IEC 62282-5-1:2012

IEC 62282-5-1 ®
Edition 2.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fuel cell technologies –
Part 5-1: Portable fuel cell power systems – Safety

Technologies des piles à combustible –
Partie 5-1: Systèmes à piles à combustible portables – Sécurité

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IEC 62282-5-1 ®
Edition 2.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fuel cell technologies –
Part 5-1: Portable fuel cell power systems – Safety

Technologies des piles à combustible –

Partie 5-1: Systèmes à piles à combustible portables – Sécurité

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.070 ISBN 978-2-8322-5057-0

– 2 – IEC 62282-5-1:2012 © IEC 2012
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 8
3 Terms and definitions . 11
4 Design and construction requirements . 16
4.1 Physical environment and operating conditions . 16
4.2 Material compatibility . 16
4.3 Protection against mechanical hazards . 17
4.4 Protection against toxicity of fuels and fuel feedstocks . 18
4.5 Protection against explosion hazards . 18
4.6 Protection against electric shock . 19
4.7 Selection of electrical components and equipment . 21
4.8 Protection against fire hazard . 24
4.9 Protection against temperature hazards . 26
4.10 Protection against electromagnetic disturbances . 26
4.11 Hazard and risk assessment . 27
4.12 Safety control circuits . 27
4.13 Protection against oxygen depletion . 27
4.14 Emission of effluents . 28
4.15 Fuel supply . 28
4.16 Fuel processing systems . 29
4.17 Enclosures . 29
4.18 Battery supplies. 29
4.19 Pressure vessels and piping . 30
4.20 Hoses . 31
4.21 Automatic shut-off valves . 31
4.22 Regulators . 31
4.23 Process control equipment . 32
4.24 Filters . 32
4.25 Motors . 32
4.26 Fuel pumps . 32
5 Instructions . 32
5.1 Operation and maintenance manual . 32
5.2 User's information manual . 34
6 Labelling . 36
6.1 General labelling requirements . 36
6.2 Marking . 36
6.3 Warnings . 37
7 Type tests . 38
7.1 General requirements for type tests . 38
7.2 Test sequence . 38
7.3 Leakage test for liquid fuelled systems . 38
7.4 Flammable fuel gas concentration test . 39
7.5 Surface temperatures . 39
7.6 Component temperatures . 39
7.7 Wall, floor and ceiling temperatures. 40

7.8 Dielectric strength . 40
7.9 Humidity test . 40
7.10 Leakage current at operating temperature . 41
7.11 Abnormal operation testing . 41
7.12 Strain relief testing . 42
7.13 Insulating material . 42
7.14 Earthing test . 42
7.15 Tank pressure test. 42
7.16 Stability . 43
7.17 Impact test . 43
7.18 Free drop test . 44
7.19 Adhesion and legibility of marking materials . 45
7.20 Flammable gas accumulation . 45
7.21 Oxygen depletion test . 46
7.22 Emission of effluents tests . 47
7.23 Alternative carbon dioxide emission test . 52
7.24 Wind test . 53
7.25 Strength test. 54
7.26 Stress relief test . 55
7.27 Fuel supply securement test . 55
7.28 Shut-down parameters . 55
7.29 Non-metallic tubing conductivity test . 56
7.30 Non-metallic tubing test for accumulation of static electricity . 56
8 Routine tests . 57
8.1 Routine test requirements . 57
8.2 Gas leakage test . 57
8.3 Liquid leakage test . 57
8.4 Dielectric strength test . 57
8.5 Routine test records . 57
Annex A (normative) Ventilation rates for batteries . 58
Annex B (informative) Shock and vibration limits for high shock environments . 59
Annex C (normative) Uncertainty of measurements . 61
Bibliography . 62

Figure 1 – Portable fuel cell power systems . 7
Figure 2 – Articulated probe . 45
Figure 3 – Operational emission rate testing apparatus . 48

Table 1 – Emission limits . 51
Table 2 – Occupational exposure limits . 52
Table B.1 – Vertical axis vibration conditions . 59
Table B.2 – Longitudinal and lateral axes vibration conditions . 60
Table C.1 – Measurements and their maximum uncertainties . 61

– 4 – IEC 62282-5-1:2012 © IEC 2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FUEL CELL TECHNOLOGIES –
Part 5-1: Portable fuel cell power systems – Safety

