FprEN 521

Specifications for dedicated liquefied petroleum gas appliances - Portable vapour pressure liquefied petroleum gas appliances

This document specifies the construction and performance characteristics related to safety and the rational use of energy of portable appliances burning liquefied petroleum gases at the vapour pressure within the gas cartridge or gas cylinder, excepting those where the gas cartridge is inserted horizontally in the chassis.
NOTE   These appliances are referred to in the body of the text as "appliances".
This document applies to various types of portable appliances burning liquefied petroleum gases at vapour pressure and designed to be used with cartridges as complying with EN 417 or gas cylinders.
This document covers appliances for outdoor or in well ventilated areas uses only.
For example the following types of appliances are covered:
a)   cooking appliances (stoves, grills, barbecues...);
This document does not cover barbecues that can be used indoors;
b)   lighting appliances;
c)   heating appliances;
This document only applies to appliances with a maximum heat input of up to 3 kW (Hs) for outdoor use only;
d)   blowtorches;
This document only applies to blowtorches without a flexible hose;
e)   laboratory burners.
The requirements apply to these appliances or their functional sections whether or not the latter are independent or incorporated into an assembly.
Appliances covered by this document are not connected to a flue for the discharge of products of combustion and are not connected to the mains electricity supply.
This document covers neither appliances supplied with LPG in the liquid phase nor appliance with fixed integral container which may or may not be refilled by the user
It does not apply to lighters as defined in EN ISO 9994.
It does not apply to gas appliances operating with a valve cartridge which is horizontally integrated into the chassis of the appliance also called "flat portable gas stove".
Requirements for rational use of energy have been included for stove burners.
However, such requirements have not been included for the other types of appliances because:
-   for grills and barbecues, this is a type of cooking which is achieved by various means such as radiant elements; in addition this type of cooking varies according to the type of food and region where the appliance is used;
-   for lighting appliances, the consumption is insignificant because these appliances have a very low rate and are used only for a few hours in a year;
-   for heating appliances, all the heat produced is discharged into the environment;
-   for tools such as blowtorches which are not professional tools in regular use, the gas consumption depends very much on the way it is used.

Festlegungen für Flüssiggasgeräte - Tragbare, mit Dampfdruck betriebene Flüssiggasgeräte

Dieses Dokument legt die Konstruktions- und Leistungsmerkmale hinsichtlich Sicherheit und wirtschaftlicher Energienutzung tragbarer Geräte fest, die Flüssiggase bei Dampfdruck innerhalb der Gaskartusche oder der Gasflasche verbrennen, ausgenommen die Fälle, in denen die Gaskartusche horizontal in das Gehäuse eingebaut wird.
ANMERKUNG Diese Geräte werden im gesamten Text als „Geräte“ bezeichnet.
Dieses Dokument bezieht sich auf verschiedene Arten tragbarer Geräte, die Flüssiggase bei Dampfdruck verbrennen, die mit Kartuschen (die der EN 417 entsprechen) oder Gasflaschen betrieben werden.
Dieses Dokument behandelt nur Geräte, die für die Verwendung im Freien oder in gut belüfteten Bereichen bestimmt sind.
Beispielsweise gehören dazu folgende Geräte:
a) Kochgeräte (Kocher, Grills, Bratgeräte ...);
Dieses Dokument betrifft nicht Bratgeräte für Innenräume;
b) Leuchtgeräte;
c) Heizgeräte;
Dieses Dokument gilt nur für Heizgeräte mit einer maximalen Wärmebelastung bis zu 3 kW (Hs) und ausschließlich zur Benutzung im Freien;
d) Lötlampen;
Dieses Dokument gilt nur für Lötlampen ohne Schlauchleitung;
e) Laborbrenner.
Die Anforderungen gelten für diese Geräte und deren funktionale Bauteile, unabhängig davon, ob letztere unabhängig oder in eine Baugruppe eingebaut sind.
Durch dieses Dokument sind nur Geräte abgedeckt, die nicht an Abgasleitungen zur Abführung der Verbrennungsprodukte und nicht an das elektrische Netz angeschlossen sind.
Dieses Dokument bezieht sich weder auf Geräte, die mit Flüssiggas in flüssiger Phase versorgt werden, noch auf Geräte mit fest eingebautem, durch den Anwender nachfüllbaren oder nicht nachfüllbaren Gasbehälter.
Es ist nicht auf die in der Norm EN ISO 9994 festgelegten Feuerzeuge anwendbar.
Es gilt nicht für Gasgeräte, die mit einer horizontal in das Gehäuse des Geräts eingebauten Ventilkartusche, auch bezeichnet als „flacher tragbarer Gaskocher“, betrieben werden.
Die Anforderungen an die wirtschaftliche Nutzung der Energie wurden in Hinblick auf die Brenner der Kocher berücksichtigt.
Dagegen wurden derartige Forderungen nicht für die anderen Gerätearten festgelegt, denn:
— für Grills und Bratgeräte wird das Kochergebnis durch verschiedene Mittel, wie strahlende Teile, realisiert; das Kochergebnis ist je nach Art der Nahrung und der Region, in der das Gerät eingesetzt wird, unterschiedlich;
— für Leuchtgeräte, die nur sehr geringen Durchsatz haben und nur wenige Stunden des Jahres benutzt werden, ist der Verbrauch vernachlässigbar;
— für Heizgeräte wird die gesamte Wärme auf die Umgebung übertragen;
— für Werkzeuge, wie Lötlampen, die nicht berufsmäßig ständig benutzt werden, hängt der Gasverbrauch sehr von der Arbeitsweise des Betreibers ab.

Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés - Appareils portatifs alimentés à la pression de vapeur des gaz de pétrole liquéfiés

Le présent document définit les caractéristiques de construction et de fonctionnement liées à la sécurité et à l’utilisation rationnelle de l’énergie des appareils portatifs utilisant des gaz de pétrole liquéfiés à la pression de vapeur des cartouches ou récipients de gaz, à l’exception de ceux dont la cartouche est insérée horizontalement dans le châssis.
NOTE Ces appareils portatifs sont désignés dans l’ensemble du texte par « appareils ».
Le présent document s’applique aux différents types d’appareils portatifs utilisant des gaz de pétrole liquéfiés à la pression de vapeur et conçus pour être utilisés avec des cartouches (conformes à l’EN 417) ou avec des récipients de gaz.
Le présent document couvre les appareils pour utilisation en plein air ou dans des espaces bien aérés uniquement.
Sont par exemple visés les types d’appareils suivants :
a) appareils de cuisson (réchauds, grilloirs, barbecues…) ;
Le présent document ne s’applique pas aux barbecues utilisables dans des locaux.
b) appareils d’éclairage ;
c) appareils de chauffage ;
Le présent document ne s’applique qu’aux appareils de chauffage ayant une puissance calorifique maximale de 3 kW (Hs) et utilisables exclusivement en plein air.
d) appareils de brasage ;
Seuls les appareils de brasage sans tuyau souple sont couverts par le présent document.
e) brûleurs de laboratoire.
Les exigences s’appliquent à tous ces appareils ou éléments, que ces derniers soient indépendants ou incorporés dans un ensemble.
Les appareils couverts par le présent document ne sont pas raccordés à un conduit d’évacuation des produits de la combustion et n’ont pas de raccordement au réseau électrique.
Le présent document ne s’applique ni aux appareils alimentés aux GPL en phase liquide ni à ceux avec réservoir fixe incorporé remplissable ou non par l’utilisateur.
Il ne s’applique pas non plus aux briquets définis dans l’EN ISO 9994.
Il ne s’applique pas aux appareils fonctionnant avec une cartouche qui est incorporée horizontalement dans le châssis de l’appareil, aussi appelés « réchauds à gaz portatifs plats ».
Des exigences concernant l’utilisation rationnelle de l’énergie ont été définies pour les brûleurs de réchaud.
En revanche, de telles exigences n’ont pas été fixées pour les autres types d’appareils, car :
— pour les grilloirs et les barbecues, la qualité de cuisson est obtenue par différents moyens tels que des éléments rayonnants, laquelle qualité de cuisson varie par ailleurs en fonction du type d’aliment et des régions où l’appareil est utilisé ;
— pour les appareils d’éclairage, la consommation est insignifiante, car ces appareils ont un débit très faible et ne sont utilisés que quelques heures dans l’année ;
— pour les appareils de chauffage, toute la chaleur produite est transmise dans l’environnement ;
— pour les outils tels que les lampes à souder, qui ne sont pas des outils professionnels utilisés en permanence, la consommation de gaz dépend beaucoup des habitudes de travail de l’utilisateur.

