IEC 60299:2014

Household electric blankets - Methods for measuring performance

IEC 60299:2014 applies to electric blankets, wraps and duvets for household use. This International Standard defines the main performance characteristics of electric blankets, wraps and duvets and specifies methods for measuring these characteristics, for the information of users. This International Standard does not specify values for performance characteristics. This edition includes the following significant technical changes with respect to the previous edition:
a) extended classification;
b) extended list of measurements;
c) temperature measurement means changed to thermocouples.

Couvertures chauffantes électriques à usage domestique - Méthodes de mesure des performances

L'IEC 60299:2014 s'applique aux couvertures, aux châles et aux couettes chauffants électriques à usage domestique. La présente Norme internationale définit les principales caractéristiques de performances des couvertures, des châles et des couettes chauffants électriques à usage domestique et spécifie les méthodes pour la vérification de ces caractéristiques, pour l'information des utilisateurs. La présente Norme internationale ne spécifie pas de valeurs pour les caractéristiques de performances. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) classification étendue;
b) liste de mesures étendue;
c) moyens de mesure de température changés en thermocouples.

General Information

• Status: Published
• Publication Date: 09-Jul-2014
• ICS: 97.100.10 - Electric heaters
• Technical Committee: SC 59C - Electrical heating appliances for household and similar purposes
• Drafting Committee: MT 1 - TC 59/SC 59C/MT 1
• Current Stage: PPUB - Publication issued
• Start Date: 10-Jul-2014
• Completion Date: 15-Aug-2014

Standards Content (Sample)

IEC 60299 ®
Edition 3.0 2014-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household electric blankets – methods for measuring performance

Couvertures chauffantes électriques à usage domestique – méthodes de mesure
des performances
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IEC 60299 ®
Edition 3.0 2014-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household electric blankets – methods for measuring performance

Couvertures chauffantes électriques à usage domestique – méthodes de

mesure des performances
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX N
ICS 97.100.10 ISBN 978-2-8322-1694-1

– 2 – IEC 60299:2014 © IEC 2014
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Classification . 7
4.1 General . 7
4.2 Type . 7
4.3 Heated areas . 7
4.4 Temperature distribution . 7
4.5 Means of control . 7
4.6 Regulation . 7
4.7 Type of supply . 8
4.8 Method of cleaning. 8
4.9 Fixing of the underblanket to the mattress . 8
5 List of measurements . 8
6 General conditions for measurements . 8
7 Dimensions, mass and textile composition . 9
7.1 Dimensions . 9
7.2 Mass . 9
7.3 Textile composition . 10
8 Evenness of temperature . 10
9 Heating-up time and energy consumption . 12
10 Stability of temperature. 12
11 Effect of laundering on dimensions . 13
12 Control settings . 13
Bibliography . 14

Figure 1 – Heated area showing the layout of the plates . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD ELECTRIC BLANKETS –
METHODS FOR MEASURING PERFORMANCE

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
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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 60299 has been prepared by sub-committee 59C: Heating
appliances, of IEC technical committee 59: Performance of household electrical appliances.
This third edition cancels and replaces the second edition published in 1994. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) extended classification;
b) extended list of measurements;
c) temperature measurement means changed to thermocouples.

– 4 – IEC 60299:2014 © IEC 2014
The text of this standard is based on the following documents:
FDIS Report on voting
59C/181/FDIS 59C/184/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.
In this standard, the following print types are used:
– test specifications: in italic type
– notes: in small roman type
– other text: in roman type
– terms defined in Clause 3: in bold type.
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.
HOUSEHOLD ELECTRIC BLANKETS –
METHODS FOR MEASURING PERFORMANCE

1 Scope
This International Standard applies to electric blankets, wraps and duvets for household
use.
This International Standard defines the main performance characteristics of electric blankets,
wraps and duvets and specifies methods for measuring these characteristics, for the
information of users.
This International Standard does not specify values for performance characteristics.
NOTE This standard does not deal with safety requirements that are covered by IEC 60335-2-17.
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 60335-2-17:2012 Household and similar electrical appliances – Safety – Part 2-17:
Particular requirements for blankets, pads, clothing and similar flexible heating appliances
IEC 62301:2011, Household electrical appliances – Measurement of standby power
ISO 2439, Polymeric materials, cellular flexible – Determination of linear dimensions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
blanket
appliance comprising a substantially flat flexible part that is intended to form part of the
bedding, for heating the bed
3.2
flexible part
all layers of material forming the permanent enclosure of the appliance together with the
heating element, thermostats and all other current-carrying parts contained within it.
Note 1 to entry: The flexible part may be inside a detachable cover.
3.3
underblanket
blanket to be used under the occupant of the bed
3.4
overblanket
blanket to be used over the occupant of the bed

