IEC 62282-3-3:2007

IEC 62282-3-3
Edition 1.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fuel cell technologies –
Part 3-3: Stationary fuel cell power systems – Installation

Technologies des piles à combustible –
Partie 3-3: Systèmes à piles à combustible stationnaires – Installation

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 la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: 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.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
A propos de la CEI
La Commission Electrotechnique Internationale (CEI) 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 CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
ƒ Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm
Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,
texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.
ƒ Just Published CEI: www.iec.ch/online_news/justpub
Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles
publications parues. Disponible en-ligne et aussi par email.
ƒ Electropedia: www.electropedia.org
Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et
définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé
Vocabulaire Electrotechnique International en ligne.
ƒ Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm
Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du
Service clients ou contactez-nous:
Email: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC 62282-3-3
Edition 1.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fuel cell technologies –
Part 3-3: Stationary fuel cell power systems – Installation

Technologies des piles à combustible –
Partie 3-3: Systèmes à piles à combustible stationnaires – Installation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
Q
CODE PRIX
ICS 27.070 ISBN 2-8318-9372-0
– 2 – 62282-3-3 © IEC:2007
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.7
2 Normative references .8
3 Terms and definitions .8
4 General safety requirements and strategy .10
5 Siting considerations .11
5.1 General siting.11
5.2 Outdoor installations .12
5.3 Indoor installations .12
5.3.1 Large fuel cell power systems.12
5.3.2 Small fuel cell power systems.12
5.4 Rooftop installation.12
6 Ventilation and exhaust .12
6.1 General .12
6.2 Ventilation .12
6.3 Exhaust system .13
6.4 Process purging and venting .13
7 Fire protection and gas detection.13
7.1 Fire protection and detection .13
7.1.1 Site fire protection .13
7.1.2 Combustible gas detection (indoor installations only).13
7.2 Fire prevention and emergency planning .14
8 Interconnections with site interfaces .14
8.1 General .14
8.2 Connections to fuel supplies – General .14
8.3 Fuel shut off and piping .14
8.4 Connections to auxiliary media supply and media disposal.14
8.4.1 Combustible auxiliary gases .14
8.4.2 Non combustible or inert auxiliary gases.14
8.4.3 Water .15
8.4.4 Waste water disposal .15
8.4.5 Discharge pipe .15
9 Environmental requirements .15
10 Approval tests .15
10.1 Gas leakage .15
10.2 Site specific shutdown devices .15
11 Maintenance tests .15
12 Documentation .15
12.1 Markings and instructions.15
12.2 Inspection checklist .16
12.3 Installation manual .16
12.4 User’s information manual.16
12.5 Maintenance manual .16

62282-3-3 © IEC:2007 – 3 –
Figure 1 – Fuel cell power system.7

– 4 – 62282-3-3 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
FUEL CELL TECHNOLOGIES –
Part 3-3: Stationary fuel cell power systems –
Installation
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 62282-3-3 has been prepared by IEC technical committee 105:
Fuel cell technologies.
The text of this standard is based on the following documents:
FDIS Report on voting
105/152/FDIS 105/170/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.

62282-3-3 © IEC:2007 – 5 –
A list of all parts of the IEC 62282 series, under the general title Fuel cell technologies, can
be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site 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.
– 6 – 62282-3-3 © IEC:2007
INTRODUCTION
This International Standard covers the installation of stationary fuel cell power systems that
are built in compliance with IEC 62282-3-1.
The requirements of this standard are not intended to constrain innovation. Installations
employing materials and/or methods differing from those detailed in this standard may be
examined and tested according to the intent of the requirements and, if found to be
substantially equivalent, may be considered to comply with the standard.

62282-3-3 © IEC:2007 – 7 –
FUEL CELL TECHNOLOGIES –
Part 3-3: Stationary fuel cell power systems –
Installation
1 Scope
This part of IEC 62282 provides minimum safety requirements for the installation of indoor
and outdoor stationary fuel cell power systems in compliance with IEC 62282-3-1 and applies
to the installation of the mentioned systems
– intended for electrical connection to mains directly or with a transfer switch,
– intended for a stand-alone power distribution system,
– intended to provide AC or DC power,
– with or without the ability to recover useful heat.
This part of IEC 62282 does not cover:
– fuel supply and/or fuel storage systems,
– power connector to the grid,
– portable fuel cell power systems,
– propulsion fuel cell power systems,
– APU (auxiliary power units) applications.
A typical stationary fuel cell power system installation is represented in Figure 1.

