SIST EN 50425:2008

SLOVENSKI STANDARD
SIST EN 50425:2008
01-april-2008
6WLNDOD]DJRVSRGLQMVWYDLQSRGREQHQHSUHPLþQHHOHNWULþQHLQãWDODFLMH
6SUHPOMHYDOQLVWDQGDUG6WLNDOD]DJDVLOFH]D]XQDQMHLQQRWUDQMH]QDNHLQVYHWLONH
Switches for household and similar fixed electrical installations - Collateral standard -
Fireman's switches for exterior and interior signs and luminaires
Schalter für Haushalt und ähnliche ortsfeste elektrische Installationen - Kollaterale Norm
- Feuerwehrschalter für äußere und innere Anzeigen und Leuchten.
Interrupteurs pour installations électriques fixes domestiques et analogues – Norme
collatérale – Interrupteurs pompiers pour enseignes lumineuses et luminaires extérieurs
et intérieurs
Ta slovenski standard je istoveten z: EN 50425:2008
ICS:
13.220.99 Drugi standardi v zvezi z Other standards related to
varstvom pred požarom protection against fire
29.120.40 Stikala Switches
SIST EN 50425:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 50425:2008

---------------------- Page: 2 ----------------------

SIST EN 50425:2008


EUROPEAN STANDARD
EN 50425

NORME EUROPÉENNE
February 2008
EUROPÄISCHE NORM

ICS 29.120.40


English version


Switches for household and similar fixed electrical installations -
Collateral standard -
Fireman's switches for exterior and interior signs and luminaires



Interrupteurs pour installations électriques Schalter für Haushalt und ähnliche
fixes domestiques et analogues - ortsfeste elektrische Installationen -
Norme collatérale - Kollaterale Norm -
Interrupteurs pompiers Feuerwehrschalter für äußere
pour enseignes lumineuses und innere Anzeigen und Leuchten
et luminaires extérieurs et intérieurs





This European Standard was approved by CENELEC on 2007-10-01. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the 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


© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50425:2008 E

---------------------- Page: 3 ----------------------

SIST EN 50425:2008
EN 50425:2008 – 2 –
Foreword
This European Standard has been prepared by the Technical Committee CENELEC TC 23BX,
D.C. plugs and socket outlets and 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 50425 on 2007-10-01.
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) 2008-10-01

– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-10-01
This European Standard has to be used in conjunction with EN 60669-1:1999 Switches for
household and similar fixed-electrical installations - Part 1: General requirements. It lists the
additional changes necessary to convert it into the European Standard Switches for household
and similar fixed electrical installations - Collateral standard – Fireman’s switches for exterior and
interior signs and luminaries.
When this standard states ‘addition’, ‘modification’ or ‘replacement’ to Part 1, the relevant text of
EN 60669-1:1999 is to be adapted accordingly.
NOTE  The subclauses, tables and figures that are numbered starting from 101 are additional to those in
EN 60669-1:1999.

---------------------- Page: 4 ----------------------

SIST EN 50425:2008
– 3 – EN 50425:2008
1 Scope
This clause of Part 1 applies with the following modifications:
Replacement of the first paragraph:
This collateral standard applies to fireman's switches used for the breaking of the low voltage
circuits for exterior and interior signs and luminaires e.g. neon signs for a.c. only with a rated
voltage not exceeding 440 V and a rated current not exceeding 125 A.
NOTE 1  The working voltage for the signs and luminous-discharge-tube installations is higher than 1 kV but lower than
10 kV and these should be in accordance with EN 50107 series.
Renumbering of the subsequent notes.
th
Replacement of the 6 paragraph and the new Note 6 by:
Fireman’s switches complying with this standard are suitable for use between –20 °C and +70 °C.
NOTE 6  Fireman’s switches are designed for overvoltage category III and used in environment of pollution degree 2
according to EN 60664-1.
2 Normative references
See Annex ZA.
3 Definitions
This clause of Part 1 applies with the following addition:
Additional new definition:
3.101
fireman’s switch
switch for emergency disconnection of lighting installations
4 General requirements
This clause of Part 1 applies.
5 General notes on tests
This clause of Part 1 applies.
6 Ratings
This clause of Part 1 applies with the following modifications:
6.2 Deletion in the first paragraph of the values "6 A" and "10 A"
Addition of the values “80 A, 100 A and 125 A.”

---------------------- Page: 5 ----------------------

SIST EN 50425:2008
EN 50425:2008 – 4 –
7 Classification
This clause of Part 1 applies except as follows.
7.1.1
Addition at the end:
Fireman’s switches shall be only of pattern number 2, 3 or 03.
7.1.2 This subclause of Part 1 is not applicable.
7.1.4
Replacement:
7.1.4 according to the degree of protection against harmful effects due to the ingress of water:
– IPX5: switches protected against water jets;
– IPX6: switches protected against powerful water jets.
NOTE  For an explanation of IP codes, see EN 60529.
7.1.5
Replacement:
7.1.5 according to the method of actuating the switch:
– tumbler.
NOTE  No other actuating method is permitted.
7.1.6
Replacement:
7.1.6 according to the method of mounting the switch:
– surface-type;
– semi flush-type.
NOTE  No other method of mounting is permitted.
7.1.9
Replacement:
7.1.9 according to the degree of protection against access to hazardous parts and against
harmful effects due to the ingress of solid foreign objects
– IP5X: switches protected against access to hazardous parts with a wire and dust-protected;
– IP6X: switches protected against access to hazardous parts with a wire and dust-tight.
7.2 Replacement in Table 1, first column, last line, of the values “16, 20, 25, 32, 40, and 63” by
“equal to and above 16”.

