristics that support multiple spectral‑band usage, and applies to devices supplied with single‑mode non‑connectorised pigtails and no electric circuit board.

Key topics and requirements

• Performance scope: Establishes the baseline initial tests and measurement parameters required for Gaussian‑passband‑profile cyclic AWGs used in WDM systems.
• Device type: Covers cyclic AWG devices that provide repeated FSR bands for transmission across multiple spectral bands.
• Transmission modes: Intended for single‑mode and bidirectional transmission scenarios common in WDM deployments.
• Environmental classification: Aligns device verification to Category C (controlled environment) as defined in IEC 61753‑1 - suitable for stable indoor environments with controlled conditions.
• Physical constraints: Applies to AWG components with non‑connectorised single‑mode pigtails and that do not contain electric circuit boards (pure passive optical components).
• Test intent (high level): Specifies minimum initial measurement activities and severity levels needed to demonstrate compliance with IEC 61753‑1 Category C. (Note: the standard text contains the detailed test definitions and severities.)

Applications

• Procurement specifications for passive optical components in WDM networks that require predictable multi‑band FSR behavior.
• Design verification and factory acceptance testing of cyclic AWG modules for metro, access or transport networks using multiple spectral bands.
• Manufacturer quality assurance to demonstrate compliance with IEC 61753 performance categories for controlled environments.
• Test laboratories and system integrators validating AWG performance for single‑mode, bidirectional WDM links.

Who uses this standard

• Optical component manufacturers (AWG vendors)
• Test and certification laboratories
• Network equipment manufacturers and system integrators
• Procurement/specification engineers for telecom operators and data center links
• QA teams responsible for passive WDM component acceptance

Related standards

• IEC 61753‑1 - performance category definitions (Category C = controlled environment) - referenced by this part as the classification framework.

Keywords: Gaussian‑passband‑profile cyclic arrayed waveguide grating (AWG), wavelength division multiplexing (WDM), category C (controlled environment), cyclic AWG, free spectral range (FSR), single‑mode pigtails.

Standards Content (Sample)

IEC 61753-381-2 ®
Edition 1.0 2016-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 381-2: Cyclic arrayed waveguide grating – Category C (controlled
environment)
Dispositifs d'interconnexion et composants passifs à fibres optiques – Norme
de performance –
Partie 381-2: Réseau sélectif planaire cyclique – Catégorie C (environnement
contrôlé)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient 20 000 termes et définitions en anglais
Spécifications techniques, Rapports techniques et autres
et en français, ainsi que les termes équivalents dans 15
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.

Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
65 000 entrées terminologiques électrotechniques, en anglais
La recherche avancée permet de trouver des publications IEC
en utilisant différents critères (numéro de référence, texte, et en français, extraites des articles Termes et Définitions des
comité d’études,…). Elle donne aussi des informations sur les publications IEC parues depuis 2002. Plus certaines entrées
projets et les publications remplacées ou retirées. antérieures extraites des publications des CE 37, 77, 86 et

CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 61753-381-2 ®
Edition 1.0 2016-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Performance

standard –
Part 381-2: Cyclic arrayed waveguide grating – Category C (controlled

environment)
Dispositifs d'interconnexion et composants passifs à fibres optiques – Norme

de performance –
Partie 381-2: Réseau sélectif planaire cyclique – Catégorie C (environnement

contrôlé)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-3096-1

– 2 – IEC 61753-381-2:2016 © IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Test conditions . 7
5 Test report . 7
6 Reference components . 8
7 Performance requirements. 8
7.1 Dimensions . 8
7.2 Test details and requirements . 8
Annex A (normative) Sample size . 14
Annex B (informative) General information on cyclic AWGs . 15
Annex C (informative) Channel frequency range and free spectral range . 17
Annex D (informative) Summary of differences between IEC 61753-081-2 and
IEC 61753-381-2 . 18
Bibliography . 19

Figure 1 – Illustration of cyclic AWGs . 7
Figure B.1 – Single bidirectional transmission with cyclic AWGs . 15
Figure B.2 – Reference diagram of ITU-T G.698.3 . 16
Figure C.1 – Description of channel frequency range and free spectral range . 17

Table 1 – Tests and requirements of optical performance parameters . 9
Table 2 – Environmental tests & mechanical tests . 12
Table A.1 – Sample size . 14
Table D.1 – Summary of differences between IEC 61753-081-2 and IEC 61753-381-2 . 18

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 381-2: Cyclic arrayed waveguide grating –
Category C (controlled environment)

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61753-381-2 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3954/FDIS 86B/3969/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – IEC 61753-381-2:2016 © IEC 2016
A list of all parts in the IEC 61753 series, published under the general title Fibre optic
interconnecting devices and passive components – Performance standard, can be found on
the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 381-2: Cyclic arrayed waveguide grating –
Category C (controlled environment)