System boundary
Power inputs
Recovered heat
Thermal
Electrical management
Thermal system
Waste heat
Fuel
Fuel
processing
Useable power
Fuel
system
electrical
cell
Power
module
conditioning
system
Oxidant
Oxidant
processing Water
system treatment
Internal power
Ventilation
Discharge
system
needs
water
Inert gas
Exhaust gases
ventilation
Onboard
Automatic
Water
Ventilation
energy
control
system
storage
system
EMI
EMD
noise
vibration,
vibration
wind, rain,
temperature
etc.
IEC  2208/07
Figure 1 – Fuel cell power system

– 8 – 62282-3-3 © IEC:2007
Fuel cell power systems are divided into two categories:
– Small systems.
– Large systems.
Definitions are given in Clause 3.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60079-10, Electrical apparatus for explosive gas atmospheres – Part 10: Classification of
hazardous areas
IEC 61511-3, Functional safety – Safety instrumented systems for the process industry sector
– Part 3: Guidance for the determination of the required safety integrity levels
IEC 61779-4: Electrical apparatus for the detection and measurement of flammable gases –
Part 4: Performance requirements for group II apparatus indicating up to 100 % lower
explosive limit
IEC 61779-6: Electrical apparatus for the detection and measurement of flammable gases –
Part 6: Guide for the selection, installation, use and maintenance of apparatus for the
detection and measurement of flammable gases
IEC 61882, Hazard and operability studies (HAZOP studies) – Application guide
IEC 62282-3-1, Fuel cell technologies – Part 3-1: Stationary fuel cell power systems – Safety
ISO 14121, Safety of machinery – Principles of risk assessment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
accessible (operator access area)
area to which, under normal operating conditions, one of the following applies:
– access can be gained without the use of a tool;
– the means of access are deliberately provided to the operator;
– the operator is instructed to enter regardless of whether or not a tool is needed to gain
access
NOTE The terms "access" and "accessible", unless qualified, relate to operator access area as defined above.
3.2
approved
acceptable to the authority having jurisdiction
3.3
authority having jurisdiction
AHJ
organization, office, or individual responsible for enforcing the requirements of a code or
standard, or for approving equipment, materials, an installation, or a procedure
3.4
exhaust
gases removed from a fuel cell power system and not reused

62282-3-3 © IEC:2007 – 9 –
3.5
exhaust system
gas-conveying system for moving gases from a source to a point of discharge
3.6
fire prevention
measures directed toward avoiding the inception of fire
3.7
fire protection
methods of providing for fire control or fire extinguishment
3.8
fire risk evaluation
detailed engineering review of a plant's construction features and operating process
conducted to ensure that applicable fire prevention and fire protection requirements for
safeguarding life and physical property are met
3.9
forced ventilation
flow of air or gas created by a fan, blower, or other mechanical means that will push or induce
the gas stream through a ventilation system
3.10
indoor installation
fuel cell power system completely surrounded and enclosed by walls, a roof, and a floor
3.11
installation
– location where a fuel cell power system is sited as a unit or built as an assembly
– act to install a fuel cell power system
3.12
large fuel cell power systems
fuel cell power systems having a net electrical output of more than 10 kW
3.13
lower flammable limit
LFL
lowest concentration of a flammable gas/vapour in air in which flame is propagated
3.14
natural ventilation
flow of air or gases created by the difference in the pressures or gas densities between the
outside and inside of a vent, room, or space
3.15
non-combustible
not capable of supporting combustion in accordance with ISO 1182 or equivalent method
3.16
outside or outdoor installation
power system installation that is not an indoor installation. When permitted by local or national
regulations, an open-air structure with partial roof and/or walls may be considered an outdoor
installation.
3.17
portable fuel cell power system
fuel cell power system which is intended to be moved while in operation and not fastened or
otherwise secured to a specific location
3.18
rooftop installation
power system installation located on the roof of a building