Specifikacije za plinske aparate na utekočinjeni naftni plin - Prenosni aparati, ki delujejo s tlakom uparjenega plina

General Information

• Status: Not Published
• Publication Date: 17-Mar-2024
• ICS: 27.060.20 - Gas fuel burners
• Technical Committee: CEN/TC 181 - Dedicated liquified petroleum gas appliances
• Drafting Committee: CEN/TC 181/WG 1 - Flueless space heaters
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 18-Sep-2023
• Due Date: 15-Sep-2023
• Completion Date: 18-Sep-2023
• Directive: 2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC
• Mandate: M/595 - [C(2023)4789] - Commission Implementing Decision of 20.7.2023 on a standardisation reques as regards gas appliances and fittings in support of Regulation (EU) 2016/426 of the European Parliament and of the Council
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: oSIST prEN 521:2022 - Specifications for dedicated liquefied petroleum gas appliances - Portable vapour pressure liquefied petroleum gas appliances

Relations

• Revises: EN 521:2019+AC:2019 - Specifications for dedicated liquefied petroleum gas appliances - Portable vapour pressure liquefied petroleum gas appliances
• Effective Date: 19-Jan-2023

Overview

FprEN 521 - Specifications for dedicated liquefied petroleum gas appliances (portable vapour pressure LPG appliances) is a CEN draft standard that defines construction, performance and safety requirements for portable appliances burning liquefied petroleum gas (LPG) at the vapour pressure of the cartridge or cylinder. The standard applies to outdoor or well‑ventilated use and to appliances designed for use with gas cartridges complying with EN 417 or with gas cylinders. Examples covered include cooking appliances (stoves, grills, barbecues for outdoor use), lighting appliances, small heating appliances (up to 3 kW Hs for outdoor use), blowtorches without flexible hose, and laboratory burners.

Key topics and technical requirements

• Scope and exclusions: Vapour‑pressure LPG appliances only; excludes liquid‑phase LPG supply, appliances with fixed integral containers, flat portable gas stoves (horizontal cartridges), lighters (EN ISO 9994), flue‑connected or mains‑powered appliances.
• Safety requirements (Clause 5): Design measures to prevent incorrect fitting of removable parts; combustion safety and CO emission limits; material durability under mechanical, chemical and thermal stresses.
• Tests and verification (Clause 6): Defined test methods for performance, burner adjustment, flame supervision, needle valves, and other fittings; normative test vessel and valve test annexes.
• Classification: Gas categories by vapour pressure (butane, butane‑propane mixture, propane) and appliance categories matched to these gases.
• Marking and instructions (Clauses 7–8): Required product markings, user instructions, maintenance and assembly guidance to ensure safe operation and correct cartridge/cylinder use.
• Rational use of energy: Energy efficiency requirements included for stove burners; other appliance types are exempted for reasons explained in the scope (e.g., variable cooking methods, low use of lighting appliances).
• Supporting material: Annexes A–C (test vessels, needle valve tests, example solutions) and an informative Annex ZA mapping the standard to EU Regulation (EU) 2016/426.

Applications and who uses it

• Manufacturers and designers: To design compliant portable LPG appliances, select materials, and integrate flame supervision and safety fittings.
• Test laboratories and conformity assessors: To perform the specified tests, verify performance and safety, and support CE marking aligned with EU Regulation (EU) 2016/426.
• Regulators, importers and retailers: For product compliance checks and to ensure appliances are intended only for outdoor or well‑ventilated use.
• Product documentation authors: To prepare required markings, user instructions and maintenance information.

Related standards

• EN 417 (gas cartridges)
• EN 437 (test gases and pressures)
• EN 125 (thermoelectric flame supervision devices)
• EN 549 (rubber materials for seals)
• Draft EN 30-1-1 (domestic cooking appliance safety) and EU Regulation (EU) 2016/426

Keywords: FprEN 521, portable vapour pressure liquefied petroleum gas appliances, LPG appliances, EN 417, outdoor cooking appliances, safety requirements, rational use of energy, CEN.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2022
Specifikacije za plinske aparate na utekočinjeni naftni plin - Prenosni aparati, ki
delujejo s tlakom uparjenega plina
Specifications for dedicated liquefied petroleum gas appliances - Portable vapour
pressure liquefied petroleum gas appliances
Festlegungen für Flüssiggasgeräte - Tragbare, mit Dampfdruck betriebene
Flüssiggasgeräte
Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés
- Appareils portatifs alimentés à la pression de vapeur des gaz de pétrole liquéfiés
Ta slovenski standard je istoveten z: prEN 521
ICS:
27.060.20 Plinski gorilniki Gas fuel burners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 521
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2022
ICS Will supersede EN 521:2019+AC:2019
English Version
Specifications for dedicated liquefied petroleum gas
appliances - Portable vapour pressure liquefied petroleum
gas appliances
Spécifications pour les appareils fonctionnant Festlegungen für Flüssiggasgeräte - Tragbare, mit
exclusivement aux gaz de pétrole liquéfiés - Appareils Dampfdruck betriebene Flüssiggasgeräte
portatifs alimentés à la pression de vapeur des gaz de
pétrole liquéfiés
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 181.
If this draft becomes a European Standard, CEN 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.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 521:2022 E
worldwide for CEN national Members.