1 Scope
This part of IEC 61753 contains the minimum initial test and measurement requirements and
severities which a Gaussian-passband-profile cyclic arrayed waveguide grating (AWG) for
single-mode and bidirectional transmission systems satisfies in order to be categorised as
meeting the requirements of IEC 61753-1 for category C (controlled environment). This
standard pertains to wavelength division multiplexing (WDM) network with multiple spectral-
band usage. This standard covers the requirements of cyclic AWG devices with free spectral
range (FSR) characteristics to ensure multiple spectral bands transmission performance, with
single-mode non-connectorised pigtails and no electric circuit board.
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.
IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-1: Tests – Vibration (sinusoidal)
IEC 61300-2-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-4: Tests – Fibre/cable retention
IEC 61300-2-9, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-9: Tests – Shock
IEC 61300-2-14, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-14: Tests – High optical power
IEC 61300-2-17, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-17: Tests – Cold
IEC 61300-2-18, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-18: Tests – Dry heat – High temperature endurance
IEC 61300-2-19, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-19: Tests – Damp heat (steady state)
IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-22: Tests – Change of temperature
IEC 61300-2-42, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-42: Tests – Static side load for strain relief

– 6 – IEC 61753-381-2:2016 © IEC 2016
IEC 61300-2-44, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-44: Tests – Flexing of the strain relief of fibre optic
devices
IEC 61300-3-2, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-2: Examination and measurements – Polarization
dependent loss in a single-mode fibre optic device
IEC 61300-3-6, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-6: Examinations and measurements – Return loss
IEC 61300-3-20, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-20: Examinations and measurements – Directivity of
fibre optic branching devices
IEC 61300-3-29, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-29: Examinations and measurements – Spectral
transfer characteristics of DWDM devices
IEC 61300-3-32, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-32: Examinations and measurements – Polarization
mode dispersion measurement for passive optical components
IEC 61300-3-38, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-38: Examinations and measurements – Group delay,
chromatic dispersion and phase ripple
IEC 61753-021-2, Fibre optic interconnecting devices and passive components performance
standard – Part 021-2: Grade C/3 single-mode fibre optic connectors for category C –
Controlled environment
IEC 62074-1, Fibre optic interconnecting devices and passive components – Fibre optic WDM
devices – Part 1: Generic specification
ITU-T Recommendation G.692, Optical interfaces for multichannel systems with optical
amplifiers.
ITU-T Recommendation G.694.1, Spectral grids for WDM applications: DWDM frequency grid
ITU-T Recommendation G.698.3, Multichannel seeded DWDM applications with single-
channel optical interfaces
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62074-1, as well as
the following apply.
3.1
cyclic arrayed waveguide grating
cyclic AWG
multi wavelength-selective branching device which can perform the function of a wavelength
multiplexer and/or demultiplexer with DWDM channel spacing
Note 1 to entry: The device has free spectral range (FSR) characteristics for operating in multiple spectral bands. In
the cyclic AWG, the wavelength emerging at the particular output port is spaced by an integer of the FSR as
illustrated in Figure 1. General information on cyclic AWGs is described in Annex B.

Note 2 to entry: This note applies to the French language only.
C-band L-band
FSR
Output
port 1
1 1
Ch Ch
C-band L-band
1 N 1 N
Ch Ch Ch Ch
C-band C-band L-band L-band
Common
port
FSR
Output
N N
Ch Ch
C-band L-band
port N
IEC
Figure 1 – Illustration of cyclic AWGs
3.2
free spectral range
FSR
difference between two adjacent operating wavelengths for a given input output path
Note 1 to entry: This note applies to the French language only.
3.3
wavelength division multiplexing
WDM
multiplexing in which several independent signals are allotted separate wavelengths for
transmission over a common optical transmission medium
Note 1 to entry: This note applies to the French language only.
3.4
dense WDM
DWDM
WDM device intended to operate for channel spacing equal to or less than 1 000 GHz
Note 1 to entry: This note applies to the French language only.
4 Test conditions
All test methods are in accordance with the IEC 61300 series. Each test defines the number
of samples to be evaluated. DWDM devices used for each test are intended to be previously
unstressed new samples but may also be selected from previously used samples if desired.
All measurements shall be carried out at normal room conditions, unless otherwise stated. If
the device is provided with an active temperature control, this shall be set at the set-point
specified by the manufacturer.
All tests are to be carried out to validate performance over the required operating wavelength
range. As a result, single or multiple spectral bands may be chosen for the qualification and
differing target specifications may be assigned to each spectral band.
5 Test report
Fully documented test reports and supporting evidence shall be prepared and shall be
available for inspection as evidence that the tests have been carried out and complied with.
Cyclic-AWG
– 8 – IEC 61753-381-2:2016 © IEC 2016
6 Reference components
The testing for DWDM devices does not require the use of reference components.
7 Performance requirements
7.1 Dimensions
Dimensions shall be in accordance with those given in appropriate manufacturers’ drawings.
7.2 Test details and requirements
Table 1 specifies the optical perfomance and related test methods for Gaussian passband
profile.
Table 2 defines the environmental and mechanical performance requirements and test
methods.
The operating wavelengths, unless otherwise specified, shall be in accordance with ITU
Recommendation G.692, G.694.1 and G.698.3 (Frequency Spacing). Where devices with
wavelength spaced channels have to be considered the conversion should refer to vacuum
wavelength.
The value of "c" (speed of light in vacuum) that should be used for converting between
frequency and wavelength is 2,997 924 58 × 10 m/s.
Conformance to this standard requires demonstration of the ability to meet both the relevant
optical and the environmental parameters.
For connectorized components, the connector performances shall be in accordance with
IEC 61753-021-2.
Table 1 – Tests and requirements of optical performance parameters
No Tests Requirements Details
1 Number of 16 ≤ n ≤ 48 Operating wavelength: ITU-T grid or custom design
channels: n
NOTE Design information
(not test item)
2 Channel Channel central Channel central ITU-T grid or custom design
frequency range frequency:
frequency ± 0,125 × ∆f
1) L-band
where ∆f is the
channel spacing
Minimum channel spacing:
97,15 GHz
Minimum channel
frequency: 186,143 THz
Maximum channel
frequency: 190,709 05 THz
2) C-band
Minimum channel spacing:
100 GHz
Minimum channel
frequency: 191,5 THz
Maximum channel
frequency: 196,2 THz
NOTE Design information
(not test item)
3 Free spectral 5 425,4 GHz Free spectral range
range
NOTE Design information
(not test item)
4 Insertion loss Launch fibre length:
≤ 4,8 dB ≥ 2,0 m
IEC 61300-3-29
Maximum allowable Measurement
±0,05 dB
insertion loss over the
uncertainty
channel frequency
The insertion loss should be
range
determined as the worst case
over all states of polarisation.
5 Channel non- ≤ 1,0 dB (n ≤ 24) Launch fibre length: ≥ 2,0 m
uniformity
≤ 1,5 dB (n > 24) Measurement ±0,05 dB
IEC 61300-3-29
uncertainty
Maximum allowable
channel non-uniformity
The channel non-uniformity
of insertion losses should be determined as the
worst case over all states of
polarisation.
6 1 dB band width Launch fibre length:
≥ 0,25 × ∆ f where ∆ f ≥ 2,0 m
is the channel spacing
IEC 61300-3-29
Measurement
± 0,01 × ∆ f
Minimum allowable
uncertainty:
1 dB band width
The 1 dB band width should be
(centred at the
determined as the worst case
channel frequency)
over all states of polarisation.
7 3 dB band width Launch fibre length:
≥ 0,5 × ∆ f where ∆ f is ≥ 2,0 m
the channel spacing
IEC 61300-3-29
Measurement ± 0,01 × ∆ f
Minimum allowable
uncertainty:
3 dB bandwidth
The 3 dB bandwidth should be
(centred at the
determined as the worst case
channel frequency)
over all states of polarisation.

