EN 50428:2005

SLOVENSKI SIST EN 50428:2006
STANDARD
januar 2006
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(istoveten EN 50428:2005)
Switches for household and similar fixed electrical installations – Collateral standard
– Switches and related accessories for use in home and building electronic systems
(HBES)
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29.120.40; 97.120
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EUROPEAN STANDARD EN 50428
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2005
ICS 29.120.40; 97.120
English version
Switches for household and similar fixed electrical installations –
Collateral standard –
Switches and related accessories for use
in home and building electronic systems (HBES)

Interrupteurs pour installations électriques Schalter für Haushalt und ähnliche
fixes domestiques et analogues – ortsfeste elektrische Installationen –
Norme collatérale – Ergänzungsnorm –
Interrupteurs et appareils associés Schalter und ähnliches Installations-
pour usage dans les systèmes material in elektronischer Systemtechnik
électroniques des foyers domestiques für Heim und Gebäude (ESHG)
et bâtiments (HBES)
This European Standard was approved by CENELEC on 2004-12-07. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50428:2005 E
Foreword
This European Standard has been prepared by the Technical Committee CENELEC TC 23B:
Switches for household and similar fixed electrical installations.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50428 on 2004-12-07.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-01-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-01-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 89/336/EEC. See Annex ZZ.
This standard has to be used in conjunction with EN 60669-1 and EN 60669-2-1. It lists the
additional changes necessary to convert it into the European Standard: Switches for household and
similar fixed electrical installations - Collateral standard - Switches and related accessories for use
in home and building electronic systems (HBES)
When this standard states "addition", "modification" or "replacement", the relevant text of
EN 60669-1 or EN 60669-2-1 (hereinafter called Part 1 and Part 2-1 respectively) is to be adapted
accordingly.
NOTE  The following numbering system is used:
- subclauses, tables and figures that are numbered starting from 201 are additional to those in Part 2-1;
- additional annexes to Part 1 are lettered AA, BB, etc.
__________
- 3 - EN 50428:2005
Contents
1 Scope .6
2 Normative references .6
3 Definitions .7
4 General requirements.8
5 General notes on tests .8
6 Ratings .8
7 Classification .9
8 Marking.9
9 Checking of dimensions.9
10 Protection against electric shock .9
11 Provision for earthing .10
12 Terminals .10
13 Constructional requirements .10
14 Mechanism.10
15 Resistance to ageing, protection provided by enclosures of switches, and resistance to
humidity .10
16 Insulation resistance and electric strength .11
17 Temperature rise.11
18 Making and breaking capacity .11
19 Normal operation .11
20 Mechanical strength .11
21 Resistance to heat .11
22 Screws, current-carrying parts and connections .11
23 Creepage distances, clearances and distances through sealing compound .11
24 Resistance of insulating material to abnormal heat, to fire and to tracking .16
25 Resistance to rusting.16
26 EMC requirements .16
101 Abnormal conditions.21
102 Components.21

Annex A (normative) Survey of specimens needed for tests.22
Annex B (normative) Additional requirements for switches having facilities for the
outlet and retention of flexible cables .22
Annex AA (normative) Examples of types of electronic switches and their functions .22
Annex BB (normative) Measurement of clearances and creepage distances .23
Annex CC (normative) Test set-ups for HBES switches using TP-Media and PL-Media.26
Annex DD (informative) A-deviations .38
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives.39