prEN 521:2022 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 5
3 Terms and definitions . 5
4 Classification. 9
5 Safety requirements . 10
6 Test methods . 23
7 Markings . 41
8 Instructions for use, maintenance and assembly . 42
Annex A (normative) Characteristics of test vessels (see 6.5.2.3) . 57
Annex B (normative) Tests on needle valves (see 6.9) . 59
Annex C (informative) Examples of authorized solutions . 61
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Regulation (EU) 2016/426/EC . 68
Bibliography . 71

prEN 521:2022 (E)
European foreword
This document (prEN 521:2022) has been prepared by Technical Committee CEN/TC 181 “Appliances
and leisure vehicle installations using liquefied petroleum gas and appliances using natural gas for
outdoor use”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 521:2019+AC:2019.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Regulation (EU) 2016/426
of the European Parliament and of the Council of 9 March 2016 on appliances burning gaseous fuels and
repealing Directive 2009/142/EC.
For relationship with EU Regulation (EU) 2016/426, see informative Annex ZA, which is an integral part
of this document.
The changes from the 2019 version is the addition of a ZA Annex in relation with EU Regulation (EU)
2016/426 and adaptation of corresponding clauses.
prEN 521:2022 (E)
1 Scope
This document specifies the construction and performance characteristics related to safety and the
rational use of energy of portable appliances burning liquefied petroleum gases at the vapour pressure
within the gas cartridge or gas cylinder, excepting those where the gas cartridge is inserted horizontally
in the chassis.
NOTE These appliances are referred to in the body of the text as “appliances”.
This document applies to various types of portable appliances burning liquefied petroleum gases at
vapour pressure and designed to be used with cartridges (which comply with EN 417) or gas cylinders.
This document covers appliances for outdoor or in well ventilated areas uses only.
For example the following types of appliances are covered:
a) cooking appliances (stoves, grills, barbecues.);
This document does not cover barbecues that can be used indoors;
b) lighting appliances;
c) heating appliances;
This document only applies to appliances with a maximum heat input of up to 3 kW (H ) for outdoor use
s
only;
d) blowtorches;
This document only applies to blowtorches without a flexible hose;
e) laboratory burners.
The requirements apply to these appliances or their functional sections whether or not the latter are
independent or incorporated into an assembly.
Appliances covered by this document are not connected to a flue for the discharge of products of
combustion and are not connected to the mains electricity supply.
This document covers neither appliances supplied with LPG in the liquid phase nor appliance with fixed
integral container which may or may not be refilled by the user
It does not apply to lighters as defined in EN ISO 9994.
It does not apply to gas appliances operating with a valve cartridge which is horizontally integrated into
the chassis of the appliance also called “flat portable gas stove”.
Requirements for rational use of energy have been included for stove burners.
However, such requirements have not been included for the other types of appliances because:
— for grills and barbecues, this is a type of cooking which is achieved by various means such as radiant
elements; in addition this type of cooking varies according to the type of food and region where the
appliance is used;
— for lighting appliances, the consumption is insignificant because these appliances have a very low
rate and are used only for a few hours in a year;
— for heating appliances, all the heat produced is discharged into the environment;
prEN 521:2022 (E)
— for tools such as blowtorches which are not professional tools in regular use, the gas consumption
depends very much on the way it is used.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
1 )
EN 30-1-1:—, , Domestic cooking appliances burning gas fuel — Part 1-1: Safety — General
EN 125:2010+A1:2015, Flame supervision devices for gas burning appliances — Thermoelectric
flame supervision devices
EN 437:2018, Test gases — Test pressures — Appliance categories
EN 549:2019, Rubber materials for seals and diaphragms for gas appliances and gas
equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
stove
cooking appliance incorporating one or several burners and a pan support(s) designed in such a way that
it(they) can support the vessels containing the food
3.2
flat portable gas stove
flat stove operating with a gas cartridge horizontally placed in the chassis for which the length or width
is bigger than its height
Note 1 to entry: Figure 2 gives an example of a flat portable gas stove
3.3
vapour pressure appliance
appliance for which the pressure at the gas inlet is equal to the pressure in the gas cartridge or gas
cylinder
Note 1 to entry: If the appliance is fixed directly to the gas cylinder by a rigid connection, the appliance inlet is the
part of the connection that takes the gas from the cylinder. A pressure reducing device may be incorporated in the
gas circuit, between the gas inlet and the injector.