– 10 – 62282-3-3 © IEC:2007
3.19
room ventilation
air supply to the room for cooling, heating, makeup atmosphere, safety ventilation
NOTE This air can be taken from indoors or outdoors.
3.20
shall
indicates a mandatory requirement
3.21
should
indicates a recommendation or that which is advised but not required
3.22
small fuel cell power system
fuel cell power system having a net electrical output up to 10 kW
3.23
stationary
permanently connected and fixed in place
4 General safety requirements and strategy
The general safety strategy of this part of IEC 62282 is consistent with the safety strategy of
IEC 62282-3-1.
The standard is limited to those conditions that can lead to personnel hazards or damage to
equipment or property external to the fuel cell power system.
Based on the quantity of fuel and other stored energy (e.g. flammable materials, pressurized
media, electrical energy, mechanical energy, etc.) within the fuel cell power systems there is
a need to eliminate potential hazards. The general safety strategy for the installation of the
fuel cell power systems shall be established according to the following sequence:
– Avoid the possible release of combustible and/or toxic gases and pollutant gases, liquids
and solids.
– Eliminate hazards outside the fuel cell power system and the related installation, when
such energy or gases are released nearly instantaneously.
– Provide appropriate safety markings, concerning the remaining risks of hazards.
Using the techniques described above, special care shall be taken to address the following:
– Mechanical hazards - sharp surfaces, tripping hazards, moving masses and instability,
strength of materials, and liquids or gases under pressure.
– Electrical hazards - contact of persons with live parts, short circuits, high voltage.
– Thermal hazards - hot surfaces, release of high temperature liquids or gases, thermal
fatigue.
– Fire and explosion hazards - flammable gases or liquids, potential for explosive mixtures
during normal or abnormal operating conditions, potential for explosive mixtures during
fault conditions.
– Malfunction hazards - unsafe operation of installation related equipment due to failures of
software, control circuit or protective/safety components or incorrect manufacturing or
misoperation.
– Material and substance hazards - material deterioration, corrosion, embrittlement, toxic
releases, choking hazards (e.g. by superseding, replacing oxygen by inert purge gases).
– Waste disposal hazards - disposal of toxic materials, recycling, disposal of flammable
liquids or gases.
– Environmental hazards - unsafe operation in hot/cold environments, rain, flooding, wind,
earthquake, external fire, smoke.

62282-3-3 © IEC:2007 – 11 –
For large power systems, the preparation for installation process shall ensure that:
– all foreseeable hazards, hazardous situations and events associated with the fuel cell
power system Installation have been identified,
– the risk for each of these hazards has been estimated or derived from the combination of
probability of occurrence of the hazard and of its foreseeable severity. Guidance may be
found in ISO 14121, IEC 61882, or IEC 61511-3 as applicable, or equivalent,
– the probability and severity of each risk have been reduced as far as practicable,
– the necessary protection measures in relation to risks that cannot be eliminated have been
taken (provision of warning and safety devices).
A safety analysis for safety shutdown systems, that have otherwise not been evaluated or
certified by a third party, e. g. ancillary site equipment and interfaces to the approved fuel cell
power system, shall be performed.
5 Siting considerations
5.1 General siting
The fuel cell power system shall comply with IEC 62282-3-1.
A fuel cell power system(s) and associated equipment, components, and controls shall be
sited and installed in accordance with the manufacturer’s instructions and meet the following
requirements:
– It shall be placed and fixed firmly so that it will not be easily moved, toppled, or dislocated.
– It shall be located and secured as necessary so that the system and equipment will not be
adversely affected by wind, and seismic events. It shall be protected so as not to be
adversely affected by rain, snow, ice, water and or freezing temperatures, unless the
system and installation equipment is designed for those conditions.
– Sites for large power systems shall be protected against access by unauthorized persons
commensurate with the location and installation environment. Fire department access
shall be provided.
– It shall be located outside of potentially hazardous atmospheres as defined by IEC 60079-
10, unless listed and approved for the specific installation.
– It shall be sited so that the power system and equipment do not adversely affect building
exits.
– It shall be located so that the power system(s) and components of a fuel cell power
system and their respective vent or exhaust terminations are separated from doors,
windows, outdoor intakes, and other openings into a building to prevent introduction of
exhaust gases into the building.
– The exhaust outlet(s) shall not present a hazard when directed onto walkways or other
paths of travel for pedestrians.
– It shall be located in a manner that allows service, maintenance, and emergency access.
– It shall be located away from combustible materials, high-piled stock, and other exposures
to fire hazards. Distances and clearance shall be according to the manufacturer’s
installation instructions.
– It shall be located or protected to prevent physical damage from moving vehicles or
equipment.
– Multiple power systems shall be located or protected such that a fire or failure of one of
the systems does not present a safety hazard to adjacent power systems.
– Where demonstrated by an engineering analysis that the prescriptive requirements in this
clause are unnecessary to achieve an equivalent level of safety, approved alternatives
shall be permitted by the Authority Having Jurisdiction.
– Discharged liquids shall be disposed of according to AHJ.