– 10 – IEC 61753-381-2:2016 © IEC 2016
No Tests Requirements Details
8 Passband ripple Launch fibre length:
≤ 1,5 dB ≥ 2,0 m
IEC 61300-3-29
Maximum insertion Measurement
±0,05 dB
loss variation within
uncertainty:
the channel frequency
The passband ripple should be
range
determined as the worst case
over all states of polarisation.
9 Adjacent Launch fibre length:
≤ -25 dB ≥ 2,0 m
channel
Minimum allowable
Measurement ±0,1 dB
crosstalk
adjacent channel uncertainty:
IEC 61300-3-29
crosstalk over the
The adjacent channel crosstalk
channel frequency
is specified only for
range
demultiplexer.
The adjacent channel crosstalk
should be determined as the
worst case over all states of
polarisation.
10 Non-adjacent
≤ -30 dB Launch fibre length: ≥ 2,0 m
channel
Minimum allowable
Measurement ±0,1 dB
crosstalk
non-adjacent channel uncertainty:
IEC 61300-3-29
crosstalk over the
The non-adjacent channel
channel frequency
crosstalk is specified only for
range
demultiplexer.
The non-adjacent channel
crosstalk should be
determined as the worst case
over all states of polarisation.
11 Total channel ≤ -22 dB (n ≤ 48) Launch fibre length: ≥ 2,0 m
crosstalk
≤ -20 dB (n > 48) Measurement ±0,1 dB
IEC 61300-3-29
uncertainty:
Minimum allowable
total channel crosstalk
The total adjacent channel
value crosstalk is specified only for
demultiplexer.
The total adjacent channel
crosstalk should be
determined as the worst case
over all states of polarisation.
12 Polarisation ≤ 0,4 dB Launch fibre length: ≥ 2,0 m
dependent loss
Maximum allowable Measurement
±0,05 dB
(PDL)
PDL over the channel uncertainty:
IEC 61300-3-2
frequency range
The allowable PDL
combination applies to all
combination of input and
output ports
13 Polarisation Launch fibre length:
≤ 0,5 ps ≥ 2,0 m
mode dispersion
Maximum allowable
Measurement ±0,1 ps
(PMD)
PMD over the channel
uncertainty:
IEC 61300-3-32 frequency range
The allowable PMD
combination applies to all
combination of input and
output ports
No Tests Requirements Details
14 Chromatic Launch fibre length:
≤ 20 ps/nm for ≥ 2,0 m
dispersion (CD)
97,15 GHz minimum
Measurement
±1 ps/nm
channel spacing
IEC 61300-3-38
uncertainty:
≤ 20 ps/nm for
NOTE The allowable CD
100 GHz minimum
combination applies to all
channel spacing
combination of input and
Maximum allowable output ports
CD over the channel
frequency range
(absolute value)
15 Return loss Launch fibre length:
≥ 40 dB ≥ 2,0 m
IEC 61300-3-6
Minimum allowable Measurement
±1 dB
return loss uncertainty:
All ports not under test should
be terminated to avoid
unwanted reflections
contributing to the
measurement
16 Directivity
≥ 40 dB Launch fibre length: ≥ 2,0 m
IEC 61300-3-20 Maximum allowable
Measurement ±1 dB
directivity uncertainty:
All ports not under test should
be terminated to avoid
unwanted reflections
contributing to the
measurement
The directivity shall be
measured between any pair of
input or output ports
17 High optical Before and after the Optical power 300 mW
power test, the limits of
Wavelength 1 550 nm
insertion loss and
IEC 61300-2-14
return loss of tests
Duration of the optical 30 min
no. 4 and 15 shall be
power exposure
met.
Temperature:
+60 °C ± 2 °C
During the test, the
insertion loss change
Relative humidity:
+2
% RH
is monitored. During
−3
and after the test, the
insertion loss change Input port Common port
shall be within ±0,3 dB
of the initial value.
During the test, the
return loss change is
monitored. The sum of
the initial value and
the change of the
return loss shall be
within the value
defined at test no. 5.
– 12 – IEC 61753-381-2:2016 © IEC 2016
Table 2 – Environmental tests & mechanical tests
No Tests Requirements Details