1)
Under preparation. Stage at the time of publication: prEN 30-1-1:2017
prEN 521:2022 (E)
Note 2 to entry: If the appliance is connected to the gas cylinder by a flexible hose, the pressure in the flexible hose
once it is connected to the gas cylinder is equal to the pressure in the gas cylinder. A pressure reducing device may
be incorporated in the gas circuit downstream of the flexible hose
3.4
gas cylinder
refillable or non-refillable container fitted with a valve filled with gas or a gas mixture
3.5
gas cartridge
non-refillable container with a maximum capacity of 1 000 ml filled with gas or a gas mixture
Note 1 to entry: It may be fitted with a valve. If it is not fitted with a valve, the release of gas is carried out following
perforation of the cartridge by means of a device incorporated in the appliance
3.6
cooking device
device supplied with the appliance designed to hold or receive the food to be cooked
Note 1 to entry: Grid, turnspit, baking tray etc.
3.7
useful part of a cooking device
part of the device in contact with food during cooking
3.8
grid
cooking device designed to hold the food to be cooked
Note 1 to entry: Its useful component(s) can be rigid or flexible
3.9
grid with flexible useful components
cooking device made up of two jointed components enabling tight gripping of the food to be cooked
Note 1 to entry: Each component consists of a rigid frame on which metallic wires are fixed and form a flexible
mesh inside the frame distorting around the food
3.10
barbecue
appliance designed principally to roast and/or grill food
Note 1 to entry: Cooking is carried out by radiant heat and, possibly, by convection and conduction
3.11
griddle
part of a stove consisting of a plate placed above a burner, that allows the cooking of food by direct contact
with the surface of the plate which is brought to a high temperature
3.12
stabilizer
part of the appliance designed to increase mechanical stability
prEN 521:2022 (E)
3.13
pan support
support placed above an open stove burner and designed to support the pan to be heated
3.14
turnspit
cooking device enabling the rotation of the food to be roasted
Note 1 to entry: The rotation can be manual or using a mechanical or electrical motor (battery)
3.15
glass panel
glass surface or part of a glass surface allowing the inside of an enclosure to be seen
3.16
fittings
safety devices, controlling devices or regulating devices and sub-assemblies thereof, designed to be
incorporated into an appliance or to be assembled to constitute an appliance
Note 1 to entry: for example valves, flame supervision devices
Note 2 to entry: cartridge is not considered as fittings
3.17
flame supervision device
device which, due to the presence of a flame on the sensing element, keeps open the gas flow to the burner
and any pilot and which cuts off the gas supply to the burner and possibly a pilot in the event of extinction
of the supervised flame
3.18
ignition delay time
time between the ignition of the supervised flame and the moment when the effect of this flame is
sufficient to keep the closing device open
3.19
extinction delay time
time between the extinction of the supervised flame and the closure of the gas supply to the burner and
possibly a pilot
3.20
tap
controlling device, part of the appliance, designed to isolate a burner from the internal gas pipework and
possibly to adjust its rate during use
3.21
control handle
component designed to be operated manually so as to operate a control of the appliance
Note 1 to entry: e.g. a tap, thermostat etc.
3.22
gripping area
outside part of the appliance designed to be handled during use
prEN 521:2022 (E)
3.23
burner
component that allows the gas to burn
Note 1 to entry: two types of burners are distinguished
— ignition burner: small burner whose flame is designed to light a main burner. It is referred to as “pilot” in this
document;
— main burner: burner designed to fulfil a thermal function of the appliance. It is referred to as “burner” in this
document
3.24
injector
component part that admits the gas into a burner
Note 1 to entry: An injector is said to be calibrated when the section of the outlet orifice is fixed
3.25
ignition device
device to ignite one or more burners directly or indirectly
3.26
primary air adjuster
device allowing the modification of the primary air rate
Note 1 to entry: The action consisting in operating this device is termed “primary air adjustment”
3.27
means of sealing
static or dynamic device designed to ensure leak tightness
Note 1 to entry: for example: flat-faced joints, O-ring or conical joints, diaphragms, grease, pastes, putties etc.
3.28
detachable
possible to dismantle without using a tool
3.29
removable
removal only possible with a tool
3.30
soft solder
solder for which the lowest temperature of the melting range, after application, is less than 450 °C
3.31
flame stability
