IEC 60335-2-34:2012/AMD2:2016

IEC 60335-2-34 ®
Edition 5.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
Household and similar electrical appliances – Safety –
Part 2-34: Particular requirements for motor-compressors

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-34: Exigences particulières pour les motocompresseurs

IEC 60335-2-34:2012-05/AMD2:2016-11(en-fr)

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IEC 60335-2-34 ®
Edition 5.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
Household and similar electrical appliances – Safety –

Part 2-34: Particular requirements for motor-compressors

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-34: Exigences particulières pour les motocompresseurs

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.30 ISBN 978-2-8322-3731-1

– 2 – IEC 60335-2-34:2012/AMD2:2016
© IEC 2016
FOREWORD
This amendment has been prepared by sub-committee 61C: Safety of refrigeration 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:
FDIS Report on voting
61C/686/FDIS 61C/691/RVD
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 amendment and the base 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• withdrawn,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.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may 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.
The contents of the corrigendun of June 2017 have been included in this copy.
_____________
1 Scope
In the second paragraph, replace “480” by “600”.
6 Classification
6.101 In the first paragraph of the requirement, replace “not incorporating an” by “without an
incorporated or associated”.
In the second paragraph of the requirement replace “incorporating an” by “with an
incorporated or associated”.
13 Leakage current and electric strength at operating temperature
Add the following new subclause:

© IEC 2016
13.3 Addition:
In Table 4, add the following to table footnote a:
The test voltage for 600 V multi-phase appliances is that specified for a working voltage > 250 V where U is taken
as the rated voltage.
16 Leakage current and electric strength
Replace the text by the following:
This clause of Part 1 is applicable except as follows.
16.3 In Table 7 add the following to table footnote a:
The test voltage for 600 V multi-phase appliances is that specified for a working voltage > 250 V where U is taken
as the rated voltage.
19 Abnormal operation
19.11.2 Replace the text of the addition by the following:
For simulation of the fault conditions, a motor-compressor with its incorporated or
associated electronic circuit is connected to the substitute refrigeration circuit of Figure AA.1
and operated under the conditions given in Clause AA.5.The conditions applied are the step
prior to that which caused the protective device to operate or the motor-compressor to stall
during the tests of Clause AA.5.
22 Construction
22.7 Replace the text of the replacement by the following:
Housings shall withstand the pressure expected in normal use.
Compliance is checked by the following tests.
A housing which is exposed to high side pressure, including those in a motor-compressor
incorporating a bypass valve, shall be subjected to a test pressure equal to:
– for subcritical refrigeration systems other than those using R-744, 3,5 times the saturated
vapour pressure of the refrigerant at 70 °C, the test pressure being rounded up to the next
0,5 MPa (5 bar);
– for R-744 subcritical refrigeration systems, 3,5 times the saturated vapour pressure of the
refrigerant at 27 °C, rounded up to the next 0,5 MPa (5 bar).
NOTE 101 Example of test pressure calculation for R-22 (subcritical):
Saturated vapour pressure at 70 °C (gauge with respect to atmospheric pressure at STP) = 2,89 MPa (28,9 bar)
Test pressure = 3,5 × 2,89 MPa (28,9 bar)
= 10,1 MPa (101 bar)
= 10,5 MPa (105 bar) when rounded up to the next 0,5 MPa (5 bar).

