EN IEC 63437:2026

SLOVENSKI STANDARD
01-marec-2026
Hladilni aparati za delovanje izven omrežja in pri nezanesljivem omrežju za
domačo in lahkotno komercialno uporabo - Značilnosti in preskusne metode -
Zahtevane lastnosti in poraba energije
Off grid and unreliable grid refrigerating appliances for domestic and light commercial
use - Characteristics and test methods - Performance requirements and energy
consumption
Netzunabhängig und mit unzureichendem Netz betriebene Kühlgeräte für den
Hausgebrauch und für den einfachen gewerblichen Gebrauch - Eigenschaften und
Prüfverfahren – Leistungsanforderungen und Energieverbrauch
Appareils de réfrigération hors réseau et sur réseau peu fiable pour un usage
domestique et commercial léger - Caractéristiques et méthodes d'essai - Exigences
d'aptitude à la fonction et consommation d'énergie
Ta slovenski standard je istoveten z: EN IEC 63437:2026
ICS:
97.040.30 Hladilni aparati za dom Domestic refrigerating
appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 63437

NORME EUROPÉENNE
EUROPÄISCHE NORM January 2026
ICS 97.030
English Version
Off grid and unreliable grid refrigerating appliances for domestic
and light commercial use - Characteristics and test methods -
Performance requirements and energy consumption
(IEC 63437:2025)
Appareils de réfrigération hors réseau et sur réseau peu Netzunabhängig und mit unzureichendem Netz betriebene
fiable pour un usage domestique et commercial léger - Kühlgeräte für den Hausgebrauch und für den einfachen
Caractéristiques et méthodes d'essai - Exigences d'aptitude gewerblichen Gebrauch - Eigenschaften und Prüfverfahren
à la fonction et consommation d'énergie - Leistungsanforderungen und Energieverbrauch
(IEC 63437:2025) (IEC 63437:2025)
This European Standard was approved by CENELEC on 2025-12-26. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63437:2026 E
European foreword
The text of document 59M/193/FDIS, future edition 1 of IEC 63437, prepared by SC 59M
"Performance of electrical household and similar cooling and freezing appliances" of IEC/TC 59
"Performance of household and similar electrical appliances" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 63437:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-01-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-01-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63437:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60335-2-24 NOTE Approved as EN IEC 60335-2-24
IEC 62124 NOTE Approved as EN 62124
IEC 62552-1 NOTE Approved as EN 62552-1
IEC 62552-2 NOTE Approved as EN 62552-2
ISO 22044:2021 NOTE Approved as EN ISO 22044:2022 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
ISO 7000 2019 Graphical symbols for use on equipment - - -
Registered symbols
IEC 63437 ®
Edition 1.0 2025-11
INTERNATIONAL
STANDARD
Off grid and unreliable grid refrigerating appliances for domestic and light
commercial use - Characteristics and test methods - Performance requirements
and energy consumption
ICS 97.030  ISBN 978-2-8327-0880-4

IEC 63437:2025-11(en)
IEC 63437:2025 © IEC 2025
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
3.1 General . 10
3.2 Unreliable grid supply . 11
3.3 Off grid supply . 12
3.4 Technical . 13
3.5 Compartments . 13
3.6 Performance characteristics . 15
4 Categorization of refrigerating appliances in scope . 16
5 Compartment storage temperature specifications . 17
5.1 General . 17
5.2 Calculation of T , T and T for refrigerating appliances with a
c_min c_max cm
vertical door . 18
5.3 Calculation of T , T and T for refrigerating appliances with a
c_min c_max cm
horizontal door or lid . 19
6 Instruments, accuracy and precision of measurements . 20
6.1 General . 20
6.2 Electrical energy consumption. 20
6.3 Humidity . 20
6.4 Length . 20
6.5 Mass . 20
6.6 Temperature . 21
6.7 Time . 21
6.8 Voltage and frequency . 21
6.9 Maximum current . 21