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 62282-5-1 has been prepared by IEC technical committee 105:
Fuel cell technologies.
This bilingual version (2018-08) corresponds to the monolingual English version, published in
2012-09.
This second edition cancels and replaces the first edition, published in 2007, and constitutes
a technical revision.
The major technical changes with respect to the first edition are as follows:
• IEC normative references and definitions have been updated (e.g., hazardous locations,
micro fuel cell power systems, transportable equipment, etc.);
• subclause 4.2.2 has been updated referencing an alternative test method in response to a
comment;
• the limit on flammable atmospheres has been reduced from 50 % of LFL to 25 % of LFL in
4.5.4 and in 7.20;
• subclause 4.14 and the corresponding tests in 7.22 have been updated to include more
effluents and criteria to establish if a system is suitable for indoor or outdoor operation;
• specific criteria for oxygen detector sensor performance requirements have been revised
in 7.21;
• subclause 7.18 has been updated with a new test method and new drop heights in
response to comments;
• Table 1 has been added giving limits on emission of effluents using limits drawn from the
micro fuel cell power system standard.
The text of this standard is based on the following documents:
FDIS Report on voting
105/396/FDIS 105/404/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62282 series, published 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 stability 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 – IEC 62282-5-1:2012 © IEC 2012
FUEL CELL TECHNOLOGIES –
Part 5-1: Portable fuel cell power systems – Safety

1 Scope
This part of IEC 62282 covers construction, marking and test requirements for portable fuel
cell power systems. These fuel cell systems are movable and not fastened or otherwise
secured to a specific location. The purpose of the portable fuel cell power system is to
produce electrical power.
This standard applies to a.c. and d.c. type portable fuel cell power systems, with a rated
output voltage not exceeding 600 V a.c., or 850 V d.c. for indoor and outdoor use. These
portable fuel cell power systems are not to be used in hazardous locations as defined by
IEV 426-03-01 unless additional protective measures are added in accordance with
IEC 60079-0.
This standard does not apply to portable fuel cell power systems that are
a) permanently connected (hard wired) to the electrical distribution system,
b) permanently connected to a utility fuel distribution system,
c) exporting power to the grid,
d) for propulsion of road vehicles,
e) intended to be used on board passenger aircraft.
Fuel cells that provide battery charging for hybrid vehicles where the battery provides power
and energy for propulsion of the vehicle are not included in the scope of this standard
The following fuels and fuel feedstocks are considered within the scope of this standard:
• natural gas;
• liquefied petroleum gas, such as propane and butane;
• liquid alcohols, for example methanol, ethanol;
• gasoline;
• diesel;
• kerosene;
• hydrogen;
• metals (e.g. Mg, Al or Zn) or metal alloys immersed in electrolyte (e.g. aqueous solutions
of salts or alkali) in air or oxygen;
• chemical hydrides.
This standard does not preclude the use of similar fuels or oxidants from sources other than
air provided the unique hazards are addressed through additional requirements.