Figure 201 – Protective separation between circuits .14
Figure BB.1 – Narrow groove .25
Figure BB.2 – Wide groove .25
Figure BB.3 – V-shaped groove .25
Figure BB.4 – Rib.26
Figure BB.5 – Uncemented joint with narrow groove.26
Figure BB.6 – Uncemented joint with wide groove .26
Figure BB.7 – Uncemented joint with narrow and wide grooves.26
Figure BB.8 – Intervening, unconnected conductive part .27
Figure BB.9 – Narrow recess .27
Figure BB.10 – Wide recess.27
Figure CC.1 – Test at the mains connections of bus devices .28
Figure CC.2 – Test at the Medium Interface of bus devices .29
Figure CC.3 – Test at the Universal Interface, Process Interface and Input/Output
connections of bus devices.29
Figure CC.4 – Test at the mains connections of HBES devices .30
Figure CC.5 – Test at the Medium Interface of HBES devices .30
Figure CC.6 – Test at the UI, PI, I/O connections of HBES devices.31
Figure CC.7 – Electrostatic discharge .32
Figure CC.8 – Test in the anechoic chamber .32
Figure CC.9 – Top view.33
Figure CC.10 – Side view 1.33
Figure CC.11 – Side view 2.33
Figure CC.12 – Test arrangement for EN 61000-4-6 test.34
Figure CC.13 – Example of a test arrangement in the anechoic chamber.35
Figure CC.14 – Side view 1 (example).35
Figure CC.15 – Test arrangement for radio emission interference voltage
on the bus cable.36
Figure CC.16 – Test arrangement for radio emission interference voltage at the mains terminal.37
Figure CC.17 – Test arrangement for common mode noise current test on the bus cable .37
Figure CC.18 – Test arrangement for voltage dips and variations for the mains
connections of a HBES switch.38

Table 11 – Forces to be applied to covers, cover-plates or actuating members whose
fixing is not dependent on screws.11
Table 14 – Test voltage, points of application and minimum values of insulating
resistance for the verification of dielectric strength .11
Table 201 – Relation between the rated voltage of the HBES switch, the rated insulation voltage
and the rated impulse voltage .12
Table 202 – Minimum clearances without verification test.15
Table 203 – Test voltages and corresponding altitudes .16
Table 204 – Minimum clearances with verification test.16
Table 205 – Minimum creepage distances of basic, supplementary and reinforced insulation.17
Table 206 – Minimum creepage distances of basic, supplementary and reinforced insulation.17
Table 207 – Immunity tests (overview) .19

- 5 - EN 50428:2005
Table 208 – Voltage dip and short-interruption test values.20
Table 209 – Surge immunity test voltages.20
Table 210 – Fast transient test values.21
Table CC.1 – Limits of conducted common mode disturbances for control, signal and
DC power wires .35
Table CC.2 – Limits of mains terminal interference voltage .36