– 12 – 62282-3-3 © IEC:2007
5.2 Outdoor installations
5.2.1 Air intakes to a fuel cell power system shall be located so that the plant is not
adversely affected by other exhausts, gases, or contaminants. Air intakes to a fuel cell power
system shall be kept unobstructed so their flow capacity is not affected by agglomeration of
solids, dust, water, ice and snow.
5.2.2 Air intakes and exhaust to and from a fuel cell power system shall not impact travel on
walkways or other paths of travel for pedestrians.
5.2.3 The exhaust outlet(s) from process areas or areas that contain fuel-bearing
components of a fuel cell power system including outlets from relief valves shall be located in
such a manner that it will not affect heating, ventilating, and air-conditioning (HVAC) air
intakes, windows, doors, and other openings into buildings.
5.2.4 The area around outlets from fuel processes or compartments that contain fuel-
bearing components and relief valves outlets shall be evaluated in accordance with
IEC 60079-10.
5.2.5 Security barriers, fences, landscaping, and other enclosures shall not affect the
required airflow into or exhaust out of the fuel cell power system and its components.
5.3 Indoor installations
5.3.1 Large fuel cell power systems
Indoor large fuel cell power systems and their associated components shall be installed in
rooms that meet the requirements of the applicable national standards.
5.3.2 Small fuel cell power systems
Small fuel cell power systems shall not be required to have fire rated separations.
5.4 Rooftop Installation
5.4.1 Fuel cell power systems and components located on rooftops shall be installed in
accordance with 5.2.
5.4.2 The material under and within 30 cm horizontally of a fuel cell power system or
component shall be non-combustible or shall be tested or certified to afford an appropriate
degree of fire protection to the roof deck. Exemption is made for fuel cell power systems
complying with IEC 62282-3-1, 5.13.b.
6 Ventilation and exhaust
6.1 General
6.1.1 All indoor fuel cell power system installations shall be provided with ventilation and
exhaust systems as noted below.
6.1.2 The ventilation systems for indoor installations shall be designed to provide a negative
or neutral pressure in the room with respect to the building, where the fuel cell power system
is located.
6.1.3 The intakes and exits of the ventilation and exhaust systems shall meet the
requirements specified in 5.2.1, 5.2.2 and 5.2.3.
6.2 Ventilation
The air that is supplied to the room where the fuel cell power system is located, whether taken
from the vicinity of the appliance, an adjacent room or outdoors, may serve as ventilation air,
process air or both. This air shall be supplied by either a forced ventilation system or natural
ventilation in accordance with the manufacturer’s installation instructions.
If forced ventilation is required for safety during normal operation, a control interlock shall be
provided to alarm and/or shutdown the fuel cell power system upon loss of ventilation
consistent with the safety analysis described in Clause 4.