6.10 DC power supply . 21
7 General test conditions. 21
7.1 General . 21
7.2 Ambient temperatures . 22
7.2.1 Sensors . 22
7.2.2 Temperature stability . 22
7.2.3 Climate classes . 22
7.3 Ambient relative humidity . 23
7.4 Test room configuration . 23
7.4.1 Platform . 23
7.4.2 Rear wall or partition . 23
7.4.3 Side partitions . 23
7.4.4 Sensor location . 24
7.4.5 Test room general configuration . 24
7.5 Electricity supply . 25
7.5.1 General. 25
7.5.2 AC supply unreliable grid . 26
7.5.3 DC supply off grid . 29
IEC 63437:2025 © IEC 2025
7.5.4 AC/DC supply for hybrid refrigerating appliances . 32
8 Preparation of an appliance for testing and general procedures . 32
8.1 General . 32
8.2 Running in of new appliances . 32
8.3 Installation of the appliance in the test room . 32
8.3.1 General. 32
8.3.2 Rear clearance . 32
8.4 Setting up . 32
8.4.1 General. 32
8.5 Variable temperature compartment . 33
8.6 Pre-test condition . 33
8.6.1 General. 33
8.6.2 Refrigerating appliances without an electrical battery to supply the
compressor . 33
8.6.3 Off grid battery supported solar refrigerating appliances . 36
9 Location of compartment temperature sensors . 38
9.1 General . 38
9.2 Overview . 38
9.3 Compartment with a vertical door . 38
9.4 Compartment with a horizontal door or lid . 39
10 Volume . 41
10.1 General . 41
10.2 Test procedure . 42
10.2.1 Volume measurements . 42
10.2.2 Determination of volume . 42
10.2.3 Volume of evaporator space . 42
11 Maximum current test . 43
11.1 General . 43
11.2 Test procedure . 43
12 Pull down test . 44
12.1 General . 44
12.2 Test procedure . 44
12.3 Data to record and report . 45
13 Water cooling test . 45
13.1 General . 45
13.2 Load . 45
13.3 Test procedure . 47
13.4 Data to record and report . 48
14 Water freezing test . 48
14.1 General . 48
14.2 Load . 48
14.3 Test procedure . 50
14.4 Data to record and report . 50
15 Energy consumption test . 50
15.1 General . 50
15.2 Test procedure . 51
15.3 Data to record and report . 51
IEC 63437:2025 © IEC 2025
16 High ambient storage and energy consumption test (only valid for ST and T
appliances) . 52
16.1 General . 52
16.2 Test procedure . 52
16.3 Data to record and report . 52
17 Low ambient storage test . 52
17.1 General . 52
17.2 Test procedure . 52
17.3 Data to record and report . 53
18 Holdover test . 53
18.1 General . 53
18.2 Test procedure: . 53
18.3 Data to record and report . 54
19 Solar class test . 54
19.1 General . 54
19.2 Test procedure . 54
19.3 Data to record and report . 55
20 Under and over voltage test . 55
20.1 General . 55
20.2 Test procedure . 55
20.3 Data to record and report for the under and for the over voltage test . 56
21 Voltage withstand test . 56
21.1 General . 56
21.2 Test procedure . 57
21.3 Data to record and report . 57
22 Polarity check test . 57
22.1 General . 57
22.2 Test procedure . 57
22.3 Data to record and report . 57
23 Summary of compartment load, electrical battery state and thermal store
conditions . 57
24 Marking . 58
24.1 Rating plate information . 58
24.2 Identification of frozen compartments . 59
24.3 Load limit lines . 59
Annex A (informative) Background information and arguments for the standard . 61
A.1 Background . 61
A.2 Rationale . 62
Annex B (informative) Test points solar classes . 63
Annex C (informative) Recommendations for future standard updates . 66
Bibliography . 67

Figure 1 – Example calculation of T and T for refrigerating appliances with
c_min c_max
a vertical door . 19
Figure 2 – Example calculation of T and T for refrigerating appliances with
c_min c_max
a horizontal door or lid . 20
Figure 3 – Verification of parameters to be kept constant . 22
IEC 63437:2025 © IEC 2025
Figure 4 – Partitions to restrict air circulation and ambient temperatures sensor
positions . 25
Figure 5 – AC supply signals . 28
Figure 6 – Daily solar class supply signals . 30