Power inputs
Cabinet
electrical thermal
Thermal
management
system
Waste heat
Fuel
Fuel supply
processing
system
system
Power
Fuel
conditioning
cell
system
module Useable power
Oxidant
electrical
Oxidant processing
system
Water
Internal power
treatment
Discharge
needs
system
Ventilation water
Inert gas
Ventilation
Exhaust gases,
Onboard
Water Automatic
system
ventilation
energy
control
storage
system
1 2
EMD EMI
Vibration, Noise,
wind, rain,
vibration
temperature
etc.
IEC  285/07
Key
1 EMD electromagnetic disturbance
2 EMI electromagnetic interference
Figure 1 – Portable fuel cell power systems
The overall design of a portable fuel cell power system anticipated by this standard shall form
an assembly of some or all of the following systems (see Figure 1), integrated as necessary,
to perform designated functions, as follows:
Fuel processing system – chemical processing equipment including any associated heat
exchangers and controls required to convert input fuel to a composition suitable for the fuel
cell stack.
Oxidant processing system – subsystem that meters, conditions, processes and may
pressurize the incoming oxidant supply for use within the fuel cell power system.
Thermal management system – subsystem intended to provide cooling and heat rejection in
order to maintain thermal equilibrium within the fuel cell power system, and, if necessary, to
provide for the recovery and utilization of excess heat and to assist in heating the fuel cell
power systems during start-up.
Power conditioning system – equipment which is used to change the magnitude or
waveform of the voltage, or otherwise alter or regulate the output of a power source.
Automatic control system – assembly of sensors, actuators, valves, switches and logic
components (including process controllers) that maintains the fuel cell power system
parameters within the manufacturer’s specified limits without manual intervention.
Fuel cell module – assembly, including a fuel cell stack(s), which electrochemically converts
chemical energy to electric energy and thermal energy intended to be integrated into a power
generation system.
– 8 – IEC 62282-5-1:2012 © IEC 2012
Fuel supply system – either integral to the portable fuel cell power system or supplied
through a removable and refillable container assembly.
Onboard energy storage system – an internal energy source intended to aid or complement
the fuel cell module in providing power to internal or external loads.
Ventilation systems – subsystem of the fuel cell power system that provides, by mechanical
means, air to its cabinet.
Water treatment systems – provides for treatment and purification of recovered or added
water for use within the portable fuel cell power system.
These requirements are not intended to prevent the design and construction of a portable fuel
cell power system not specifically described in this standard, provided that such alternatives
have been considered and equivalent testing yields equivalent safety performance to that
prescribed by this standard. In considering alternative designs or construction, this standard
may be used to evaluate the alternative materials or methods to be used as to their ability to
yield equivalent performance to that prescribed by this standard.
This standard does not cover requirements of pressurized or non-pressurized fuel supply
containers upstream of the appliance gaseous or liquid fuel supply connector that are not
integral to the portable fuel cell power system.
All pressures in this standard are considered to be gauge pressures, unless otherwise
specified.
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 60034 (all parts), Rotating electrical machines
IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
IEC 60079-2, Explosive atmospheres – Part 2: Equipment protection by pressurized
enclosures "p"
IEC 60079-10, Explosive atmospheres (all Parts 10) – Part 10: Classification of areas
IEC 60079-15, Explosive atmospheres – Part 15: Equipment protection by type of protection
"n"
IEC 60079-20-1, Explosive atmospheres – Part 20-1: Material characteristics for gas and
vapour classification – Test methods and data
IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance
requirements of detectors for flammable gases
IEC 60086-4, Primary batteries – Part 4: Safety of lithium batteries

IEC 60204-1:2005, Safety of machinery – Electrical equipment of machines – Part 1: General
requirements
IEC 60216-4-1, Electrical insulating materials – Thermal endurance properties – Part 4-1:
Ageing ovens –Single-chamber ovens
IEC 60335-1:2010, Household and similar electrical appliances – Safety – Part 1: General
requirements
IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-2-11, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products
IEC 60695-2-13, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –
Apparatus, confirmatory test arrangement and guidance
IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical
flame test methods
IEC 60695-11-20, Fire hazard testing – Part 11-20: Test flames – 500 W flame test methods
IEC 60730-1:2010, Automatic electrical controls for household and similar use – Part 1:
General requirements
IEC 60730-2-5, Automatic electrical controls for household and similar use – Part 2-5:
Particular requirements for automatic electrical burner control
IEC 60730-2-17, Automatic electrical controls for household and similar use – Part 2-17:
Particular requirements for electrically operated gas valves, including mechanical
requirements
IEC 60812, Analysis techniques for system reliability – Procedure for failure mode and effects
analysis (FMEA)
IEC 60884-1, Plugs and socket-outlets for household and similar purposes – Part 1: General
requirements
IEC 60934, Circuit-breakers for equipment (CBE)
IEC 60950-1:2005, Information technology equipment – Safety – Part 1: General requirements
IEC 60990:1999, Methods of measurement of touch current and protective conductor current
IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic
currents emissions (equipment input current ≤ 16 A per phase)

– 10 – IEC 62282-5-1:2012 © IEC 2012
IEC 61000-3-3, Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage
changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment
with rated current ≤16 A per phase and not subject to conditional connection
IEC 61000-6-1, Electromagnetic compatibility (EMC) – Part 6-1: Generic standards –
Immunity for residential, commercial and light-industrial environments
IEC 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity standards – Immunity for industrial environments
IEC 61000-6-3, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards –
Emission standard for residential, commercial and light-industrial environments
IEC 61000-6-4, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards –
Emission standard for industrial environments
IEC 61025, Fault tree analysis (FTA)
IEC 61032, Protection of persons and equipment by enclosures – Probes for verification
IEC 61140, Protection against electric shock – Common aspects for installation and
equipment
IEC 61439-1, Low-voltage switchgear and controlgear assemblies – Part 1: General rules
IEC 61508-1, Functional safety of electrical/electronic/programmable electronic safety-related
systems – Part 1: General requirements
IEC 61511-1, Functional safety – Safety instrumented systems for the process industry sector
– Part 1: Framework, definitions, system, hardware and software requirements
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 61882, Hazard and operability studies (HAZOP studies) – Application guide
IEC 62040-1, Uninterruptible power systems (UPS) – Part 1: General and safety requirements
for UPS
IEC 62040-2, Uninterruptible power systems (UPS) – Part 2: Electromagnetic compatibility
(EMC) requirements
IEC 62133, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Safety requirements for portable sealed secondary cells, and for batteries made from them,
for use in portable applications
IEC 62282-2, Fuel cell technologies – Part 2: Fuel cell modules
ISO 3864 (all parts), Graphical symbols – Safety colours and safety signs
ISO 4080, Rubber and plastics hoses and hose assemblies – Determination of permeability to
gas
ISO 7000, Graphical symbols for use on equipment – Index and synopsis
ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs

ISO 15649, Petroleum and natural gas industries – Piping
ISO 16000-3, Indoor air – Part 3: Determination of formaldehyde and other carbonyl
compounds – Active sampling method
ISO 16000-6, Indoor air – Part 6: Determination of volatile organic compounds in indoor and
test chamber air by active sampling on Tenax TA® sorbent, thermal desorption and gas
chromatography using MS or MS-FID
ISO 16017-1:2007, Indoor, ambient and workplace air – Sampling and analysis of volatile
organic compounds by sorbent tube/thermal desorption/capillary gas chromatography –
Part 1: Pumped sampling
ISO 16110-1:2007, Hydrogen generators using fuel processing technologies – Part 1: Safety
ISO 16111, Transportable gas storage devices – Hydrogen absorbed in reversible metal
hydride
ISO 16528, Boilers and pressure vessels – Registration of Codes and Standards to promote
international recognition
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
basic insulation
insulation of hazardous-live-parts which provides basic protection
[SOURCE: IEC 60050-195:1998, definition 195-06-06, modified – Note not included] [1]
3.2
double insulation
insulation comprising both basic insulation and supplementary insulation
[SOURCE: IEC 60050-195:1998, definition 195-06-08]
3.3
electromagnetic interference
EMI
degradation of the performance of an equipment, transmission channel or system caused by
an electromagnetic disturbance
[SOURCE: IEC 60050-161:1990, definition 161-01-06, modified – Notes not included] [2]
3.4
electromagnetic disturbance
EMD
any electromagnetic phenomenon which may degrade the performance of a device,
equipment or system, or adversely affect living or inert matter
[SOURCE: IEC 60050-161:1990, definition 161-01-05, modified – Notes not included]
___________
References in square brackets refer to the Bibliography.

– 12 – IEC 62282-5-1:2012 © IEC 2012
3.5
enclosure
housing affording the type and degree of protection suitable for the intended application
[SOURCE: IEC 60050-195:1998, definition 195-02-35]
Note 1 to entry: One type of enclosure can be inside another type (e.g. an electrical enclosure inside a fire
enclosure or a fire enclosure inside an electrical enclosure). Also, a single enclosure can provide the functions of
more than one type (e.g. those of both an electrical enclosure and a fire enclosure). Enclosures may be electrical,
mechanical, fire or another type of enclosures to provide protection from these hazards or from wind, weather and
other hazards.
3.6
electrical enclosure
enclosure providing protection against the foreseen dangers created by electricity
[SOURCE: IEC 60050-195:1998, definition 195-06-13]
3.7
fire enclosure
part of the equipment intended to minimize the spread of fire or flames from within
3.8
mechanical enclosure
part of the equipment intended to reduce the risk of injury due to mechanical and other
physical hazards
3.9
hazardous location
any area or space where combustible dust, ignitable fibres, or flammables, volatile liquids,
gases, vapours or mixtures are or may be present in the air in quantities sufficient to produce
an explosive atmosphere or ignitable mixtures
3.10
explosive atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of gas,
vapour, dust, fibres, or flyings which, after ignition, permits self-sustaining propagation
[SOURCE: IEC 60050-426:2008, definition 426-01-06] [3]
3.11
hazardous energy level
available power level of 240 VA or more, having a duration of 60 s or more, or a stored energy
level of 20 J or more (for example, from one or more capacitors), at a potential of 2 V or more
[SOURCE: IEC 60950-1:2005, definition 1.2.8.10]
3.12
hazardous voltage
voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the
requirements for either a limited current circuit or a TNV circuit
[SOURCE: IEC 60950-1:2005, definition 1.2.8.6]
3.13
heat deflection temperature
HDT
measure of a polymer’s resistance to distortion under a given load at elevated temperatures
Note 1 to entry: The deflection temperature is the temperature at which a test bar, loaded to the specified bending
stress, deflects by 0,25 mm.
3.14
limited current circuit
circuit that is so designed and protected that, under both normal operating conditions and
single fault conditions, the current that can be drawn is not hazardous
Note 1 to entry: The limit values of currents under normal operating conditions and single fault conditions (see
1.4.14 of IEC 60950-1:2005) are specified in 2.4 of IEC 60950-1:2005.
[SOURCE: IEC 60950-1:2005, definition 1.2.8.9]
3.15
live part
conductor or conductive part intended to be energized in normal operation, including a neutral
conductor, but by convention not a PEN conductor or PEM conductor or PEL conductor
Note 1 to entry: This concept does not necessarily imply a risk of electric shock.
[SOURCE: IEC 60050-195:1998, definition 195-02-19]
3.16
maximum allowable working pressure
MAWP
maximum pressure at which a fuel cell or fuel cell power system may be operated
Note 1 to entry: The maximum allowable working pressure is expressed in Pa.
Note 2 to entry: The maximum allowable working pressure is the pressure used in determining the setting of
pressure limiting and relieving devices installed to protect a component or system from accidental over-pressuring.
Note 3 to entry: For the purpose of this standard, all pressures are to be given and used as gauge pressures
unless absolute pressure is indicated.
3.17
maximum operating pressure
maximum pressure, specified in gauge pressure by the manufacturer, of a component or
system at which it is designed to operate continuously
Note 1 to entry: The maximum operating pressure is expressed in Pa.
Note 2 to entry: This includes all normal operation, both steady state and transient.
3.18
operator access area
area for which under normal operating conditions
a) access is gained without the use of a tool; or
b) the means of access is deliberately provided to the operator; or
c) the operator is instructed to enter regardless of whether or not tools are needed to gain
access
Note 1 to entry: In this standard, the terms "access" and "accessible", unless qualified, relate to operator access
as defined above.
3.19
portable fuel cell power system(s)
fuel cell power system that is not intended to be permanently fastened or otherwise secured in
a specific location
3.20
portable stand-alone fuel cell power system
portable fuel cell power system that is not designed to be connected to the energized mains