---------------------- Page: 6 ----------------------

SIST EN 50425:2008
– 5 – EN 50425:2008
8 Marking
This clause of Part 1 applies except as follows.
8.1 Replacement of the first dash with:
– rated current in amperes (A);
Addition:
– symbols IEC 60417-5007 and IEC 60417-5008 respectively for open position (OFF) and
closed position (ON),
8.3 Addition:
The following information shall be distinctly and durably marked on the fireman's switch in a
position where it can be clearly seen without opening the enclosure and when the switch is
installed:
– 'I' and 'O' symbols not less than 10 mm high;
– letters reading NEON in letters not less than 15 mm high.
8.6 Deletion of Note 1.
9 Checking of dimensions
This clause of Part 1 applies.
10 Protection against electric shock
This clause of Part 1 applies.
11 Provision for earthing
This clause of Part 1 applies.

---------------------- Page: 7 ----------------------

SIST EN 50425:2008
EN 50425:2008 – 6 –
12 Terminals
This clause of Part 1 applies except as follows:
Replacement of Table 2 by the following new table:
Table 2 – Relationship between rated currents and connectable cross-sectional areas
of copper conductors for screw type terminals
a
Ranges of rated currents Rigid conductors (solid or stranded)
Nominal cross-sectional areas Diameter of largest conductor
A
2
mm mm
b
16 From  1,5  up to  4 inclusive 2,72
Above 16 up to and including 25 From  2,5  up to  6 inclusive 3,34
Above 25 up to and including 32 From  4   up to 10 inclusive 4,34
Above 32 up to and including 50 From  6   up to 16 inclusive 5,46
Above 50 up to and including 80 From 10   up to 25 inclusive 6,85
Above 80 up to and including 100 From 16   up to 35 inclusive 7,90
Above 100 up to and including 125 From 25   up to 50 inclusive 9,10
a
 The use of flexible conductors is permitted.
b
 Each supply terminal of fireman’s switches, other than those of pattern numbers 3 and 03, shall allow the connection
2
of two 2,5 mm conductors. For fireman’s switches having a rated voltage not exceeding 250 V a round hole is
2
sufficient for the connection of two 2,5 mm conductors.

---------------------- Page: 8 ----------------------

SIST EN 50425:2008
– 7 – EN 50425:2008
12.2.5 Replacement of Table 3 by the following new table:
Table 3 – Tightening torque for verification of the mechanical strength
of screw-type terminals
Nominal diameter of thread Torque
mm Nm
1 2 3 4 5
Up to and including 1,6 0,05 – 0,1 0,1 –
Above 1,6 up to and including 2,0 0,1 – 0,2 0,2 –
Above 2,0 up to and including 2,8 0,2 – 0,4 0,4 –
Above 2,8 up to and including 3,0 0,25 – 0,5 0,5 –
Above 3,0 up to and including 3,2 0,3 – 0,6 0,6 –
Above 3,2 up to and including 3,6 0,4 – 0,8 0,8 –
Above 3,6 up to and including 4,1 0,7 1,2 1,2 1,2 1,2
Above 4,1 up to and including 4,7 0,8 1,2 1,8 1,8 1,8
Above 4,7 up to and including 5,3 0,8 1,4 2,0 2,0 2,0
Above 5,3 up to and including 6,0 1,2 1,8 2,5 3,0 3,0
Above 6,0 up to and including 8,0 2,5 2,5 3,5 6,0 4,0
Above 8,0 up to and including 10,0 – 3,5 4,0 10,0 6,0
Above 10,0 up to and including 12,0 – 4,0 – – 8,0
Above 12,0 up to and including 15,0 – 5,0 – – 10,0
NOTE 1 Column 1 applies to screws without heads if the screw when tightened does not protrude from the hole, and
to other screws which cannot be tightened by means of a screwdriver with a blade wider than the diameter of the screw.
Column 2 applies to nuts of mantle terminals which are tightened by means of a screwdriver.
Column 3 applies to other screws which are tightened by means of a screwdriver.
Column 4 applies to nuts of mantle terminals in which the nut is tightened by means other than a screwdriver.
Column 5 applies to screws or nuts, other than nuts of mantle terminals, which are tightened by means other than a
screwdriver.
Where a screw has a hexagonal head with a slot for tightening with a screwdriver and the values of columns 3 and 5
are different, the test is made twice, first applying to the hexagonal head the torque specified in column 5 by means
other than a screwdriver and then applying the torque specified in column 3 by means of a screwdriver. If the values of
columns 3 and 5 are the same, only the test with the screwdriver is made.
NOTE 2 For mantle terminals the specified nominal diameter is that of the slotted stud.
NOTE 3 The shape of the blade of the test screwdriver should suit the head of the screw to be tested.
NOTE 4 The screws and nuts should not be tightened in jerks.