1 Scope
This clause of Part 2-1 is replaced by the following:
This collateral standard applies to HBES switches with a working voltage not exceeding 250 V a.c.
and a rated current up to and including 16 A. for household and similar fixed electrical installations
either indoors or outdoors and to associated electronic extension units.
It applies
– to HBES switches for the operation of lamp circuits and the control of the brightness of lamps
(dimmers) as well as the control of the speed of motors (e.g. those used in ventilating fans) and
for other purposes (e.g. heating installations ),
– to sensors, actuators, switched-socket-outlets, associated electronic extension units, etc
In the following document the word " HBES switch " is applied to describe all kind of HBES devices
e.g. switches, sensors, actuators, switched-socket-outlets, associated electronic extension units,
etc.
The operation and control are performed
– intentionally by a person via an actuating member, a key, a card, etc., via a sensing surface or
a sensing unit, by means of touch, proximity, turn, optical, acoustic, thermal,
– by physical means, e.g. light, temperature, humidity, time, wind velocity, presence of people,
– by any other influence;
and transmitted
– by an electronic signal via several media, e.g. powerline (mains), twisted pair, optical fibre,
radio frequency, infra-red, etc
HBES Switches complying with this standard are suitable for use at ambient temperatures not
normally exceeding 25 °C, but occasionally reaching 35 °C.
There is no need for functional safety requirements in this standard. Functional safety requirements
shall be covered by the standards of the devices which are controlled by the HBES.
In locations where special conditions prevail, such as higher temperature special constructions may
be required.
NOTE 1  This annex is not intended to cover devices falling within the scope of IEC 60730.
NOTE 2  Electronic switches without a mechanical switch in the main circuit do not provide a "full off-state". Therefore, the
circuit on the load side should be considered to be live.
NOTE 3  HBES-switches to be connected to telecommunication networks should fulfil the relevant standard.
2 Normative references
Annex ZA of Part 2-1 is applicable with the following additions:
EN 50065-1, Signalling on low-voltage electrical installations in the frequency range 3 kHz to
148,5 kHz – Part 1: General requirements, frequency bands and electromagnetic disturbances
EN 50065-2-1, Signalling on low-voltage electrical installations in the frequency range 3 kHz to
148,5 kHz -- Part 2-1: Immunity requirements for mains communications equipment and systems
operating in the range of frequencies 95 kHz to 148,5 kHz and intended for use in residential,
commercial and light industrial environments
EN 50065-2-3, Signalling on low-voltage electrical installations in the frequency range 3 kHz to
148,5 kHz -- Part 2-3: Immunity requirements for mains communications equipment and systems
operating in the range of frequencies 3 kHz to 95 kHz and intended for use by electricity suppliers
and distributors
- 7 - EN 50428:2005
EN 50090-2-2 Home and building electronic systems (HBES) – Part 2-2: System overview –
General technical requirements
EN 55022:1994, Information technology equipment - Radio disturbance characteristics - Limits and
methods of measurement (CISPR 22:1993)
EN 60664-1:2003, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests (IEC 60664-1:1992 + A1:2000 + A2:2002)
EN 60669-1, Switches for household and similar fixed-electrical installations – Part 1: General
requirements (IEC 60669-1)
EN 60669-2-1, Switches for household and similar fixed electrical installations – Part 2-1: Particular
requirements - Electronic switches (IEC 60669-2-1)
EN 61140:2002, Protection against electric shock - Common aspects for installation and equipment
(IEC 61140:2001)
EN 61558-2-6, Safety of power transformers, power supply units and similar -- Part 2-6: Particular
requirements for safety isolating transformers for general use (IEC 61558-2-6)
ETSI EN 300 220-1, Electromagnetic compatibility and Radio spectrum Matters (ERM);Short Range
Devices (SRD); Radio equipment to be used in the 25 MHz to 1 000 MHz frequency range with
power levels ranging up to 500 mW – Part 1: Technical characteristics and test methods
ETSI EN 300 220-3, Electromagnetic compatibility and Radio spectrum Matters (ERM); Short Range
Devices (SRD); Radio equipment to be used in the 25 MHz to 1 000 MHz frequency range with
power levels ranging up to 500 mW – Part 3: Harmonized EN covering essential requirements under
article 3.2 of the R&TTE Directive
ETSI EN 301 489-3, Electromagnetic compatibility and Radio spectrum Matters (ERM);
Electromagnetic Compatibility (EMC) standard for radio equipment and services – Part 3: Specific
conditions for Short-Range Devices (SRD) operating on frequencies between 9 kHz and 40 GHz
HD 384.4.41 S2:1996, Electrical installations of buildings – Part 4: Protection for safety –
Chapter 41: Protection against electric shock (IEC 60364-4-41:1992, modified)
3 Definitions
This clause of Part 2-1 is applicable with the following additions:
3.201
HBES switch
device using two way communication designed to make or break and/or to control, directly (e.g.
actuator) or indirectly (e.g. sensor), the current in one or more electric circuits. The communication
can use different media e.g. Twisted Pair (TP), Power Line (PL), Infra Red (IR) and Radio
Frequency (RF)
NOTE  To make or break and/or to control directly means that an actuator makes or breaks the current and/or controls the
current.
3.202
ELV
for the purpose of this standard, a voltage not exceeding 50 V a.c. or d.c. between conductors, or in
the case of three-phase circuits, not exceeding 29 V between conductors and neutral, the no-load
voltage of the circuit not exceeding 50 V and 29 V, respectively
NOTE  The use of ELV other than for protection by SELV or PELV in such circuits is not a protective measure.
3.203
SELV system
an electrical system in which the voltage cannot exceed ELV
- under normal conditions
- under single fault conditions, including earth faults in other circuits