– 14 – IEC 62282-5-1:2012 © IEC 2012
3.21
reinforced insulation
insulation of hazardous-live-parts which provides a degree of protection against electric shock
equivalent to double insulation
Note 1 to entry: Reinforced insulation may comprise several layers which cannot be tested singly as basic
insulation or supplementary insulation.
[SOURCE: IEC 60050-195:1998, definition 195-06-09]
3.22
secondary circuit
circuit that has no direct connection to a primary circuit and derives its power from a
transformer, converter or equivalent isolation device, or from a battery
Note 1 to entry: Conductive parts of an interconnecting cable may be part of a secondary circuit as stated in
1.2.11.6 of IEC 60950-1:2005.
[SOURCE: IEC 60950-1:2005, definition 1.2.8.5]
3.23
SELV
Safety Extra Low Voltage
a) for a.c. the peak value of the voltage does not exceed 42,4 V;
b) for d.c. the voltage does not exceed 60 V
Note 1 to entry: When safety extra low voltage is obtained from the supply mains, it is to be through a safety
isolating transformer or a converter with separate windings, the insulation of which complies with double insulation
or reinforced insulation requirements.
Note 2 to entry: The voltage limits specified are based on the assumption that the safety isolating transformer is
supplied at its rated voltage.
Note 3 to entry: Safety Extra Low Voltage is also known as SELV.
[SOURCE: IEC 60335-1:2010, definition 3.4.2, modified]
3.24
SELV circuit
Safety Extra Low Voltage Circuit
secondary circuit that is so designed and protected that under normal operating conditions
and single fault conditions, its voltages do not exceed a safe value
Note 1 to entry: For commercial, industrial and telecommunication applications, the SELV voltage limits provided
in IEC 60950-1:2005 are applicable. For household applications, the SELV voltage limits in IEC 60335-1:2010 shall
be used.
Note 2 to entry: The limit values of voltages under normal operating conditions and single fault conditions (see
1.4.14 of IEC 60950-1:2005) are specified in 2.2 of IEC 60950-1:2005. See Table 1A of IEC 60950-1:2005.
Note 3 to entry: This definition of a SELV Circuit differs from the term "SELV system" as used in IEC 61140.
[SOURCE: IEC 60950-1:2005, definition 1.2.8.8, modified]
3.25
service personnel
trained persons having familiarity and experience with the construction and operation of the
system and the risks involved
3.26
supplementary insulation
independent insulation applied in addition to ba
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