---------------------- Page: 9 ----------------------

SIST EN 50425:2008
EN 50425:2008 – 8 –
Replacement of Table 4 by the following new table:
Table 4 – Test values for flexion and pull-out for copper conductors
b

Conductor Diameter Height H Mass
 a
for conductor
cross-sectional area of bushing hole mm
2
mm mm kg
1,5 6,5 260 0,4
2,5 9,5 280 0,7
4,0 9,5 280 0,9
6,0 9,5 280 1,4
10,0 9,5 280 2,0
16,0 13,0 300 2,9
25,0 13,0 300 4,5
35,0 14,5 320 6,8
50,0 16,0 340 9,5
a
 If the bushing hole diameter is not large enough to accommodate the conductor without binding, a bushing having
the next larger hole size may be used.
b
 Tolerance for height H = ±15 mm.

12.2.6 Replacement of Table 5 by the following new table:
Table 5 – Test values for pull-out test
Cross-
sectional
area of
From 1,5 From 2,5 From 4 From 6 From 10 From 16 From 25 From 35
conductors
up to 2,5 up to 4 up to 6 up to 10 up to 16 up to 25 up to 35 up to 50
accepted by
inclusive inclusive inclusive inclusive inclusive inclusive inclusive inclusive
the terminal
2
mm
Pull 50 50 60 80 90 100 190 235
N

12.2.7 Replacement of Table 6 by the following new table:
Table 6 – Composition of conductors
Number of wires and nominal diameter of wires
Cross-sectional area
mm
2
mm
Solid conductor Stranded conductor
1,5
1 × 1,38 7 × 0,52
2,5 1 × 1,78 7 × 0,67
4,0 1 × 2,25 7 × 0,86
6,0
1 × 2,76 7 × 1,05
10,0
1 × 3,57 7 × 1,35
16,0 –
7 × 1,70
25,0 – 7 × 2,14
35,0 – 7 × 2,53
50,0 –
19 × 1,83

---------------------- Page: 10 ----------------------

SIST EN 50425:2008
– 9 – EN 50425:2008
12.3.2 Replacement of Table 7 by the following new table:
Table 7 – Relationship between rated currents and connectable cross-sectional areas
of copper conductors for screwless terminals
Conductors
Rated current Nominal cross-sectional Diameter of largest rigid Diameter of largest
areas conductor flexible conductor
2
A mm mm mm
a
16 1,5 to 2,5 2,13 2,21
a
Each supply terminal of fireman’s switches other than those of pattern numbers 3 and 03 shall allow the
2
connection of two 2,5 mm conductors. In such cases a terminal with separate independent clamping means
for each conductor shall be used.

12.3.11 Replacement of Table 8 by the following new table:
Table 8 – Test current for the verification of electrical and thermal stresses
in normal use of screwless terminals
Rated current Test current Cross-sectional area
 of the conductor
2
A A mm
16 22 2,5

12.3.12 Replacement of Tables 9 and 10 by the following new tables:
Table 9 – Cross-sectional areas of rigid copper conductors
for deflection test of screwless terminals
Rated current of the fireman’s Cross-sectional area of the test conductor
2
switch mm
1st test sequence 2nd test sequence
A
16 1,5 2,5

Table 10 – Deflection test forces

a
Cross-sectional area of the test conductor Force for deflecting the test conductor
2
mm
N
1,5 0,5
2,5 1,0
a
The forces are chosen so that they stress the conductors close to the limit of elasticity.

13 Constructional requirements
This clause of Part 1 applies except as follows.
13.9 This subclause is not applicable.

---------------------- Page: 11 ----------------------

SIST EN 50425:2008
EN 50425:2008 – 10 –
13.15.1 Replacement of the fifth paragraph with:
The fireman’s switches are then placed for 2 h in a heating cabinet as described in 15.1, the
temperature being maintained at 70 °C ± 2 °C.
Additional subclauses:
13.101 Actuating handle
Once installed, the handle off position shall be in the vertical position (± 15°) and the handle on
position shall be 80° (+ 15°) from the handle off position.
NOTE 1 The on position means powered and the off position means unpowered.
NOTE 2 The off position of the handle (vertically up or vertically down) may be specified in National Wiring Regulations.
Compliance is checked by inspection and measurements.
13.102 Functional specifications
The actuating handle shall be easy to identify and the length of the actuating handle shall be not
less than 30 mm. The length is the length of protrusion from enclosure in the on position.
If the actuating handle has a ring, the minimum internal diameter of that ring shall be 15 mm.
Compliance is checked by measurement.
13.103 Operating forces
The force to operate the switch shall be between 10 N and 50 N.
The effort is applied at the end of the actuating handle or using the ring, if any.
Compliance is checked by measurement after the mechanism is operated 5 times.
After the test the specimen shall show no damages which may impair its further use.
13.104 Enclosure access
Access to live parts shall be openable only by means of a tool in the off position.
...