62282-3-3 © IEC:2007 – 13 –
6.3 Exhaust System
6.3.1 Large fuel cell power systems shall have a dedicated exhaust system that routes the
emissions outdoors.
6.3.2 Small fuel cell power systems may exhaust directly into a utility shed, where they are
installed, if the shed
a) is unattached from a building or attached without direct access to the building’s occupied
areas, and
b) has an interlocked ventilation system that has sufficient flow to ensure, under all
circumstances, that it will prevent
1) higher concentrations of air free CO than 300 ppm,
2) values greater than 25 % of the relevant LFL, and
3) oxygen concentrations below 18 %.
6.4 Process purging and venting
6.4.1 Pressure tanks and piping intended to be purged, pressure regulators, relief valves,
and other potential sources of combustible gas shall be vented to the outside of the building
in accordance with 5.2.3. For small fuel cell power systems the purging is permitted into room
atmosphere, if it is ensured, that a maximum 25 % of the relevant LFL will not be exceeded
and that the atmosphere will not exceed 300 ppm of air-free CO anywhere in the room.
6.4.2 The vent shall be designed to prevent entry of water or foreign objects.
7 Fire protection and gas detection
7.1 Fire protection and detection
7.1.1 Site fire protection
7.1.1.1 If large fuel cell power systems are sited at locations that do not have hydrant
protection, such systems shall be protected in accordance with a fire risk evaluation.
Small fuel cell power systems are exempted from this requirement.
7.1.1.2 Fuel cell power systems located inside buildings shall be protected in accordance
with 7.1.2.
7.1.2 Combustible gas detection (indoor installations only)
7.1.2.1 A combustible gas detection system shall be installed in the fuel cell power system
enclosure or fuel cell power system exhaust system or in the room containing fuel cell power
system installations. Location of gas detection systems in the room shall be chosen to provide
the earliest warning of the combustible gases present.
Location of gas detectors shall be in accordance with IEC 61779-6.
The requirements for the gas sensors are defined in IEC 61779-4.
The combustible gas detection system is not required for small fuel cell power systems that
are:
• fuelled with odorized gas, or
• fuelled with non-odorized gas, such as hydrogen, from bottles of limited capacity
according to relevant national standards such that they can be stored indoors without
special ventilation.
7.1.2.2 The following criteria for combustible gas detection systems shall be met:
a) The combustible gas detection system shall be arranged to alarm at 25 % of the lower
flammable limit (LFL) and be interlocked to shut down the power system fuel supply at
60 % of LFL respectively.
– 14 – 62282-3-3 © IEC:2007
b) The LFL used shall be the lowest flammability limit of the gas or gas mixtures.
7.1.2.3 A combustible gas detector that meets the requirements of 7.1.2.2 shall be provided
for all indoor or separately enclosed gas compressors. Exempted are separately enclosed gas
compressors, provided room ventilation ensures combustible gas concentrations lower than
25 % of LFL.
7.1.2.4 The room or area where the fuel cell power system is installed shall have a
combustible gas detector located according 7.1.2.1 if non-odorized gas, such as hydrogen, is
piped into the room or area from outside. The gas detection system shall alarm and shutdown
according to the respective limits in 7.1.2.2.
7.2 Fire prevention and emergency planning
For large fuel cell installations, a written fire prevention and emergency plan shall be
provided. This is not required for small fuel cell power systems.
8 Interconnections with site interfaces
8.1 General
All interconnections including piping, electrical wiring, disconnects and ducting between site
interfaces and the fuel cell power system shall be in accordance to relevant national
standards.
8.2 Connections to fuel supplies – General
The installation and location of the interface point equipment downstream of the fuel supply
system and the associated fuel piping including the necessary components and their
connection to the stationary fuel cell power system shall be in accordance with this Clause.
8.3 Fuel shut off and piping
8.3.1 An accessible manual shutoff valve shall be located within 1,8 m upstream of the
fuel cell power system, unless the power system is enclosed by a fire rated room. In that
case, the shutoff valve shall be located outside the room.
8.3.2 A second shutoff valve may be located within the room for maintenance. If this
second valve is not provided, the shutoff, located outside the room, shall be a lockable type.
8.3.3 Piping, valves, regulators, or other equipment shall be located so that they are not
subject to physical damage.
8.3.4 For indoor installation of a power system being fed by non-odorized fuel gas
mixtures, an automatic shutoff valve interlocked with gas detection shall be located outside
the building that houses the power system in accordance with Clause 7. The gas detection
system shall be arranged to alarm at 25 % of LFL and be interlocked to shut down the power
system fuel supply at 60 % of LFL.
8.4 Connections to auxiliary media supply and media disposal
Different fuel cell power systems need some auxiliary media supply and disposal for example
normal operation, safety reasons, start-up or shutdown procedures, purging or protection
against internal damages. Water, nitrogen, carbon dioxide, hydrogen are typical auxiliary
media for fuel cell power systems. As storage of these media is not in the scope of this
standard, only the interfaces shall be defined.
8.4.1 Combustible auxiliary gases
Redundant safety systems consisting of a quick-action shut-off valve controlled by the fuel
cell power system’s automatic control system and an accessible second valve with an
additional manual operability in the feed line are required in each system for combustible
gases.
8.4.2 Non-combustible or inert auxiliary gases
Connections according to national standards.