Figure 7 – Daily functional supply signal . 31
Figure 8 – Pre-test condition A – Example 1: applying an intermittent supply class 4
supply signal . 34
Figure 9 – Pre-test condition A– Example 2: applying an intermittent supply class 5
supply signal . 34
Figure 10 – Pre-test condition B for holdover test – Example 1 . 35
Figure 11 – Pre-test condition B for holdover test – Example 2 . 35
Figure 12 – Pre-test condition C – Example 1: applying an intermittent supply class 4
supply signal . 36
Figure 13 – Pre-test condition C – Example 2: applying an intermittent supply class 5
supply signal . 37
Figure 14 – Pre-test condition D for holdover test – Example 1. 37
Figure 15 – Pre-test condition D for holdover test – Example 2. 38
Figure 16 – Location of temperature sensors vertical door refrigerating appliances . 39
Figure 17 – Location of temperature sensors horizontal door or lid refrigerating
appliances . 41
Figure 18 – Basic view of top mounted freezer appliance . 43
Figure 19 – Load and position of the water and M-containers on each shelf for
appliances with a vertical door and on the dummy shelf for horizontal appliances with a
dummy shelf (water cooling test) . 46
Figure 20 – Load and position of the M-containers on the shelve (water freezing test) . 49
Figure 21 – Star identification symbols for frozen compartments . 59
Figure 22 – Marking of load limit . 60

Table 1 – Unreliable grid refrigerating appliance categories and their configuration
codes . 17
Table 2 – Off grid refrigerating appliance categories and their configuration codes . 17
Table 3 – Compartment temperature specification. 18
Table 4 – Climate classes . 22
Table 5 – Ambient test conditions. 23
Table 6 – AC unreliable grid supply signals . 27
Table 7 – Intermittent AC voltage supply class . 27
Table 8 – AC voltage distorted supply class . 28
Table 9 – AC voltage withstand supply class . 29
Table 10 – DC off grid supply signals . 29
Table 11 – Current of the functional supply . 30
Table 12 – Functional supply signal . 31
Table 13 – Intermittent DC voltage supply class. 32
Table 14 – Testing days energy consumption test . 51
Table 15 – Testing days solar class test . 55
Table 16 – Compartment load, electrical battery condition and thermal store state at
the start of each test . 58
Table B.1 – Coordinates of the irradiance graphs for the various solar classes . 64

IEC 63437:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Off grid and unreliable grid refrigerating appliances for domestic and light
commercial use - Characteristics and test methods - Performance
requirements and energy consumption

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
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63437 has been prepared by subcommittee 59M: Performance of electrical household and
similar cooling and freezing appliances, of IEC technical committee 59: Performance of
household and similar electrical appliances. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
59M/193/FDIS 59M/195/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
IEC 63437:2025 © IEC 2025
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The following print types are used:
– requirements: in roman type;
– notes: in small roman type;
– words in bold are defined in Clause 3.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 63437:2025 © IEC 2025
INTRODUCTION
Background information and arguments for this document are provided in Annex A. Annex C
provides recommendations for future updates of this document.

IEC 63437:2025 © IEC 2025
1 Scope
This document specifies the essential characteristics of off grid and unreliable grid
refrigerating appliances for domestic and similar use or light commercial use, cooled by
internal natural or forced air convection. It defines input voltage supply signals for appliances
designed for unreliable grid and off grid conditions.