3.204
PELV system
an electrical system in which the voltage cannot exceed ELV
- under normal conditions
- under single fault conditions, except earth faults in other circuits
3.205
simple separation
separation between circuits or between a circuit and earth by means of basic insulation
3.206
protective separation
separation of one electric circuit from another by means of
- double insulation, or
- basic insulation and protective screening, or
- reinforced insulation
3.207
basic insulation
insulation of hazardous-live-parts which provides basic protection
NOTE  This concept does not apply to insulation used exclusively for functional purposes. [IEV 195-06-06].
3.208
supplementary insulation
independent insulation applied in addition to basic insulation, for fault protection [IEV 195-06-07]
3.209
double insulation
insulation comprising both basic insulation and supplementary insulation [IEV 195-06-08]
3.210
reinforced insulation
insulation of hazardous-live-parts which provides a degree of protection against electric shock
equivalent to double insulation
NOTE  Reinforced insulation may comprise several layers which cannot be tested singly as basic insulation or
supplementary insulation [IEV 195-06-09]
4 General requirements
This clause of Part 2-1 is applicable.
5 General notes on tests
This clause of Part 2-1 is applicable.
6 Ratings
This clause of Part 2-1 is applicable except as follows.
Addition:
The ELV is limited to 50 V a.c. and 50 V d.c.
NOTE  For three phase circuits see 3.202.

- 9 - EN 50428:2005
7 Classification
This clause of Part 2-1 is applicable except as follows.
Replacement of 7.1.5 of Part 2-1 by:
7.1.5 Addition:
– touch;
– proximity;
– optical;
– acoustic;
– other external influences e.g. communication system.
NOTE  Actuating the electronic switch includes on/off operation, and/or regulating the brightness of lamps or speed of
motors.
Replacement of 7.1.8 of Part 1 by:
7.1.8 according to the wiring connection:
– switches with screw-type terminals;
– switches with screwless terminals for rigid conductors only;
– switches with screwless terminals for rigid and flexible conductors;
– switches without terminals equipped with connecting leads.
Addition:
7.1.201 according to the presence of SELV or PELV part:
– switches with SELV or PELV parts only,
– switches without SELV or PELV parts,
– switches having a combination of parts connected to the mains and SELV or PELV parts.
8 Marking
This clause of Part 2-1 is applicable.
9 Checking of dimensions
This clause of Part 2-1 is applicable.
10 Protection against electric shock
This clause of Part 2-1 is applicable except as follows.
Addition:
10.201 Live parts of SELV or PELV circuits shall be electrically separated from each other and
from other circuits by simple or protective separation as given in Clause 23.
SELV / PELV is 50 V a.c. or d.c. max under no fault and one single fault condition.
In addition, if the SELV / PELV is higher than 25 V a.c protection against direct contact shall be
provided by:
– barriers or enclosures giving at least the degree of protection IP2X or IPXXB or
– insulation capable of withstanding a test voltage of 500 V a.c. for 1 min (see HD 384.4.41 S2
Subclause 411.1.4.3).
In wet conditions the value is reduced to 6 V a.c. or 15 V d.c. (ripple free).
Compliance is checked by the requirements and the tests of Clauses 16 and 23.
11 Provision for earthing
This clause of Part 2-1 is applicable.
12 Terminals
This clause of Part 1 is applicable except as follows.
12.1 Addition after the 1st paragraph:
The connecting capability of terminals for circuits other than those of the main circuit needs not to
be in relation with the rated current of the HBES switch. This means that these terminals need not
necessarily to have the same connecting capability as the mains terminals of the HBES switch.
Terminals for conductors lower than 0,5 mm shall fulfil the requirements of EN 60998-1.
13 Constructional requirements
This clause of Part 2-1 is applicable except as follows.
Modification of Table 11 of Subclause 13.3.2 of Part 1:
Table 11 – Forces to be applied to covers, cover-plates or actuating members
whose fixing is not dependent on screws
Force to be applied
N
Accessibility with the test finger Test Switches complying with Switches not complying
after removal of covers, cover according 20.7 and 20.8 with 20.7 and 20.8
plates or parts of them to
Shall not Shall Shall not Shall
come off come off come off come off
To live parts 20.4 40 120 80 120
To non-earthed metal parts separated
from live parts by creepage distances 20.5 10 120 20 120
according to Table 20
To insulating parts, earthed metal
parts, the live parts of SELV or metal
parts separated from live parts by
20.6 10 120 10 120
creepage distances and by
clearances twice those according to
Table 20
14 Mechanism
This clause of Part 2-1 is applicable.
15 Resistance to ageing, protection provided by enclosures of switches, and
resistance to humidity
This clause of Part 2-1 is applicable.