– 6 – IEC 60299:2014 © IEC 2014
3.5
wrap
blanket comprising a flexible part intended to be draped over the human body in order to
keep it warm
3.6
duvet
quilted overblanket intended to be used without additional bedding over the occupant of the
bed, the heated element providing supplementary heat
3.7
blanket with uniform temperature
blanket having an even temperature over the heated area
3.8
blanket with non-uniform temperature
blanket in which the temperature gradually increases from the head end to the foot end of the
heated area
3.9
blanket with a high temperature zone
blanket having an even temperature over the major part and having a higher temperature
zone generally at the foot end of the heated area
3.10
blanket with ambient temperature compensation
blanket having a power input which significantly varies inversely with changes in ambient
temperature
3.11
heated area
area of the flexible part enclosed within the outer perimeter of the heating element or electro-
conductive textile
Note 1: The heated area includes a margin outside the perimeter that has a width equal to 0,5 times the average
distance between adjacent runs of the heating element.
Note 2: The heated area includes the return length of the heating element if the average distance between this
part and the adjacent heating element does not exceed the average distance between adjacent runs of the heating
element.
Note 3: If a blanket has two separate areas, the surface between the two areas is considered to be part of the
heated areas, if at any place the distance between the two heating elements does not exceed 1,5 times the
average distance between adjacent runs of the heating element
3.12
controlled appliance
appliance incorporating means in the flexible part for sensing changes in temperature when
the appliance is operated under normal operation, thus automatically controlling the average
power input
Note 1 to entry: The heated area includes the return length of the heating element if the average distance
between this part and the adjacent heating element does not exceed the average distance between adjacent
parallel runs of the heating element.
Note 2 to entry: If a double blanket has two heating elements which are separately controlled, it has two heated
areas.
4 Classification
4.1 General
The classifications of the appliance are stated.
4.2 Type
Electric blankets, wraps and duvets for household use are classified according to their type:
– underblanket;
– overblanket;
– wrap;
– duvet.
4.3 Heated areas
Electric blankets, wraps and duvets for household use are classified according to the size
and the number of heated areas:
– single blanket;
– double blanket with one heated area;
– double blanket with two heated areas.
4.4 Temperature distribution
Electric blankets, wraps and duvets for household use are classified according to
temperature distribution.
4.5 Means of control
Electric blankets, wraps and duvets for household use are classified according to the means
of control:
– non-controlled appliance
– controlled appliance
– blanket with uniform temperature;
– blanket with non-uniform temperature;
– blanket with a high temperature zone.
4.6 Regulation
Electric blankets, wraps and duvets for household use are classified according to means of
regulation:
– blanket without any control;
– blanket with a control having variable settings;
– blanket with a control having step settings;
– blanket with ambient temperature compensation;

– 8 – IEC 60299:2014 © IEC 2014
4.7 Type of supply
Electric blankets, wraps and duvets for household use are classified according to the type of
supply:
– blanket for direct connection to the supply mains;
– extra low voltage blanket.
NOTE An extra low voltage blanket has a rated voltage not exceeding 24 V.
4.8 Method of cleaning
Electric blankets, wraps and duvets for household use are classified according to the
method of cleaning:
– washable by hand;
– machine washable;
– not washable.
4.9 Fixing of the underblanket to the mattress
Electric blankets, wraps and duvets for household use are classified according to the means
of fixing of the underblanket to the mattress:
– underblanket without means of fixing;
– underblanket with tie tapes;
– fitted underblanket.
5 List of measurements
Performance is determined by means of the following measurements:
– dimensions, mass and textile composition (Clause 7);
– evenness of temperature (Clause 8);
– heating-up time and energy consumption (Clause 9);
– stability of temperature (Clause 10);
– effect of laundering (Clause 11);
– control settings (Clause 12).
6 General conditions for measurements
Unless otherwise specified, measurements are made under the following conditions:
a) Test room:
The tests are carried out in a draught-free room in which the ambient temperature is
maintained at 20 °C ± 5 °C.
b) Supply voltage:
The supply voltage is maintained at the rated voltage ± 1 %. When the appliance is
marked with a rated voltage range, the report shall state the voltage used for the test.
NOTE 1 If the results obtained by testing the appliance at rated voltage are considered to be misleading due
to the national supply voltage, the appliance can also be tested at a voltage corresponding to the nominal
voltage of the national supply system.