62282-3-3 © IEC:2007 – 15 –
8.4.3 Water
Tap-water, recycled water: Connections according to national standards.
8.4.4 Waste water disposal
Connection according to national standards.
8.4.5 Discharge pipe
Connection according to national standards (not necessary for small fuel cell power systems).
9 Environmental requirements
Emissions, contaminants, and other environmental loads under normal operation, abnormal
and failure modes operation are defined in IEC 62282-3-1.
Requirements for installation and initial commissioning:
The following emissions during installation and initial commissioning shall not exceed levels
as limited by applicable national regulations
– Noise
– Toxic and/or pollutant emissions
– Discharge of construction materials
– Auxiliary materials
– Binder burn out gases
If required by national regulations adequate facilities to reduce emissions during installation
and commissioning of the fuel cell power system have to be provided and operated.
10 Approval tests
10.1 Gas leakage
A gas leakage test is required for site-installed piping only. The gas leakage test shall be
performed according to relevant national standards.
10.2 Site specific shutdown devices
Shutoff devices required by
– 6.2 (forced ventilation)
– 6.3 (forced exhaust)
– 7.1.2.1 and 7.1.2.4 (combustibility sensor)
– 8.3.4 (non-odorized gas shutoff valve)
shall be demonstrated to function properly.
11 Maintenance tests
Procedures shall be in place for maintenance tests of site-installed items as required for
normal periodic maintenance that will be performed according to the manufacturer’s
instructions and national regulations.
12 Documentation
12.1 Markings and instructions
User interface markings: Where user interfaces are located up to a fuel cell power system or
on a remote control unit connecting to the fuel cell power system, the input devices shall be
clearly identifiable in at least a local language. Any emergency devices shall be marked
according to the local or national regulations.

– 16 – 62282-3-3 © IEC:2007
All fuel piping covered by this standard shall be marked or identified in accordance with a
relevant national standard.
12.2 Inspection checklist
12.2.1 An inspection checklist shall be included within the documentation package or
contained within the installation manual. The inspection checklist shall be kept by the owner
or operator of the facility.
12.2.2 The installation checklist shall bear the following information:
– Installer’s company name
– Installer’s name
– Date of installation
– Location of fuel cell power system installation
12.2.3 The installation checklist shall include confirmation by signature of the installer of the
proper installation of the following:
– Fuel supply connection requirements as prescribed in 8.2
– Gas leakage test results as prescribed in 10.1
– Connections to auxiliary equipment as prescribed in 8.4
– Ventilation connections, construction, and testing of ventilation interlock as prescribed
in 6.2
– Exhaust connections, construction, and testing of exhaust interlock as prescribed in
6.3
– Electrical connections and grounding shall be as defined in national regulations
– External safety sensors as applicable in 7.1.2
– Process purge connections that are required by 6.4
12.3 Installation manual
The installation manual shall comply with IEC 62282-3-1. The installation manual shall be
supplied with the fuel cell power system and is written in the prevalent local language or
several languages to include the prevalent local language. The installation manual shall be
kept by the owner or operator of the facility.
12.4 User’s information manual
The user’s information manual shall comply with to IEC 62282-3-1. The user’s information
manual shall be supplied with the fuel cell power system and is written in the prevalent local
language or several languages to include the prevalent local language. The user’s information
manual shall be kept by the owner or operator of the facility.
12.5 Maintenance manual
12.5.1 The maintenance manual shall comply with IEC 62282-3-1. The maintenance
manual shall be supplied with the fuel cell power system and is written in the prevalent local
language or several languages to include the prevalent local language. The maintenance
manual shall be kept by the owner or operator of the facility.
12.5.2 The maintenance manual shall be augmented with maintenance information, in
particular on site specific equipment.

___________
– 18 – 62282-3-3 © CEI:2007
SOMMAIRE
AVANT-PROPOS.20
INTRODUCTION.22

1 Domaine d'applicaton .23
2 Références normatives.24
3 Termes et définitions .24
4 Exigences et stratégie générales de sécurité.26
5 Considérations relatives à l’implantation.27
5.1 Implantation générale.27
5.2 Installations extérieures .28
5.3 Installations intérieures .29
5.3.1 Systèmes à piles à combustible de grande taille.29
5.3.2 Systèmes à piles à combustible de petite taille .29
5.4 Installation sur toit.29
6 Ventilation et évacuation .29
6.1 Généralités.29
6.2 Ventilation .29
6.3 Système d’évacuation .29
6.4 Purge et ventilation du traitement .30
7 Protection contre les incendies et détection de gaz .30
7.1 Protection contre les incendies et détection.30
7.1.1 Protection contre les incendies sur site.
...