18 Cold Before and after the test, Temperature: –10 °C ± 2 °C
the limits of insertion
IEC 61300-2-17
Duration of 96 h
loss and return loss of
exposure:
tests no. 4 and 15 shall
be met.
The insertion loss
change after the test
shall be within ±0,3 dB
of the initial value.
19 High Before and after the test, Temperature: +60 °C ± 2 °C
temperature the limits of insertion
Duration of 96 h
endurance loss and return loss of
exposure:
tests no. 4 and 15 shall
IEC 61300-2-18
be met.
The insertion loss
change after the test
shall be within ±0,3 dB
of the initial value.
20 Damp heat Before and after the test, Temperature:
+40 °C ± 2 °C
the limits of insertion
(steady state)
Relative humidity:
+2
loss and return loss of
93 % RH
−3
tests no. 4 and 15 shall
IEC 61300-2-19
be met.
Duration of 96 h
During the test, the exposure:
insertion loss change is
monitored. During and
after the test, the
insertion loss change
shall be within ±0,3 dB of
the initial value.
21 Change of Before and after the test, High temperature:
+60 °C ± 2 °C
temperature the limits of insertion
Low temperature:
–10 °C ± 2 °C
loss and return loss of
IEC 61300-2-22
tests no. 4 and 15 shall
Number of cycles: 5
be met.
Duration at extreme 60 min
During and after the test,
temperature:
the insertion loss change
shall be within ±0,5 dB
Rate of change: 1 °C/min
of the initial value.
22 Vibration Before and after the test, Frequency range: 5 Hz to 55 Hz
the limits of insertion
IEC 61300-2-1
Number of axes: 3 orthogonal axes
loss and return loss of
tests no. 4 and 15 shall
Number of sweeps: 15 per axis
be met.
Sweep rate: 1 octave per minute
The insertion loss
change after the test
Amplitude: 0,75 mm
shall be within ±0,3 dB
of the initial value.
No Tests Requirements Details
23 Fibre/cable Before and after the test, Magnitude and rate (10 ± 1) N at 5 N/s for reinforced
retention the limits of insertion of application: cables
loss and return loss of
IEC 61300-2-4
(5,0 ± 0,5) N at 0,5 N/s for
tests no. 4 and 15 shall
secondary coated fibres
be met.
(2,0 ± 0,2) N at 0,5 N/s for primary
The insertion loss
coated fibres
change after the test
shall be within ±0,3 dB
Duration of the test 120 s duration at 10 N
of the initial value.
60 s duration at 2 N or 5 N
Point of application 0,3 m from the exit point of the
of tensile load: fibre/cable from the specimen.
Method of mounting: The sample shall be rigidly
mounted such that the load is only
applied to the fibre/cable retention
mechanism
24 Shock Before and after the test, Acceleration: Components: 5 000 m/s
the limits of insertion
IEC 61300-2-9 Modules:
loss and return loss of
tests no. 4 and 15 shall
0,125 kg < module mass ≤ 0,225
be met. 2
kg: 2 000 m/s
The insertion loss
0,225 kg < module mass ≤ 1 kg:
change after the test
500 m/s
shall be within ±0,3 dB
of the initial value.
Duration: 1 ms, half sine pulse
Number of axis: 3 axes in 2 directions
Number of shocks: 2 shocks per axis, 12 shocks in
total
25 Static side load Before and after the test, Magnitude and 1 N for 1 h for reinforced cable
the limits of insertion duration of the
IEC 61300-2-42 0,2 N for 5 min for secondary
loss and return loss of tensile load:
coated fibres
tests no. 4 and 15 shall
be met.
Direction of Two mutually perpendicular
application: directions
The insertion loss
change after the test
shall be within ±0,3 dB
of the initial value.
26 Flexing of the Magnitude of the 2,0 N ± 0,2 N for reinforced cable
strain relief of load:
After the test the return
fibre optic
loss limits of test no. 3
Rate of load 0,5 N/s for reinforced cable
devices
shall be met.
application:
Load application 0,2 m from end of device