- 11 - EN 50428:2005
16 Insulation resistance and electric strength
This clause of Part 2-1 is applicable except as follows.
Addition to Table 14:
Table 14 – Test voltage, points of application and minimum values of insulating resistance
for the verification of dielectric strength
9 Between main supply circuits and SELV and PELV  3 750
circuits
10 Between a SELV or PELV circuit below 25 V a.c. 500 500
and a SELV or PELV circuit above 25 V a.c.
11 Between a SELV or PELV circuit above 25 V a.c 500 500
and accessible surfaces (see Clause 10)
12 Between a SELV and PELV circuits  500 500
Only items 9, 10, 11 and 12 are applicable to SELV or PELV parts of HBES switches.
NOTE  Items 1 to 8 are not applicable to SELV or PELV parts of HBES switches
17 Temperature rise
This clause of Part 2-1 is applicable.
NOTE  HBES switches having no load switching means are not subjected to this test.
18 Making and breaking capacity
This clause of Part 2-1 is applicable.
19 Normal operation
This clause of Part 2-1 is applicable.
20 Mechanical strength
This clause of Part 2-1 is applicable.
21 Resistance to heat
This clause of Part 2-1 is applicable.
22 Screws, current-carrying parts and connections
This clause of Part 2-1 is applicable.
23 Creepage distances, clearances and distances through sealing compound
This clause of Part 2-1 is applicable except as follows.
Addition:
This standard is only intended to give requirements for insulation between different electrical parts
to verify insulation conditions between SELV/PELV and other circuits.

23.201 Specification of insulation
In order to achieve the required protective separation the following parameters apply:
a) Overvoltage category: III
Table 201 – Relation between the rated voltage of the HBES switch,
the rated insulation voltage and the rated impulse voltage
Rated voltage of HBES switch (r.m.s.) Rated insulation voltage Rated impulse withstand
voltage
Up to and including 50 V 50 V 800 V
Above 50 V up to and including 250 V 250 V 4 000 V
230/400 V (three phase) 250 V 4 000 V
b) Pollution degree: 2
c) Material class: min.IIIa
NOTE 1  For clarification see EN 60664-1.
NOTE 2  Special precautions should be taken if the products are installed in other places than the ones specified in the
standard (with a pollution degree higher than 2).
23.202 Protective separation between circuits
Arrangements shall ensure protective separation between mains (and other hazardous voltages)
and SELV/PELV circuit.
The protective separation can be achieved by one of the methods given in Figure 201.
NOTE 1  The requirements below are in accordance with EN 61140:2002, Subclauses 6.6 and 6.7 and EN 60664-1:2003.
HBES switches containing hazardous voltages and SELV/PELV circuits shall provide a double or
reinforced insulation for the rated insulation voltage and the rated impulse withstand voltage,
externally (between HBES switches and other circuits outside the HBES switch) and internally
(between the different circuits inside the HBES switch).
NOTE 2  Figure 201a addresses the SELV/PELV part within HBES switches, which are intended to be used either in
SELV/PELV installations or in mains installations, where basic insulation of mains live parts can be expected. Figure 201b
addresses the SELV/PELV part within single mains HBES switches, which are intended to be used in installations, where
hazardous voltages appear (including mains installations).
HBES switches containing only SELV/PELV circuits shall provide a double or reinforced insulation
for the rated insulation voltage and the rated impulse withstand voltage (between SELV/PELV circuit
of the HBES switch and other circuits outside the HBES switch (see Figure 201c) according to
mains 230/400 V environment, unless the usage in an other environment is made clearly visible
either by marking, an instruction sheet or similar means (see Figure 201d).
NOTE 3  Figure 201c addresses SELV/PELV HBES switches, which are intended to be used in installations, where
hazardous voltages appear (including mains installations). Figure 201d addresses SELV/PELV HBES- switches, which are
intended to be used as standalone in SELV/PELV installations. Figure 201e addresses SELV/PELV HBES switches, which
are intended to be used as standalone in mains installation where basic insulation of mains live parts can be expected