An unreliable grid condition can be the result of disturbances on the electricity supply, such
as power outages, or issues with power quality, such as voltage spikes and surges, that could
cause performance challenges to refrigerating appliances. An off grid supply, in this context,
for example is generated by a solar panel or a stand-alone solar home system that is not
connected to the power grid. This document simulates the power characteristics in off grid and
unreliable grid conditions but does not specify requirements or test procedures to assess
performance of generators, solar panels, solar home system or any other system generating a
supply signal.
The supply signals defined in this document can also be used for evaluation of the performance
of other refrigerating appliances such as medical or laboratory appliances, professional
storage refrigerators or freezers, refrigerated display cabinets, beverage coolers or ice cream
freezers.
This document specifies the test methods for measuring the functional performance
characteristics and requirements. This document does not apply to refrigerating appliances
designed for a good quality and stable electricity grid and refrigerating appliances utilising
fuelled absorption cooling technology.
This document is applicable to any refrigerating appliance for domestic or light commercial
use that has a rated performance to properly operate off grid or under unreliable grid
operating conditions resisting power interruptions and supply variations. Off grid and
unreliable grid refrigerating appliances are appliances intended to for use with standalone
or intermittent or distorted electrical mains. Electrical mains supply is assumed to be alternating
current (AC) for unreliable grid or direct current (DC) for off grid. This document is also
applicable to hybrid refrigerating appliances.
The test procedures primary focus on the performance of the overall refrigerating appliances
and not on the specific performance of auxiliary components such as electrical batteries,
inverters or rectifiers or any device intended to improve the power quality but external to the
appliance itself. In case a refrigerating appliance is supplied with control unit, an electrical
battery, a voltage protector, an inverter or a rectifier in the original product packaging, these
components are considered as a component of the refrigerating appliance and are connected
during testing.
The tests defined in this document aim to assess the fundamental design and functional
operation of the refrigerating appliance as well as its resilience to given power quality issues.
Unreliable grid (UG) refrigerating appliance categories which are within the scope of this
document are as follows:
a) UG : AC voltage supplied refrigerating appliances designed for proper operation
intermittent
during intermittent power outages, containing an internal thermal store and/or electrical
battery;
b) UG : AC voltage refrigerating appliances designed for operation when connected
distorted
to a distorted grid supply (for example voltage sags or voltage surges);
c) UG : AC voltage refrigerating appliances designed for operation with
intermittent+distorted
intermittent grid/power outages and distorted grid supply (combination of a) and b).
IEC 63437:2025 © IEC 2025
Off grid (OG) refrigerating appliance categories which are within the scope of this document
are as follows:
– OG : DC voltage supplied solar direct drive refrigerating appliances, designed for
SDD
direct connection to a photovoltaic solar panel, containing an internal thermal store with
an optional electrical battery to supply auxiliaries such as a controller, lighting or fans. The
compressor of the appliance is directly supplied by the solar panel;
– OG : DC voltage supplied, electrical battery supported solar refrigerating
battery supported
appliance designed for direct connection to a photovoltaic solar panel, incorporating an
electrical battery to supply the compressor when there is insufficient solar power. These
appliances can also have internal thermal store. The electrical battery is charged by the
solar panel only. The battery will be part of the appliance or will be supplied in the same
packaging of the appliance;
– OG : DC voltage supplied refrigerating appliance designed for proper operation
intermittent
during power outages, containing an internal thermal store or electrical battery, or both;
– OG : Continuous DC voltage supplied refrigerating appliances, without any
continuous
internal thermal store and electrical battery.
This document also defines solar classes, consisting of different irradiance patterns and
unreliable grid protection codes, describing various power outages and voltage
disturbances of the electricity grid. These classes can also be applied for products outside the
scope of this standard.