point:
IEC 61300-2-44
Number of cycles: 30
Measurements Return loss shall be measured
required: before and after the test.

– 14 – IEC 61753-381-2:2016 © IEC 2016
Annex A
(normative)
Sample size
All samples shall be subjected to tests 1 to 14 (see Table A.1). All other tests shall be done in
any following order. Consecutive testing on the same optical sample is allowed, but in case of
failure during the consecutive testing, a new sample shall be prepared and the failed test shall
be redone.
Table A.1 – Sample size
No Tests Sample size
4 Insertion loss 12
5 Channel non-uniformity 12
6 1 dB bandwidth 12
7 3 dB bandwidth 12
8 Passband ripple 12
9 Adjacent channel crosstalk 12
10 Non-adjacent channel crosstalk 12
11 Total channel crosstalk 12
12 Polarisation dependent loss (PDL) 12
13 Polarisation mode dispersion (PMD) 12
14 Chromatic dispersion 12
15 Return loss 12
16 Directivity 12
17 High optical power 12
18 Cold 4
19 High temperature endurance 4
20 Damp heat (steady state) 4
21 Change of temperature 4
22 Vibration (sinusoidal) 4
23 Fibre/Cable retention 4
24 Shock 4
25 Static side load 4
26 Flexing of the strain relief of fibre optic devices 4
Number 1, 2 and 3 from Table 1 are not mentioned for sample size because they are not tests and so no sample
size needs to be defined.
Annex B
(informative)
General information on cyclic AWGs

AWGs are commonly used as WDM transmission systems in order to multiplex or demultiplex
a large number of optical channels which all have a different wavelength. Single bidirectional
transmissions were introduced to increase system capacity without additional optical fibre. A
cyclic AWG is very attractive for the optical demultiplexer and multiplexer (OD/OM) in single
bidirectional transmission systems as shown in Figure B.1.
Receiver Receiver′
1 Signal λ′ Signal λ 1
1 1
Single bidirectional fibre
Signal λ Signal λ′
Transmitter 1 1 Transmitter′
1 1
Receiver Receiver′
N Signal λ′ Signal λ N
N N
Signal λ Signal λ′
Transmitter N N Transmitter′
N N
West side East side
IEC
Figure B.1 – Single bidirectional transmission with cyclic AWGs
To avoid reflection and crosstalk between the signals in different direction, the systems
employ two different bands, typically C-band and L-band. Usage of cyclic AWGs will ensure
simple configuration of the WDM multiplexer (MUX) and de-multiplexer (DeMUX) thanks to the
optical characteristics of FSR in the AWG.
In ITU-T G.698.3, single bidirectional fibre is used to connect the head-end to the passive
OD/OM (see Figure B.2). The central frequencies of all channels in the head-end to tail-end
direction lie on the frequency grid for the minimum channel spacing given in ITU-T G.694.1.
The central frequencies of all channels in the tail-end to head-end direction do not lie on the
frequency grid for the minimum channel spacing given in ITU-T G.694.1. Instead, they are
determined by the free spectral range of the cyclic OD/OM device such as the cyclic AWG.
Cyclic AWG
Cyclic AWG
– 16 – IEC 61753-381-2:2016 © IEC 2016
R for signals
s
going
Rx Rx
1 1
Tx Tx
1 1
S for signals
s
MPI-S
M
going
for signals
R
s
going
Rx Rx
2 2
Tx Tx
2 2
S
s
MPI-R
M
for signals
going
R
s
Rx Rx
N N
Tx Tx
N N
Seed
S
s
source
Head-end Tail-end
IEC
Figure B.2 – Reference diagram of ITU-T G.698.3
OD/OM
OD/OM
Annex C
(informative)
Channel frequency range and free spectral range

C-band L-band
Ch1 Ch2 ChN-1 ChN Ch1 Ch2 ChN-1 ChN
Channel Channel Channel Channel
spacing spacing spacing spacing
Minimum Minimum Minimum Minimum
channel channel channel channel
frequency frequency frequency frequency

Free spectral range
IEC
Figure C.1 – Description of channel frequency range and free spectral range

– 18 – IEC 61753-381-2:2016 © IEC 2016
Annex D
(informative)
Summary of differences between IEC 61753-081-2 and IEC 61753-381-2

Table D.1 – Summary of differences between IEC 61753-081-2 and IEC 61753-381-2
Operating
Number of Channel FSR
Application wavelength
channels spacing requirement
range
50 GHz, 100 GHz
FSR > Operating
IEC 61753-081-2 16 ≤ n ≤ 64 no limitation Single band
and 200 GHz
wavelength range
5 425,4 GHz
C-band: 100 GHz
Both C and L
(FSR < Operating
IEC 61753-381-2 16 ≤ n ≤ 48 described
band
L-band:97,15GHz wavelength
range)
Bibliography
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures
IEC 61753-081-2, Fibre optic interconnecting devices and passive components – Performance
standard – Part 081-2: Non-connectorized single-mode fibre optic middle-scale 1 × N DWDM
devices for category C – Controlled environments
IEC 61753-1, Fibre optic interconnecting devices and passive components performance
standard – Part 1: General and guidance for performance standards
ITU-T G.Supplement 39, Optical system design and engineering considerations (09/2012)

_____________
– 20 – IEC 61753-381-2:2016 © IEC 2016
SOMMAIRE
AVANT - PRO PO S . 21
1 Domaine d'application . 23
2 Références normatives . 23
3 Termes et définitions . 24
4 Conditions d’essai . 26
5 Rapport d’essai . 26
6 Composants de référence . 26
7 Exigences de performances . 26
7.1 Dim ens ions . 26
7.2 Exigences et détails des essais . 26
Annexe A (normative) Taille d'échantillon . 33
Annexe B (informative) Informations générales sur les AWG cycliques . 34
Annexe C (informative) Plage de fréquences du canal et plage spectrale libre . 36
Annexe D (informative) Synthèse des différences entre l'IEC 61753-081-2 et
l'IEC 61753-381-2 . 37
B i b l i o gr a p h i e . 38

