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Page 1

BRITISH STANDARD BS EN
3-7:2004
+A1:2007

Portable fire
extinguishers —
Part 7: Characteristics, performance
requirements and test methods

ICS 13.220.10

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Page 2

BS EN 3-7:2004+A1:2007

This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee
on 12 February 2004

© BSI 2008

ISBN 978 0 580 61919 9

National foreword

This British Standard is the UK implementation of EN 3-7:2004+A1:2007. It
supersedes BS 7937:2000 and BS EN 3-7:2004 which are withdrawn.
The start and finish of text introduced or altered by amendment is indicated in
the text by tags. Tags indicating changes to CEN text carry the number of the
CEN amendment. For example, text altered by CEN amendment A1 is
indicated by !".
The UK participation in its preparation was entrusted by Technical Committee
FSH/2, Fire extinguishers, to Subcommittee FSH/2/11, Portable fire
extinguishers.
A list of organizations represented on this subcommittee can be obtained on
request to its secretary.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity from
legal obligations.

Amendments/corrigenda issued since publication

Date Comments

30 April 2008 Implementation of CEN amendment A1:2007 and
revision of supersession details

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Provided by IHS under license with BSI - Uncontrolled Copy

Page 28

26

Annex B
(normative)


Range of operating temperature

NOTE See 7.4.

B.1 Carry out testing on four extinguishers. Before testing, weigh each extinguisher, then subject
two extinguishers to temperature cycle A as given in B.2 and subject the other two extinguishers to temperature
cycle B as given in B.3. Storage at the temperatures given in B.2 and B.3 shall be carried out in conditioning
chambers. Liquid baths shall not be used. Extinguishers shall remain upright during temperature cycling.

B.2 Temperature cycle A. Store the extinguisher, at each of the following temperatures in succession for
(24 � 1) h:

� (Tmin � 2) °C, as specified in 7.4.2;

� (+ 20 � 5) °C;

� (Tmax � 2) °C.

B.3 Temperature cycle B. Store the extinguisher, at each of the following temperatures in succession for
24 h ± 1 h:

� (Tmax � 2) °C;

� (+ 20 � 5) °C;

� (Tmin � 2) °C, as specified in 7.4.2.

B.4 Operate the extinguisher within 1 min of its removal from the conditioning chamber. The extinguisher shall be
operated in accordance with 7.3, except for cartridge type extinguishers where activation is by a single action. In
this case the cartridge shall be opened and the control valve closed immediately for a period of 6 s after which the
control valve shall be reopened.

B.5 Measure and record the time between the opening of the final control valve and the commencement of
discharge. Measure and record the duration of operation.

B.6 For gaseous extinguishers: reweigh, calculate and record the residual charge. For all other extinguishers:
reweigh, empty the residual extinguishant, reweigh or measure and record it.

BS EN 3-7:2004+A1:2007

Copyright British Standards Institution
Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Middle East & Africa 2
/5947185149, User=Manjeri, Umesh

Not for Resale, 01/10/2017 21:05:16 MSTNo reproduction or networking permitted without license from IHS

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Page 29

27

Annex C
(normative)


Dielectric test

NOTE See clause 9.

C.1 Apparatus

C.1.1 A metallic plate, the target, (1 � 1) m, hung vertically by insulators and with no object or structure closer
than:

� 1 m below the bottom of the plate;

� 1 m either side of the edges of the plate;

� 1 m from either face of the plate;

� 0,5 m above the top of the plate.

C.1.2 A trough or other container, arranged below the target plate to collect any liquid run off from the plate
and insulated from earth.

C.1.3 A high voltage transformer, enabling an alternating voltage of 35 kV to be established between the
metallic plate and earth.

The impedance of the circuit shall be such that, when the secondary is short circuited and the primary supplied by a
voltage equal to 10 % of its normal supply voltage, the secondary current is not less than 0,1 mA.

C.1.4 An insulating support, (for fixed nozzle extinguishers).

C.1.5 An insulating tray, (for extinguishers fitted with a hose).

C.2 Test procedure

The apparatus shall be set up according to the arrangement shown in Figure C.1.

A fixed nozzle type extinguisher shall be fixed onto the insulating support and so arranged that the discharge outlet,
situated at 1 m from the metallic plate, the target, is directed towards its centre.

An extinguisher with a hose shall be placed on the insulating tray and so arranged that the discharge outlet is 1 m
from the target plate and directed towards its centre.

The current shall be measured by an ammeter connected in turn between the handle of the extinguisher and earth
and between the nozzle and earth. If no complete metallic path exists between the extinguishing media and at least
one of the above connection points to the measuring device, such a path shall be created for the purpose of the
test.

Discharge the extinguisher, ensuring that the discharged medium contacts the target, and measure and record the
current.

BS EN 3-7:2004+A1:2007

Copyright British Standards Institution
Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Middle East & Africa 2
/5947185149, User=Manjeri, Umesh

Not for Resale, 01/10/2017 21:05:16 MSTNo reproduction or networking permitted without license from IHS

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Page 55

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Page 56

BS EN
3-7:2004
+A1:2007

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