– 4 – IEC 60335-2-34:2012/AMD2:2016
© IEC 2016
– for transcritical refrigeration systems, the highest of
• 3 times the design pressure; or
• the test pressure declared by the manufacturer; or
• the test pressure specified in Table 101.
The test values for some refrigerants are given in Table 101. For refrigerants not mentioned,
the saturated vapour pressure at the temperatures detailed is obtained from refrigerant
vapour pressure curves supplied by the refrigerant manufacture.
Table 101 – Minimum high side test pressures
Refrigerant formulae Refrigerant Test pressure
number
MPa (bar)
Subcritical
CCl F
R-12 6,5 (65)
2 2
CF CH F R-134a 7,5 (75)
3 2
CHCIF
R-22 10,5 (105)
CH F R-32 17,0 (170)
2 2
CH CH CH
R-290 9,0 (90)
3 2 3
CF CF=CH R-1234yf 7,0 (70)
3 2
CF CH=CHF R-1234ze 5,5 (55)
CH(CH )
R-600a 3,5 (35)
3 3
CO
R-744 23,5 (235)
R-500 7,5 (75)
by weight 73,8 % R-12 + 26,2 % R-152a
by weight 48,8 % R-22 + 51,2 % R-115
R-502 11,0 (110)
by weight 44 % R-125 + 52 % R-143a + 4 % R-134a R-404A 12,5 (125)
by weight 50 % R-125 + 50 % R-143a R-507A 12,5 (125)
by weight 25 % R-125 + 52 % R-134a + 23 % R-32 R-407C 11,0 (110)
by weight 50 % R-125 + 50 % R-32 R-410A 16,5 (165)
Transcritical
CO R-744 42 (420)
NOTE The refrigerant test pressure data is based on NIST Reference Fluid Thermodynamic and Transport
Properties Database (REFPROP): Version 9.1.

© IEC 2016
In subcritical applications, a housing which is exposed only to low side pressure, including
those in a motor-compressor incorporating a bypass valve, shall be subjected to a test
pressure equal to
– for subcritical applications, other than those using R-744, the higher of
• 5 times the saturated vapour pressure of the refrigerant at 20 °C rounded up to the
next 0,2 MPa (2 bar); or
• 2,5 MPa (25 bar);
– for subcritical applications using R-744, 5 times the saturated vapour pressure of the
refrigerant at −6,5 °C rounded up to the next 0,2 MPa (2 bar).
In transcritical refrigeration systems, a housing which is exposed only to low side
pressure shall be subjected to a test pressure that is equal to the highest of
• 5 times the design pressure; or
• 5 times the saturated vapour pressure of the refrigerant at 20 °C rounded up to the
next 0,2 MPa (2 bar); or
• 2,5 MPa (25 bar);or
• the test pressure specified in Table 102.
The test values for some refrigerants are given in Table 102. For refrigerants not mentioned,
the saturated vapour pressure at the temperatures detailed is obtained from refrigerant
vapour pressure curves supplied by the refrigerant manufacture.
NOTE 102 Example of test pressure calculation for R-22 (subcritical):
Saturated vapour pressure at 20 °C (gauge with respect to atmospheric pressure at STP) = 0,81 MPa (8,1 bar)
Test pressure = 5 × 0,81 MPa (8,1 bar)
= 4,05 MPa (40,5 bar)
= 4,2 MPa (42 bar) when rounded up to the next 0,2 MPa (2 bar).

– 6 – IEC 60335-2-34:2012/AMD2:2016
© IEC 2016
Table 102 – Minimum low side test pressures
Refrigerant formulae Refrigerant Test pressure
number
MPa (bar)
Subcritical
CCl F R-12 2,5  (24)
2 2
CF CH F R-134a 2,5  (24)
3 2
CHCIF R-22 4,2  (42)
CH F R-32 7,0  (70)
2 2
CH CH CH
R-290 3,8  (38)
3 2 3
CF CF=CH R-1234yf 2,6  (26)
3 2
CF CH=CHF R-1234ze 2,5  (18)
CH(CH ) R-600a 2,5  (10)
3 3
CO R-744 14,2 (142)
by weight 73,8 % R-12 + 26,2 % R-152a
R-500 3,0  (30)
by weight 48,8 % R-22 + 51,2 % R-115
R-502 4,6  (46)
by weight 44 % R-125 + 52 % R-143a + 4 % R-134a
R-404A 5,0  (50)
R-507A 5,2  (52)
by weight 50 % R-125 + 50 % R-143a
by weight 25 % R-125 + 52 % R-134a + 23 % R-32
R-407C 4,0  (40)
by weight 50 % R-125 + 50 % R-32
R-410A 6,8  (68)
Transcritical
R-744 28,2 (282)
CO
NOTE The refrigerant test pressure data is based on NIST Reference Fluid Thermodynamic and Transport
Properties Database (REFPROP): Version 9.1.