Figure 1 – Représentation d'un AWG cyclique . 25
Figure B.1 – Transmission bidirectionnelle unique avec des AWG cycliques . 34
Figure B.2 – Schéma de référence de la Recommandation UIT-T G.698.3 . 35
Figure C.1 – Description de la plage de fréquences du canal et de la plage spectrale
libre . 36

Tableau 1 – Essais et exigences concernant les paramètres de performances optiques . 27
Tableau 2 – Essais environnementaux et essais mécaniques . 31
Tableau A.1 – Taille d'échantillon . 33
Tableau D.1 – Synthèse des différences entre l'IEC 61753-081-2 et l'IEC 61753-381-2 . 37

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
DISPOSITIFS D'INTERCONNEXION ET
COMPOSANTS PASSIFS À FIBRES OPTIQUES –
NORME DE PERFORMANCE –
Partie 381-2: Réseau sélectif planaire cyclique –
Catégorie C (environnement contrôlé)

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (IEC) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l’IEC). L’IEC a pour
objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines
de l'électricité et de l'électronique. A cet effet, l’IEC – entre autres activités – publie des Normes internationales,
des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au public (PAS) et des
Guides (ci-après dénommés "Publication(s) de l’IEC"). Leur élaboration est confiée à des comités d'études, aux
travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les organisations
internationales, gouvernementales et non gouvernementales, en liaison avec l’IEC, participent également aux
travaux. L’IEC collabore étroitement avec l'Organisation Internationale de Normalisation (ISO), selon des
conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de l’IEC concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de l’IEC
intéressés sont représentés dans chaque comité d’études.
3) Les Publications de l’IEC se présentent sous la forme de recommandations internationales et sont agréées
comme telles par les Comités nationaux de l’IEC. Tous les efforts raisonnables sont entrepris afin que l’IEC
s'assure de l'exactitude du contenu technique de ses publications; l’IEC ne peut pas être tenue responsable de
l'éventuelle mauvaise utilisation ou interprétation qui en est faite par un quelconque utilisateur final.
4) Dans le but d'encourager l'uniformité internationale, les Comités nationaux de l’IEC s'engagent, dans toute la
mesure possible, à appliquer de façon transparente les Publications de l’IEC dans leurs publications nationales
et régionales. Toutes divergences entre toutes Publications de l’IEC et toutes publications nationales ou
régionales correspondantes doivent être indiquées en termes clairs dans ces dernières.
5) L’IEC elle-même ne fournit aucune attestation de conformité. D
...

SLOVENSKI STANDARD
01-februar-2000
9RGLOR]DHOHNWULþQHLQãWDODFLMH±GHO*UDGELãþD
Electrical installation guide - Part 704: Construction and demolition site installations
Guide pour les installations électriques - Partie 704: Installations de chantiers
Ta slovenski standard je istoveten z: IEC/TR 61200-704
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
91.200 Gradbena tehnologija Construction technology
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEI
RAPPORT
IEC
TECHNIQUE - TYPE 3
1200-704
TECHNICAL
Première édition
REPORT - TYPE 3 First edition
1996-03
les installations électriques
Guide pour
704:
Partie
Installations de chantiers
Electrical installation guide —
Part 704:
Construction and demolition site installations
de reproduction réservés—Copyright — all rights reserved
© CEI 1996 Droits
No part of this publication may be reproduced or utilized in
Aucune partie de cette publication ne peut être reproduite ni
any form or by any means, electronic or mechanical,
utilisée sous quelque forme que ce soit et par aucun pro-
including photocopying and microfilm, without permission
cédé, électronique ou mécanique, y compris la photocopie et
in writing from the publisher.
les microfilms, sans l'accord écrit de l'éditeur.
Genève, Suisse
Bureau Central de la Commission Electrotechnique Inte rnationale 3, rue de Varembé
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission PRICE CODE S
IEC MetwtyHapoAHaa 3neKrpoTexHHVecnaa HOMHCCHA
vigueur
Pour prix, voir catalogue en •
•
For price, see current cata logue

1200-704 © IEC:1996 — 3 —
CONTENTS
Page
FOREWORD 5
INTRODUCTION 9
Clause
704.1 Scope
704.2 Normative references and definitions
Assessment of general characteristics 704.3
704.312 Types of distribution systems
Conditions of external influences 704.32
704.36 Safety circuits
704.4 Protection for safety
704.41 Protection against electric shock
35 704.43 Protection against overcurrent
Selection and erection of equipment 704.5
704.51 Common rules
704.52 Wiring systems
704.53 Switchgear and controlgear
Earthing arrangements and protective conductors -704.54
704.6 Verification
Initial verification 704.61
704.62 Periodic verification
Supervision 704.63
704.64 Maintenance
1200-704 © IEC:1996 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ELECTRICAL INSTALLATION GUIDE —
Part 704: Construction and demolition site installations
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object to the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and electronic
fields. To this end and in addition to other activities, the IEC publishes International Standards. Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt
with may participate in this preparatory work. International, governmental and non-governmental organizations
liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters, express as nearly as possible an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the
rt
form of standards, technical repo s or guides and they are accepted by the National Committees in that
sense.
4)
In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5)
The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the
subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
repo rt of one of the following types:
• type 1, when the required suppo rt cannot be obtained for the publication of an International
Standard, despite repeated effo rts;
• type 2, when the subject is still under technical development or where for any other reason
there is the future but not immediate possibility of an agreement on an International
Standard;
• type 3, when a technical committee has collected data of a different kind from that which is
normally published as an International Standard, for example "state of the art".
Technical repo rt
s of types 1 and 2 are subject to review within three years of publication to
decide whether they can be transformed into International Standards. Technical repo rts of
type 3 do not necessarily have to be reviewed until the data they provide are considered to be
no longer valid or useful.
1200-704 © IEC:1996 –7–
International Standard IEC 1200-704, which is a technical report of type 3, has been prepared
by IEC technical committee 64: Electrical installations of buildings.
The text of this standard is based on the following documents:
Committee draft Repo rt on voting
64(SEC)697 64(SEC)736
Full information on the voting for the approval of this standard can be found in the report on voting
indicated in the above table.
1200-704 © IEC:1996 – 9 –
INTRODUCTION
This technical report does not form part of IEC 364. It is a supplement to IEC 364-7-704, of
which it explains the rules so as to facilitate the design, the execution and the maintenance of
electrical installations on construction and demolition sites.
It is written for everyone concerned with the design, the selection and supply of equipment, as
well as the persons who install, maintain and use these installations.
The chapters, sections and clauses are, in some cases, marked with the following information:
modification, recommendation or explanation.