- 13 - EN 50428:2005
e)
Methods to achieve protective separation:
SS mains  = simple separation = Basic insulation for rated insulation voltage and for rated
impulse withstand voltage in mains environment according
to Table 201
SS SELV/PELV = simple separation = Basic insulation for rated insulation voltage and for rated
impulse withstand voltage in SELV/PELV environment
according to Table 201
PS mains = protective separation = Double insulation or reinforced insulation for rated insulation
voltage and for rated impulse withstand voltage in mains
environment according to Table 201
RIV = rated insulation voltage
Figure 201 – Protective separation between circuits
23.203 Dimensioning of clearances of basic, double or reinforced insulation between
circuits
Clearances of basic, double or reinforced insulation shall each be dimensioned as specified in
Table 202.
Clearances of basic insulation shall be dimensioned as specified in Table 202 taking into account
that the required impulse withstand voltage is equal to the rated impulse withstand voltage of the
HBES switch (as defined in Table 201).

Clearances through openings in enclosures of insulating material shall not be less than those
specified for inhomogeneous field conditions since the configuration is not controlled, which may
have an adverse effect on the homogeneity of the electric field. (Subclause 3.1.2.1 of
EN 60664-1:2003).
Double insulation consists of basic insulation and supplementary insulation. Each shall be
dimensioned as specified in Table 202.
For HBES switches provided with double insulation where basic insulation and supplementary
insulation cannot be tested separately, the insulation system is considered as reinforced insulation.
Clearances of reinforced insulation shall be dimensioned as specified in Table 2A of
EN 60664-1:2003 taking into account that the required impulse withstand voltage is one step higher
than the rated impulse withstand voltage of the HBES-switch.
Table 202 – Minimum clearances without verification test
Required impulse withstand voltage Minimum clearances without
verification test
V mm
800 0,2
4 000 3,0
6 000 5,5
Compliance is checked by measurements taking into account the figures of Annex BB.
Clearance values (for required impulse withstand voltage = 800 V) shall not be less than the values
given in Table 202.
Clearance values (for required impulse withstand voltage higher than 800 V) smaller than the
prescribed values in Table 202 can be used if the parts are rigid or located by mouldings or if the
construction is such that the distances have no likelihood of being reduced during mounting,
connection and normal use and shall
– not be less than the ones given in Table 204 and
NOTE  When selecting clearances according to Table 204 the requirements of 3.1.1 of EN 60664-1:2003 Influencing
factors need to be taken into account.
– require verification by carrying out the impulse withstand voltage tests in accordance with
EN 60664-1:2003, Subclause 4.1.1.2.1.
Compliance is checked by the following impulse withstand voltage test.
Test voltage = required impulse withstand voltage specified in Table 201 corrected to Table 203.
The test is carried out on the complete assembly as in normal use.
All conductors of the SELV part are connected together, all conductors on the mains part are
connected together.
There will be 6 pulses applied to the equipment, being 3 positive impulses and 3 negative impulses.
The generator output impedance shall not be higher than 500 Ω.
There shall be
– no flash over and
– the waveform of the impulse shall not be distorted (4.1.1.3.4 of EN 60664-1:2003). This means
that the amplitude of the waveform when the impulse is applied to the equipment shall be not less
than 90% of the amplitude of the waveform when the generator is open circuit.

