IEC 60335-2-79:2002/AMD2:2007

INTERNATIONAL IEC
STANDARD 60335-2-79
AMENDMENT 2
2007-07
Amendment 2
Household and similar electrical appliances –
Safety –
Part 2-79:
Particular requirements for high pressure
cleaners and steam cleaners
Reference number
IEC 60335-2-79 Amend. 2:2007(E)

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INTERNATIONAL IEC
STANDARD 60335-2-79
AMENDMENT 2
2007-07
Amendment 2
Household and similar electrical appliances –
Safety –
Part 2-79:
Particular requirements for high pressure
cleaners and steam cleaners
PRICE CODE
Commission Electrotechnique Internationale P
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60335-2-79 Amend. 2 © IEC:2007(E)
FOREWORD
This amendment has been prepared by subcommittee 61J: Electrical motor-operated cleaning
appliances for industrial 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
61J/252/FDIS 61J/258/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 maintenance result 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• withdrawn,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.
A bilingual version of this publication may be issued at a later date.
_____________
3 Definitions
3.116 Delete this definition.
3.117 Renumber the definition as 3.116 and modify the note as follows:
Print "motorized cleaning head" in bold letters.
Add the following new definitions:
3.117
low pressure accessory
accessories to be connected to a high pressure cleaner equipped with one or more nozzles
with an equivalent diameter exceeding 2 mm
NOTE 101 Nozzles with an equivalent diameter exceeding 2 mm used in a high pressure cleaner system are not
considered to become clogged.
NOTE 102 Typical examples of low pressure accessories are washing brushes, foam nozzles, washing
sponges.
3.118
hand-guided appliance
appliance to be moved on the floor while in operation, guided by a mechanically coupled
handle
60335-2-79 Amend. 2 © IEC:2007(E) – 3 –
7 Marking and instructions
7.1 Addition:
Replace the third paragraph after Note 101 by:
All pressure hoses shall be marked with a pressure of at least the permissible pressure in
megapascals and the maximum temperature in degrees Celsius and shall be marked with the
name of the manufacturer and the date of production. These data may be coded.
Add the following new note after the new third paragraph:
NOTE 102 For low pressure accessories, no marking of the permissible pressure is necessary.
Renumber Note 102 as Note 103.
Add the two following new paragraphs:
Appliances not intended to be connected to the potable water mains shall be marked with the
symbol according to Figure 104. It is acceptable to show this symbol in monochrome colour.
Appliances that can be used indoors and are powered by internal combustion engines, except
LPG-powered engines, shall be marked with the symbol according to Figure 105. It is
acceptable to show this symbol in monochrome colour.
7.12 Addition:
Add the following new paragraphs:
The instructions shall contain the substance of the following, if applicable.
– WARNING: Do not use combustion engine powered appliances indoors unless adequate
ventilation is assessed by national labour authorities.
– WARNING: Ensure that any exhaust emissions are not in the vicinity of air intakes.
For appliances intended to be connected to the potable water mains, the instruction shall
contain the substance of the following, if applicable:
– adequate information for the correct connection to the potable water mains;
– necessary length and quality of the water supply hose;
– necessary measures for conversion of the connection from water mains supply to supply
from other water sources.
For appliances not intended to be connected to the water mains, the instruction shall contain
the substance of the following, if applicable:
– adequate information for the correct connection to the water supply;
– adequate information about suction operation;
– necessary length and quality of the water supply hose;
– necessary measures for conversion of the connection from supply from other water
sources to supply from the potable water mains (if applicable).
For all appliances, the instruction shall contain the substance of the following:
– water that has flown through backflow preventers is considered to be non-potable.
7.101 Delete, in the second paragraph, "for water-suction cleaning appliances".

– 4 – 60335-2-79 Amend. 2 © IEC:2007(E)
10 Power input and current
10.101 Modify the last line as follows:
Print "permissible pressure" and "rated pressure" in bold letters.
15 Moisture resistance
15.2 Replacement:
Replace the first paragraph by:
Appliances shall be constructed so that spillage of liquid due to normal operation, overfilling
or overturning of unstable, hand-guided appliances and hand-held appliances does not
affect their electrical insulation.
Replace the fourth paragraph of the test by:
Hand-guided appliances and hand-held appliances and appliances that are unstable are
then, with the containers completely filled for the float tank, if any, and with the most
conductive detergent recommended by the manufacturer for the detergent tank, if any, and
with the cover lid in place, overturned from the most unfavourable of the normal positions of
use, and are left in that position for 5 min, unless the appliance returns automatically to its
normal position of use.
15.2 Delete, in the penultimate paragraph before Note 102, "of water-suction cleaning
appliances".
15.101 Delete in the first paragraph "of water-suction cleaning appliances".
21 Mechanical strength
Add the following new subclause:
21.101.3 A low pressure accessory is subjected to a static pressure test of two times the
measured pressure in the system, when connected to the most severe high pressure cleaner
it is intended to be used with, for 5 min at room temperature.
21.103 Replace the first paragraph by:
Hand-held appliances, hand-guided appliances and appliances carried on the operator's
body in normal use and spray guns shall be resistant to dropping.