–11 –
1200-704 © IEC:1996
ELECTRICAL INSTALLATION GUIDE —
Part 704: Construction and demolition site installations
704.1 Scope
This technical report is for use as a guide for temporary installations provided only for the
period of construction, during which they may be frequently modified and relocated. They are
dismantled and removed upon completion of the works.
The object of this report is to give more detailed guidance on the application of the
requirements of IEC 364 to these particular types of installation, in a form convenient for use
by persons concerned with these types of installation. To make it easier for users, definitions
are repeated, and several examples of important items are listed.
It describes practical means of satisfying the requirements, based on experience and practice,
but it does not exclude the use of other means which provide the same level of safety and
reliability.
704.2 Reference documents and definitions
704.2.1 Reference documents
International Electrotechnical Vocabulary (lEV) – Chapter 826: Electrical
IEC 50(826): 1982,
installations of buildings
Amendment 1 (1990)
Rubber insulated cables of rates voltages up and including 450/750 V – Pa rt 4:
IEC 245-4: 1980,
Cords and flexible cables
2: Definitions – Chapter 21:
Electrical installations of buildings – Part
IEC 364-2-21: 1993,
Guide to general terms
rt 3: Assessment of general characteristics
IEC 364-3: 1993, Electrical installations of buildings – Pa
Electrical installations of buildings – Pa rt 4: Protection for safety – Chapter 41:
IEC 364-4-41: 1992,
Protection against electric shock
rt 4: Protection for safety – Chapter 43:
IEC 364-4-43: 1977, Electrical installations of buildings – Pa
Protection against overcurrent
4: Protection for safety – Chapter 47:
IEC 364-4-473: 1977, Electrical installation of buildings – Pa rt
Application of protective measures for safety – Section 473: Measures of protection against
overcurrent
Electrical installations of buildings – Pa rt 5: Selection and erection of electrical
IEC 364-5-51: 1994,
equipment – Chapter 51: Common rules
rt 5: Selection and erection of electrical
Electrical installations of buildings – Pa
IEC 364-5-52: 1993,
equipment – Chapter 52: Wiring systems

1200-704 © IEC:1996 –13 –
IEC 364-5-53: 1994, Electrical installations of buildings – Part 5: Selection and erection of
electrical equipment – Chapter 53: Switchgear and controlgear
IEC 364-5-54: 1980, Electrical installations of buildings – Part 5: Selection and erection of
electrical equipment – Chapter 54: Earthing arrangements and protective conductors
Electrical installations of buildings – Part 6: Verification – Chapter 61:
IEC 364-6-61: 1986,
Initial verification
IEC 364-7-704: 1989, Electrical installations of buildings – Pa rt 7: Requirements for special
installations or locations – Section 704: Construction and demolition site installations
Electrical installations of buildings – Pa rt 7: Requirements for special
IEC 364-7-706: 1983,
installations or locations – Section 706: Restrictive conducting locations
4: Particular
IEC 439-4: 1990, Low-voltage switchgear and controlgear assemblies – Pa rt
requirements for assemblies for construction sites (A CS)
IEC 598-2-22:1990, Luminaires – Part 2: Particular requirements – Section twenty-two:
Luminaires for emergency lighting
Protection of structures against lightning – Pa rt 1: General principles
IEC 1024-1: 1990,
704.2.2 Definitions
For the purpose of this technical repo rt, the following definitions apply:
Chapter 826 of the International Electrotechnical Vocabulary (IEV)
704.2.2.1
Any current exceeding the rated value. For conductors, the rated value is the
overcurrent:
current-carrying capacity [IEV 826-05-06].
overload current: An overcurrent occurring in a circuit in the absence of an electrical fault
[IEV 826-05-07].
An overcurrent resulting from a fault of negligible impedance between
short-circuit current:
live conductors having a difference in potential under normal operating conditions
[IEV 826-05-08].
portable equipment: Equipment which is moved while in operation or which can easily be
moved from one place to another while connected to the supply [IEV 826-07-04].
hand-held equipment: Portable equipment intended to be held in the hand during normal use,
in which the motor, if any, forms an integral pa rt of the equipment [IEV 826-07-05].
NOTE – The use of hand-held equipment requires the constant use of one hand, either for support or guidance.
Electrical installations of buildings – Part 2: Definitions – Chapter 21: Guide to general terms (1993)
*IEC 364-2-21:
contains explanatory notes on terms used in IEC 364 and defined in IEC 50(826).