NOTE 103 Further information relating to refrigerant number designations can be obtained from ISO 817.
For refrigerant blends, the saturated vapour pressure is taken as the pressure at the dew
point temperature of 20 °C and 70 °C for low side and high side respectively.
For two stage motor-compressors with direct discharge from the second stage, the housing
is considered to be exposed to low side pressure.
For two stage motor-compressors without direct discharge from the second stage, the
housing is considered to be exposed to high side pressure.
The test shall be carried out on two samples. The test samples are filled with a liquid, such as
water, to exclude air and are connected in a hydraulic pump system. The pressure is raised
gradually until the required test pressure is reached. This pressure is maintained for 1 min
during which time the sample shall not leak except as indicated below.
Where gaskets are employed for sealing the housing of a semi-hermetic motor-
compressor, leakage at gaskets is not considered as a failure, provided the leakage occurs
at a pressure greater than 40 % of the required test pressure.
If a leakage occurs, the test has to be repeated on a sample specially prepared by the
manufacturer to avoid leakage at the gasket.

© IEC 2016
For a semi-hermetic motor-compressor employing a bypass valve which relieves high side
pressure into the low side at a predetermined pressure differential, the housing shall be
capable of withstanding the required test pressure even though leakage occurs at gaskets.
NOTE 104 All pressures are gauge pressures.
29 Clearances, creepage distances and solid insulation
29.1 Add the following to the addition:
For a rated voltage > 300 V and ≤ 346 V the rated impulse voltage is for
– overvoltage category I: 2 500 V;
– overvoltage category II: 4 000 V;
– overvoltage category III: 6 000 V.
Add the following new subclause:
29.3.4 Addition:
For a rated voltage > 300 V and ≤ 346 V the minimum thickness for accessible parts of
reinforced insulation consisting of a single layer is for
– overvoltage category I: 0,6 mm;
– overvoltage category II: 1,2 mm;
– overvoltage category III: 1,5 mm.
NOTE 101 For multi-phase appliances, the line to neutral or line to earth voltage is used for rated voltage.

– 8 – IEC 60335-2-34:2012/AMD2:2016
© IEC 2016
Annex AA – Running overload tests for motor-compressors classified as tested
with Annex AA
AA.4 Replace the first paragraph by the following:
The motor-compressor including the motor-compressor protection system and motor-
compressor control system, if any, is connected to the substitute refrigeration circuit of
Figure AA.1 and operated under the appropriate conditions given in Table AA.2. However, for
R-744 refrigerant intended for use in a transcritical refrigeration system, for all tests the
operating discharge pressure is 12 MPa and for test 4 the return gas temperature is +25 °C.
The tests are continued until steady conditions are reached.
Replace Table AA.2 including its title by the following:

© IEC 2016
Table AA.2 – Substitute refrigeration circuit conditions for operating under maximum load conditions
Test Applied voltage Evaporation Condensation Motor-compressor Return gas temperature
Back pressure application
number temperature temperature ambient temperature
category
°C °C °C °C
4 Rated voltage Low back pressure (LBP) – max.
–15
+65 +43 +43
load – max. cooling
5 Rated voltage Low back pressure (LBP) – min. +43
–35 +49 +25
load – max. cooling
Rated voltage
4 Medium back pressure (MBP) – +43
0 +65 +25
max. load – max. cooling
5 Rated voltage Medium back pressure (MBP) –
+43
–20 +55 +25
min. load – max. cooling
4 Rated voltage High back pressure (HBP) – max.
+43
+15 +65 +25
load – max. cooling
5 Rated voltage High back pressure (HBP) – min.
+43
–5 +55 +25
load – max. cooling
– 10 – IEC 60335-2-34:2012/AMD2:2016
© IEC 2016
In the second paragraph, replace “4, 5, 6 and 7,” by “4 and 5”.
Replace the text of the second paragraph first dashed item by the following:
– the temperature rises of th
...