c) Arrangement of the appliance:
Any detachable cover is fitted and the flexible part is placed between sheets of thermal
insulation , the size of which is such that the edges extend at least 100 mm beyond the
outline of the heated area.
d) The thermal insulation is made of open-cell polyether having:
– cell count 18 + 2 per cm;
– specific mass 30 kg/m +10 %;
– hardness between 120 N and 170 N at 40 % impression measured according
to ISO 2439.
The thermal insulation is supported over its entire area by a piece of plywood 20 mm thick,
situated not less than 300 mm above the floor.
The thickness of the thermal insulation under the appliance is approximately 72 mm and
over the appliance approximately
– no material for duvets,
– 7,2 mm for overblankets and wraps,
– 36 mm for underblankets
NOTE 2 The specification of the thermal insulation is taken from IEC 60335-2-17:2012, Annex AA.
The above specified thickness of the thermal insulation is for reference; the exact
thickness shall be calibrated as specified in IEC 60335-2-17:2012, Annex AA.
7 Dimensions, mass and textile composition
7.1 Dimensions
7.1.1 The dimensions of the flexible part of the appliance and the heated area are
determined.
7.1.2 The dimensions of a washable detachable cover are also determined in order to
assess the effect of laundering.
The appliance is spread out without tension on a flat surface and the length and width are
measured.
The average values for each dimension are calculated.
The dimensions are stated in millimetres (mm), rounded to the nearest 10 mm.
7.1.3 The lengths of flexible cords are determined.
The measurements are made, as applicable, between
– the cord-entry of the flexible part and the control or the transformer;
– the control or the transformer and the plug;
– two controls.
The lengths are stated in metres (m), rounded down to the nearest 0,05 m.
7.2 Mass
The mass of the flexible part is measured after the test of Clause 10.

– 10 – IEC 60299:2014 © IEC 2014
The appliance is conditioned by operating it for 3 h at rated voltage and then the mass is
measured. The specific mass is calculated by dividing the mass by the area of the flexible
part.
2 2
The specific mass is stated in g/m rounded up to the nearest 10 g/m .
NOTE The mass of flexible cords and other external components is not included.
7.3 Textile composition
The textile composition of the external surface of the flexible part and detachable cover, if
any, is stated.
8 Evenness of temperature
The temperature of the surface of the flexible part is measured by means of thermocouples
attached to the centre of copper plates having dimensions of 100 mm × 100 mm × 0,5 mm.
For overblankets, wraps and duvets the plates are placed under the flexible part.
For underblankets the plates are placed over the flexible part.
A plate is placed at the centre of the heated area and oriented so that its axes are at 45° to
the axes of the appliance. Other plates are placed on the heated area, as shown in Figure 1.

100 mm
IEC
Figure 1 – Heated area showing the layout of the plates
No part of any plate shall project beyond the heated area.
The temperature rises are measured when steady conditions are established.
For each heated area, the average temperature rise is calculated from all the measurements.
The range of temperature rises is determined, being the difference between the maximum and
the minimum temperature rises.
The uniformity factor is calculated, being the percentage of the heated area which is within
± 2 K of the average temperature rise.
The test is carried out and the calculation made for both the maximum and minimum settings
of the control.
The evenness of temperature is expressed as the range of temperature rise and the
uniformity factor.
100 mm
400 mm
– 12 – IEC 60299:2014 © IEC 2014
For both settings of the control the range temperature rise is stated rounded to the nearest
Kelvin (K) and the uniformity factor is stated rounded to the nearest 1 %.
NOTE 1 For appliances with a high temperature zone, the calculations are made separately for both parts of the
heated area.
NOTE 2 Evenness of temperature is not measured on appliances with non-uniform heating.
9 Heating-up time and energy consumption
The time taken by the appliance to heat up is determined. The energy consumption during the
heating-up time is determined as well as the energy consumption during a period of operation.
If there is a stand-by setting on the control, the stand-by energy consumption is also
determined.
The test is carried out at an ambient temperature of 15 °C ± 2 °C, the appliance being pre-
conditioned at this temperature for at least 24 h.
The appliance is then operated with the control at the maximum setting until a temperature
rise of 15 K is obtained, the time taken being measured.
The energy consumption is measured during the heat-up time. The control is then adjusted to
the highest setting for continuous use and the appliance is operated for a further period of
8 h, the energy consumption being measured.
The power input when the appliance is in the stand-by mode is measured in accordance with
Clause 5 of IEC 62301:2011.The temperature rise is measured by means of the plate
described in Clause 8 which is placed at the centre of the heated area. The heating-up time is
stated, rounded to the nearest minute.
The energy consumption during the heating-up time and for the complete cycle of operation is
stated in Wh, rounded to the nearest Wh. The stand-by power input is stated, if applicable, in
accordance with Clause 6 of IEC 62301:2011.
10 Stability of temperature
The stability of temperature is determined for controlled appliances.
The appliance is operated at the continuous use setting of the control or, if not provided, at
the lowest setting, the ambient temperature being maintained at 20 °C ± 1 °C. When steady
conditions are established, the temperature rises are measured according to clause 8 and the
average temperature
...