Refrigerating appliances that are out of scope in this document include AC refrigerating
appliances designed for reliable, good quality continuous supply. These refrigerating
appliances are covered by IEC 62552-1 [7] , IEC 62552-2 [8] and IEC 62552-3 [9] for domestic
refrigerating appliances.
This document does not define requirements for production sampling or conformity assessment
or certification.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
ISO 7000:2019, Graphical symbols for use on equipment - Registered symbols
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
___________
Numbers in square brackets refer to the Bibliography.
IEC 63437:2025 © IEC 2025
3.1 General
3.1.1
refrigerating appliance
insulated cabinet with one or more compartments that are controlled at frozen or unfrozen
compartment temperatures and are of suitable size and equipped for household or small
commercial use, cooled by a natural or forced convection air flow inside the compartment
typically using vapour compression or thermo-electric refrigeration technology
3.1.2
refrigerator
refrigerating appliance intended for the storage of foodstuff, with at least one fresh food
compartment
3.1.3
refrigerator-freezer
refrigerating appliance having at least one unfrozen compartment and at least one frozen
compartment
3.1.4
freezer
refrigerating appliance with only frozen compartments and at least one frozen
compartment
3.1.5
light commercial use
commercial activity generally consisting of sales of chilled foodstuff or beverages
3.1.6
variable temperature compartment
compartment intended for use as two or more alternative compartment types (e.g. a
compartment that can be either an unfrozen compartment or a frozen compartment) and
which is capable of being set by a user to continuously maintain the operating temperature
range applicable for each compartment type claimed at the rated climate class conditions
3.1.7
continuous supply refrigerating appliance
refrigerating appliance designed for continuous (24/7) AC or DC power supply, generally
without an integrated thermal store or electrical battery
3.1.8
solar direct drive refrigerating appliance
SDD refrigerating appliance
DC supply refrigerating appliance designed for direct connection with a defined photovoltaic
solar panel, generally containing an integrated thermal store to allow autonomous operation
during the night or during cloudy days
Note 1 to entry: Some SDD appliances can have a small electrical battery to supply auxiliaries such as a
controller, lighting or fans.
3.1.9
battery supported solar refrigerating appliance
DC supply refrigerating appliance designed for direct connection with a defined photovoltaic
solar panel, containing an integrated electrical battery that is charged by the solar panel only,
to allow autonomous operation of the compressor during the night
IEC 63437:2025 © IEC 2025
3.1.10
hybrid refrigerating appliance
refrigerating appliance with the option to operate on an AC or DC voltage supply
Note 1 to entry: These appliances are generally equipped with two input sockets: an AC input voltage socket and
a DC voltage input socket.
3.1.11
intermittent supply refrigerating appliance
refrigerating appliance designed to tolerate intermittent power supply, generally containing an
integrated thermal store or electrical battery allowing autonomous operation during periods
when electrical mains supply is not available
Note 1 to entry: For AC voltage refrigerating appliances lack of electrical supply is generally caused by power
outages, while for DC voltage refrigerating appliance a depleted battery can be the cause, for example.
3.1.12
distorted supply refrigerating appliance
refrigerating appliance designed to tolerate disturbed (continuous or intermittent) power
supply operation
3.1.13
foodstuff
food and beverages intended for consumption
3.1.14
rated
value declared by the manufacturer (e.g. volume, energy consumption, usage)
3.1.15
auxiliary
electrical component of the refrigerating appliance, excluding the compressor
EXAMPLE Examples of auxiliary components are lighting, supply voltage protectors, fans, electrical heaters or
control boards.
3.2 Unreliable grid supply
3.2.1
unreliable grid
AC voltage electricity supply subject to power outages or power quality disturbances, that are
outside the default specifications of a proper functioning public supply electricity grid
3.2.2
intermittent grid
electricity supply facing power outages
3.2.3
distorted grid
electricity supply facing disturbances in voltage level
3.2.4
unreliable grid nominal test voltage
voltage supply applied for testing unreliable grid refrigerating appliance
...