- 15 - EN 50428:2005
Table 203 – Test voltages and corresponding altitudes
Rated impulse Test voltages and corresponding altitudes
withstand voltage
kV kV
Sea level 200 m 500 m 1 000 m 2 000 m
4,0 4,8 4,8 4,7 4,4 4,0
6,0 7,3 7,2 7,0 6,7 6,0
Table 204 – Minimum clearances with verification test
Required impulse withstand voltage Minimum clearances with verification
V mm
4 000 1,2
6 000 2,0
NOTE  The minimum clearances without verification test (see Table 202), are in accordance with EN 60664-1:2003, Table 2
inhomogeneous field. Minimum clearances with verification test (see Table 204), are in accordance with EN 60664-1:2003,
Table 2, homogeneous field.
The clearance between SELV parts and earth shall be at least 0,2 mm.
23.204 Dimensioning of creepage distances of basic, double or reinforced insulation
between circuits
In accordance with EN 60664-1:2003, Subclause 3.2.1.5 a creepage distance cannot be less than
the associated clearance, so the shortest creepage distance possible is equal to the required
clearance.
Creepage distances of basic, supplementary and reinforced insulation shall be selected from
Table 205.
Creepage distances of double insulation are the sum of the values of the basic and supplementary
insulation, which composes the double insulation system.
Table 205 – Minimum creepage distances of basic, supplementary and reinforced insulation
Rated insulation Minimum creepage distance
voltage (r.m.s.)
mm
Basic and supplementary insulation Reinforced insulation
Printed Material Material Material Printed Material Material Material
wiring group I group II group wiring group I group II group
material III material III
Up to and including 50 V 0,2* 0,6 0,85 1,2 N.A. N.A. N.A. N.A.
Above 50 V up to and
3,0* 3,0* 3,0* 3,0* 5,5* 5,5* 5,5* 5,5*
including 250 V
* These cases are limited to these values as a creepage distance should not be less than the associated clearance
N.A: these values are not applicable, as these situations are not mentioned in Figure 201a to 201e.

Compliance is checked by measurements taking into account the figures of Annex BB.
Creepage distances (for rated insulation voltage up to and including 50 V) shall not be less than the
values given in Table 205.
Creepage distances (for rated insulation voltage above 50 V up to and including 250 V) smaller than
the prescribed values in Table 205 shall not be less then the ones given in Table 206.
Table 206 – Minimum creepage distances of basic, supplementary and reinforced insulation
Rated insulation Minimum creepage distance
voltage (r.m.s.) mm
Basic and supplementary insulation Reinforced insulation
Printed Material Material Material Printed Material Material Material
wiring group I group II group wiring group I group II group
material III material III
Above 50 V up to and
1,2* 1,25 1,8 2,5 2,5 2,5 3,6 5,0
including 250 V
* This case is limited to these values as a creepage distance should not be less then the associated clearance
The creepage distance between SELV and earth shall be at least 0,2 mm.
23.205 Solid insulation
The dielectric strength of the solid insulation (if any) of the simple and protective separation between
circuits is covered by Clause 16.
23.206 Protective separation of the supply for the SELV/PELV circuit
According to HD 384.4.41 S2:1996 the protective separation of the supply for the SELV/PELV circuit
shall be at least as good as for safety transformers in accordance with EN 61558-2-6.
23.207 External creepage and clearance distance between clamping units
Terminals for SELV circuits and main circuits intended for external wiring shall be so located that the
external creepage and clearance distance between these clamping units is not less than 10 mm in
order to prevent any loose conductor from touching the other circuit. If that distance is achieved by a
barrier, this barrier shall be of insulating material and be permanently fixed to the switch or only
removable with the aid of a tool for the wiring of the accessory. If the barrier is omitted, the HBES
switch is rendered inoperable or manifestly incomplete.
Compliance is checked by inspection and by measurement disregarding intermediate metal parts.
24 Resistance of insulating material to abnormal heat, to fire and to tracking
This clause of Part 2-1 is applicable.
25 Resistance to rusting
This clause of Part 2-1 is applicable.
26 EMC requirements
Replacement of this clause of part 1 by:
HBES switches shall be designed to operate correctly under the conditions of electromagnetic
environment in which they are intended to be used. This applies particularly for HBES switches
intended to be connected to a.c. low-voltage public supply systems where the design shall take into
account the normal disturbances on the supply system, as defined by the compatibility levels given
in EN 61000-2-2.
The tests are carried out with three new specimens (see Table 101 of Part 2-1).
For HBES switches, the manufacturer shall specify all details related to the load.