60335-2-79 Amend. 2 © IEC:2007(E) – 5 –
22 Construction
Add the following new subclauses:
22.47 This clause of Part 1 is not applicable.
22.48 This clause of Part 1 is applicable except as follows:
Replace the existing text of the test by:
Compliance is checked by the relevant tests of IEC 61770, as modified in Annex AA of this
standard.
22.103 Replace the existing sixth paragraph by:
Compliance is checked by inspection and the following test:
The operating means of the trigger gun of a high pressure cleaner or of a hand-held washing
device shall be locked in the non-operating condition. The pressure in the fluid system is
adjusted to 2,5 MPa. The actuator of the operating means shall then be stressed for 1 min at
room temperature with a force of 150 N, applied in the middle of the actuator in the normal
direction of operation.
During and after the test, there shall be no leakage of water. After the test, the locking device
shall still be functional.
25 Supply connection and external flexible cords
25.7 Addition:
Replace the first sentence by:
Supply cords of non-fixed appliances shall not be less than 5 m in length.
32 Radiation, toxicity and similar hazards
Replace the existing text by:
This clause of Part 1 is applicable.

– 6 – 60335-2-79 Amend. 2 © IEC:2007(E)
Add the following new figures:

IEC  1256/07
Figure 104 – Warning symbol: Appliance not suitable for connection
to the potable water mains
IEC  1257/07
Figure 105 – Warning symbol: Do not inhale fumes

60335-2-79 Amend. 2 © IEC:2007(E) – 7 –
Add the following new annex:
Annex AA
(normative)
Requirements to avoid backsiphonage

The requirements of IEC 61770 are applicable except as follows:
1 Scope
Replace the text of this clause by the following new text:
This standard specifies requirements for the connection of high pressure cleaners and steam
cleaners to water mains having a water pressure not exceeding 1,2 MPa. These requirements
are intended to prevent the backsiphonage of non-potable water into the potable water mains.
NOTE The connection of the appliance to the water mains may be temporary or permanent.
3 Definitions
3.3 Replace the note by:
NOTE Examples are airgaps and backflow preventers with reduced pressure zone.
3.4 Add, after “feed pipe and”, the following:
“…. the maximum or ……”
3.9 Add the following Note:
NOTE For three-phase appliances 5 s and for single phase appliances 2 s may be appropriate.
Add the following new definitions:
3.101
backflow preventer with reduced pressure zone
safety device which artificially provides disconnection by the action or the reaction of one or
more hydromechanical closing and venting devices activated by pressure differences
3.102
protection point
location in a hydraulic circuit where a safety device is installed
4 General requirements
4.2 Replace the existing text by:
Backflow prevention devices shall be incorporated in, or fixed to, the appliance or to the water
supply system and constructed so that
– their functional characteristics cannot be changed, even intentionally,
– their selection of the necessary safety level is in compliance with Annex BB.

– 8 – 60335-2-79 Amend. 2 © IEC:2007(E)
4.3 Not applicable.
4.4 Not applicable.
5 General conditions for the tests
5.4 Replace the text by:
Tests, except the functional and endurance tests on airgaps and backflow preventers with
reduced pressure zone, are made on the appliance, unless this is impracticable. The
compliance is then checked by the tests according to Annex A of IEC 61770.
NOTE During the functional and endurance tests, additional samples may be required.
7 Pipe interrupters
This clause of IEC 61770 is not applicable.
8 Dynamic backflow preventers
This clause of IEC 61770 is not applicable.
9 Hose-sets
This clause of IEC 61770 is not applicable.
Add the following new clause:
10 Backflow preventer with reduced pressure zone
10.1 The settings of the action- and difference pressure of the device shall be fixed and not
adjustable.
Only the pressure of the water of the supply network can operate the control of the internal
components of the device.
Possible additional control devices (electric, pneumatic) shall not adversely affect the
backflow protection function.
When installed according to the instructions for use, the drain of the backflow preventer with
reduced pressure zone shall point downwards.
The design of the relief valve operation shall be such that when the differential pressure over
the upstream check valve is less than 14 kPa (140 mbar), the relief valve shall be open to
ensure positive safety.
Any water retention shall not be possible within the reduced pressure zone.
The cross-sections of the passage orifices and of the pilot tube for operation of the relief
device shall be equal to or greater than 12,5 mm , no dimension for the calculation of the
cross-section shall be less than 4 mm.

60335-2-79 Amend. 2 © IEC:2007(E) – 9 –
An air break to drain shall exist between any waste drain and any means of collecting the
discharged water.
The backflow preventer with reduced pressure zone, with an air break to drain fitted, shall
evacuate the full relief flow rate without spilling to the outside.
This air break to drain shall be directly incorporated into the backflow preventer with reduced
pressure zone.
The relief orifice of the device shall permit neither the fitting of a standardized threaded pipe
nor the connection of a standardized pipe or shape, be it by glue, welding or interlocking.
10.2 Verification of the pressure difference between the upstream and the reduced
pressure zones
For the following tests, the manufacturer has to provide a special sample having the
necessary test ports to verify the function of the backflow preventer with reduced pressure
zone.
Test ports have to be provided on the type te
...