1200-704 © IEC:1996 –15 –
Either fixed equipment or equipment not provided with a carrying
stationary equipment:
handle and having such a mass that it cannot easily be moved [IEV 826-07-06].
fixed equipment: Equipment fastened to a support or otherwise secured in a specific location
[IEV 826-07-07].
isolation: A function intended to cut off for reasons of safety the supply from all or a discrete
section of the installation by separating the installation or section from every source of
electrical energy [IEV 826-08-01].
switching-off for mechanical maintenance: An operation intended to inactivate an item or
items of electrically powered equipment for the purpose of preventing danger, other than due to
electric shock or to arcing, during non-electrical work on this equipment [IEV 826-08-02].
emergency switching: An operation intended to remove as quickly as possible danger which may
have occurred unexpectedly [IEV 826-08-03].
Emergency switching intended to stop a movement which has become
emergency stopping:
dangerous [IEV 826-08-04].
" or vary the supply of electrical
functional switching: An operation intended to switch "on" or "off
of an installation for normal operating purposes [IEV 826-08-05].
energy to all or part
704.2.2.2 Other IEC publications
A restrictive conducting location is one comprised mainly of
restrictive conducting location:
metallic or conductive surrounding pa rts, within which it is likely that a person will come in
ion of his body with the conductive surrounding parts and
contact through a substantial po rt
where the possibility of interrupting this contact is limited [706.1 of IEC 364-7-706].
Low-voltage switchgear and controlgear assembly for construction sites (ACS): A
combination of one or several transforming or switching devices with associated control,
measuring, signalling, protective and regulating equipment complete with all their internal
rts, designed and built for use on all
electrical and mechanical connections and structural pa
construction sites, indoors and outdoors [2.1.1.3 of IEC 439-4].

1200-704 © IEC:1996 –17 –
704.3 Assessment of general characteristics
704.312 Types of distribution systems (see 312 of lEC 364-3)
704.312.2 Types of system earthing
The following systems are permitted in installations:
704.312.2.1 TN systems
TN power systems have one point directly earthed, the exposed-conductive-parts of the
installation being connected to that point by protective conductors. Three types of TN systems
are considered according to the arrangement of neutral and protective conductors, as follows:
– TN-S system: in which throughout the system, a separate protective conductor is used;
– TN-C-S system: in which neutral and protective functions are combined in a single
conductor in a pa rt of the system;
– TN-C system: in which neutral and protective functions are combined in a single
conductor throughout the system.
TN-C TN-S
• ; •
L1 O
.
• •
L2 O .
i
• •
L3 O ^ I I
;
• ;
PE
PEN T
.
^
N
,. I f
...
. • ;
^.-
8 ._._._._._._._._._._._._.
•-•--- •- •- •- •- •-•-•-•-
Exposed-conductive-parts
Earthing of system
Figure 1 – TN-C-S system. Neutral and protective functions combined
in a single conductor in a part of the system

1200-704 © IEC:1996 -19 -
704.312.2.2 TT system
The TT power system has one point directly earthed, the exposed-conductive-parts of the
installation being connected to earth electrodes electrically independent of the earth electrodes
of the power system.
11 O 11 O
L2 O L2 O
L3 O L3 O
N O
._.^._._._._.^
PE
f
f / I
I
._._._._._._.:
Exposed-conductive-parts
Exposed-conductive-parts
Earthing of system Earthing of system
Figure 2 - TT system
704.312.2.3 IT system
The IT power system has all live pa rts isolated from earth, or one point connected to earth
through an impedance, the exposed-conductive-parts of the electrical installation being earthed
independently, collectively, or to the earthing of the system (see 413.1.5 of IEC 364-4-41).
11 O
11 O
O
L2 O L2
•
O
L3 O L3    •
Impedance
^- •-•---•-
'PE
T
-parts— Exposed-conductive-parts—
Earthing of system Exposed-conductive
Earthing of system
1)The system may be isolated from earth.
2)The neutral may or may not be distributed.
Figure 3 - IT system
Subclause 704.413.1 deals with the choice of earthing systems for site installations.

1200-704 © IEC:1996 – 21 –
704.312.3
Installation systems
Figures 4 and 5 show examples of two installation arrangements corresponding to small,
medium and large sites.
The choice of protection must take account of the probability of faults, the risks from wear and
tear, especially when the insulation can be damaged as a result of tension, flexing, abrasion or
severing. The condition of a construction site and the access to the installation by ordinary
persons (BA1) also increases the probability of faults.
Most of these sites are supplied from transformer substations forming part of the site
installation. The earthing systems therefore can be chosen according to the recommendations
of 704.413.1.
Supply of
electrical
energy
Protective
conductor
Earthing
conductor
Earthing electrode of the
new construction
The emergency switching may be combined with the residual current device or be separate.
May be supplied by a safety isolating transformer for use in restrictive conducting locations.
Figure 4 – Example of an installation of a small size construction site
The installation is connected to the supply by means of a single ACS. The device for switching
and protection embodies a residual current protective device with a residual operating current
not exceeding 30 mA, because all the equipment is either portable or hand-held.

1200-704 © IEC:1996 – 23 –
T
...