- 17 - EN 50428:2005
For HBES switches using RF (Radio Frequency), the RF-requirements of ETSI EN 300 220-1,
ETSI EN 300 220-3 and ETSI EN 301 489-3 apply. For immunity the requirements of Part 2-1 apply
in addition.
For HBES switches using PL (power line) the emission requirements of EN 50065-1 apply. For
immunity the requirements of Part 2-1 and in addition the requirements of EN 50065-2-1 or
EN 50065-2-3, if applicable, may apply.
Compliance is checked by the tests of 26.1 and 26.2.
26.1 Immunity
HBES switches shall be designed so that the switch state (on or off) and/or the setting value are
protected against interference.
For the following tests, the HBES switch is mounted as in normal use in the relevant box, if any, and
loaded with all kinds of loads according to the product specifications, unless otherwise stated in the
relevant paragraph.
The HBES switch is loaded at 100 % of the rated load for dimming devices and with a functional
load for other HBES switches.
All tests shall be done with a minimum HBES configuration. A minimum HBES configuration is a set
of devices which makes it possible to test the proper function of a HBES switch under test (EUT).
The test set-ups are described in Annex CC for HBES switches using TP-Media and PL-Media.
The HBES switch shall be tested according to Table 207 with or without operation as indicated in
the relevant paragraph.
Each HBES switch is tested, if applicable, in the following states:
a) in the on-state
For HBES switches where the setting can alter (e.g. dimming devices) the HBES switch is set
at a firing angle of approx. 90° which results in an output power P (rms).
o
A variation of P less than ± 10 % is not considered to be a change of the setting.
o
b) in the off-state.
Table 207 – Immunity tests (overview)
EM phenomena Test set-up Subclause Test specification
Voltage dips and short EN 61000-4-11 26.1.1 Table 208
interruptions
Surge EN 61000-4-5 26.1.2 Table 209

Fast transients (burst) EN 61000-4-4 26.1.3 Table 210
Level 2
Level 3
Electrostatic discharge EN 61000-4-2 26.1.4 ± 4 kV contact discharge
± 8 kV air discharge
Radiated electromagnetic field test EN 61000-4-3 26.1.5 3 V/m
Radio frequency voltage EN 61000-4-6 26.1.6 3 V r.m.s
a
Power frequency magnetic field EN 61000-4-8 26.1.7 3 A/m, 50 Hz
a
This test is applicable only to HBES switches containing devices susceptible to magnetic fields, for example, Hall
elements, electrodynamic microphones, etc.

26.1.1 Voltage dips and short interruptions
The HBES switch shall be tested with the test equipment specified in EN 61000-4-11 as specified in
26.1, in accordance with Table 208, with a sequence of three dips/interruptions with intervals of 10 s
minimum between each test event.
The test shall be done on the power supply lines of the EUT.
During the test, the device is not operated.
Abrupt changes in supply voltage shall occur at zero crossings.
The output impedance of the test voltage generator shall be low, even during the transition.
The change between the test voltage UT and the changed voltage is abrupt.
NOTE  100 % UT is equal to the rated voltage.
A test level of 0 % corresponds to a total supply voltage interruption.
Table 208 – Voltage dip and short-interruption test values
Test level Voltage dip/interruptions Duration

(number of cycles at rated
% UT
% UT frequency)
0 100 10
40 60 10
70 30 10
During the test the state and setting may alter, flickering is neglected, after the test, the HBES
switch shall be in the original state and setting and shall operate as intended.
26.1.2 Surge immunity test for 1,2/50 wave impulses
HBES switches shall be tested for resistance to unidirectional surges caused by over-voltages from
switching and lightning transients.
During the test, the device is not operated.
The test is carried out according to EN 61000-4-5 by applying
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