IEC 60335-2-90:2015/AMD1:2019

IEC 60335-2-90 ®
Edition 4.0 2019-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Household and similar electrical appliances – Safety –
Part 2-90: Particular requirements for commercial microwave ovens

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-90: Exigences particulières pour les fours à micro-ondes à usage
commercial
IEC 60335-2-90:2015-08/AMD1:2019-11(en-fr)

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IEC 60335-2-90 ®
Edition 4.0 2019-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Household and similar electrical appliances – Safety –

Part 2-90: Particular requirements for commercial microwave ovens

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-90: Exigences particulières pour les fours à micro-ondes à usage

commercial
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.20 ISBN 978-2-8322-1010-2

– 2 – IEC 60335-2-90:2015/AMD1:2019
© IEC 2019
FOREWORD
This amendment has been prepared by subcommittee 61B: Safety of microwave appliances for
household and commercial use, of IEC technical committee 61: Safety of household and similar
electrical appliances.
The text of this amendment is based on the following documents:
CDV Report on voting
61B/618/CDV 61B/631/RVC
61B/619/CDV 61B/632/RVC
61B/617/CDV 61B/633/RVC
61B/616/CDV 61B/634/RVC
61B/612/CDV 61B/635/RVC
61B/620/CDV 61B/636/RVC
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations can need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 12 months or later than 36 months from the date of publication.

___________
1 Scope
Replacement:
Replace the first dashed item of NOTE 105 with the following:
– for appliances intended to be used in vehicles or on trains, on board ships or board aircraft, additional
requirements may be necessary;

© IEC 2019
2 Normative references
Add the following references to the existing list:
IEC 60335-2-36, Household and similar electrical appliances – Safety – Part 2-36: Particular
requirements for commercial electric cooking ranges, ovens, hobs and hob elements
IEC 60335-2-42, Household and similar electrical appliances – Safety – Part 2-42: Particular
requirements for commercial electric forced convection ovens, steam cookers and steam-
convection ovens
IEC 60335-2-49, Household and similar electrical appliances – Safety – Part 2-49: Particular
requirements for commercial electric hot cupboards
IEC 60335-2-75, Household and similar electrical appliances – Safety – Part 2-75: Particular
requirements for commercial dispensing appliances and vending machines
3 Definitions
Replace the title of this clause, not the numbering, with “Terms and definitions”.
3.113
microwave enclosure
Renumber Note 2 with Note 1 and Note 3 with Note 2.
11 Heating
11.7 Add the following text after the first sentence:
The last cycle does not include a rest period of 1 min.
15 Moisture resistance
15.2 Replace the text of the addition with the following:
A quantity of 0,5 l of the same spillage solution is poured steadily over the shelf over a period
of 1 min. If the shelf can collect spilled liquid, it is filled with the solution and a further 0,5 l is
then added over a period of 1 min.
15.101 Replace the first and second paragraph of the compliance criterion with the following:
The probe is completely immersed in water containing approximately 1 % NaCl and having a
temperature of 20 °C ± 5 °C. The solution is heated to the boiling point in approximately 15 min.
The probe is then removed from the boiling solution and immersed in the solution having a
temperature of 20 °C ± 5 °C for 30 min.
This procedure is carried out five times, after which the probe is removed from the solution. All
traces of liquid are then removed from the surface.
Replace the Note with the following:
NOTE Detachable temperature-sensing probes are not connected to the appliance for this test. Non-detachable
temperature-sensing probes are tested in the cavity, the probe being immersed as much as possible.

– 4 – IEC 60335-2-90:2015/AMD1:2019
© IEC 2019
19 Abnormal operation
19.13 Replace the first sentence of the first paragraph with the following.
During the tests, the temperature of windings shall not exceed the values shown in Table 8.
19.101 Add the following text after the last paragraph:
If microwave leakage exceeds 100 W/m , the following alternative measurement method shall
be applied, which modifies the microwave leakage limit of 19.13.
In order to identify and mark all spots where peak values of microwave leakage exceed
100 W/m , the instrument antenna is moved again over the external surface of the appliance,
particular attention being given to the door and its seals.
NOTE 1 A peak hold function of the measurement instrument, if any, can be activated for identification of spots
where peak values of microwave leakage exceeds 100 W/m .
The leakage values of each such spot shall be recorded and the averaged leakage value of any
spot over the most onerous 20 s shall not exceed 100 W/m . Furthermore, the peak value shall
not exceed 500 W/m .
NOTE 2 Since the stirrer and/or turntable revolution time and the number of microwave stirrer blades determine the
frequency and duration of actual peak leakage values, instruments with appropriate specifications (like minimum
sampling time, capability to measure peak values of power flux density, capability to average these values) can be
used.
19.102 Replace the current NOTE with the same normative text and add the following text:
These short-circuits are applied one at a time.
19.104 Replace Table 101 with the following new table:
Table 101 – Number of potatoes
Rated microwave power output Volume of the cavity Number of potatoes
W l
<600 ≥14 and <28 2
≥600 and <1 000 ≥28 and <42
≥1 000 and <2 000 ≥42 and <56 6
a
≥2 000  ≥56
6 + N
NOTE The rated microwave power output or the volume of the cavity applies, whichever results in the higher
number of potatoes.
a
N is 2 for each 500 W increase in power output or for each 14 l increase in volume.

20 Stability and mechanical hazards
20.101 Replace the fifth paragraph with the following:
For appliances normally used on a table, the mass is
– 7 kg for stationary appliances;
– 3,5 kg for portable appliances.

© IEC 2019
21 Mechanical strength
Add, before 21.101, the following new Subclause 21.2:
21.2 Addition:
Compliance is also checked by the tests of 21.101 to 21.105.
During these tests, the appliance is rigidly supported, except for 21.102.
21.1
Delete this subclause.
22 Construction
22.102 Replace the first paragraph with the following:
Oven vents shall be constructed so that any moisture or grease discharged through them cannot
affect clearances and creepage distances between live parts and other parts of the
appliance.
22.106 Replace the first paragraph with the following:
The supervision device of each monitored door interlock shall render the appliance inoperable
if its switching part fails to control the microwave generator.
Replace Note 4 with the following:
NOTE 4 For appliances having a rated voltage under 150 V and those with a rated current over 20 A, the test with
the series impedance is not carried out.
22.112 Replace the third sentence of first paragraph of the compliance criterion with the
following:
The force is then released and, if the oven can be operated with the temperature-sensing
probe still being placed in the trapped position, the microwave leakage is measured under the
conditions specified in Clause 32 and shall not exceed 100 W/m .
22.117 Replace this subclause with the following:
22.117 Where interlocks are required to comply with this standard and are operated by
detachable parts, they shall be guarded so that accidental operation is prevented.
Compliance is checked by inspection and by manual test with test probe B.
22.118 Replacement:
Replace the requirement with the following:
Lights, switches or push-buttons for the indication of danger, alarm or similar situations shall
be coloured red.
Add the following new subclause:

– 6 – IEC 60335-2-90:2015/AMD1:2019
© IEC 2019
22.121 For appliances that are controlled by programmable electronic circuits that limit the
number of heating elements and motors from being energised at the same time, simultaneous
activation of any combination of heating elements and motors shall not r
...