flames are stable at the burner ports when the phenomena of flame lift or light back do not occur
3.32
flame lift
phenomenon characterized by the partial or total movement of the base of the flame away from the
burner port
prEN 521:2022 (E)
3.33
light back
phenomenon characterized by the return of the flame inside the body of the burner
3.34
calorific value
quantity of heat produced by the complete combustion, at a constant pressure equal to 1 013,25 mbar, of
a unit volume or mass of gas, the constituents of the combustible mixture being taken at reference
conditions and the products of combustion being brought back to the same conditions
Note 1 to entry: A distinction is made between:
— the gross calorific value Hs: the water produced by combustion is assumed to be condensed;
— the net calorific value Hi: the water produced by combustion is assumed to be in the vapour state
Note 2 to entry: The calorific value is expressed:
— either in megajoules per cubic metre (MJ/m3) of dry gas under the reference conditions;
— or in megajoules per kilogram (MJ/kg) of dry gas.
[SOURCE: EN 437:2018]
3.35
gas supply pressure
difference between the static pressure measured at the gas inlet connection of the appliance and the
atmospheric pressure. It is expressed in bar
4 Classification
4.1 Classification of gases
Gases likely to be used are classified in three groups according to their pressures:
a) butane:
Mixture of hydrocarbons containing mainly butanes and butenes having a maximum pressure of
8 bar gauge at 50 °C;
b) butane-propane mixture:
Mixture of hydrocarbons containing mainly butanes, butenes, propane and propene having a
pressure between 8 bar gauge and 12 bar gauge at 50 °C;
c) propane:
Mixture of hydrocarbons containing mainly propane and propene having a pressure above 12 bar
gauge at 50 °C.
prEN 521:2022 (E)
4.2 Categories of appliances
Appliances are classified in three categories according to the gases likely to be used:
— category direct pressure – butane;
— category direct pressure - butane-propane mixture;
— category direct pressure - propane.
5 Safety requirements
5.1 General
The test methods and the means of verification are indicated in Clause 6.
The design shall make it impossible to incorrectly fit or refit any user-removable or replaceable part(s)
or component(s) that can have an adverse effect on combustion or cause CO emissions to exceed limits
in Clause 5.26.
5.2 Adjustment of the burner
For appliances of types a), b) and c) of the scope of this document, not any adjustment of the burner shall
be possible.
5.3 Materials
Non-metallic materials used as radiant elements in appliances (for example volcanic rocks, refractory
blocks) shall resist to all tests of this documents without alteration.
The quality and thickness of materials used in the construction of appliances shall be such that the
constructional and performance characteristics are not altered in use. In particular all the parts of the
appliance shall withstand mechanical, chemical and thermal actions to which they may be submitted
during use. In normal conditions of operation, of cleaning or of adjustment, they shall not be liable to any
alterations which might impair their safety.
Sheet-metal parts, not made of corrosion-resistant material, shall be effectively protected against
corrosion. This requirement does not apply to grilles supporting lava rocks nor to cooking devices.
Seals and joining compounds shall have characteristics suited to their use.
Rubber based materials shall comply with EN 549:2019 class A2 minimum, and LPG resistant.
Hoses being part of the appliance shall be LPG resistant.
Copper tubing shall be used upstream of the injector only if its temperature does not exceed 100 °C when
the test described in 6.21 is carried out.
Asbestos or asbestos-based materials shall not be used.
With the exception of seals, membranes, parts in contact with gas shall be made of metallic materials.
Material intended to be in contact with food shall be:
— corrosion resistant;
— non toxic.
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The materials shall:
— not transfer undesirable odours, colours or taint to the food;
— not contribute either to the contamination of food or have any adverse influence on the food.
NOTE For information see EN 1672-2.
5.4 Assembly, cleaning and maintenance
5.4.1 Assembly
The entire appliance gas circuit, including the injector and flexible hoses if any, shall be factory assembled.
If clamps are used, they shall be of the machine formed type. Removable clamps are not permitted.
Parts, whose assembly is carried out by the user, shall be able to be assembled correctly by following the
instructions given in the instructions.
It shall not be possible to dismantle parts which are adjusted at the factory, which are not intended to be
dismantled by the user and whose dismantling would affect safety, without using tools. If dismantling is
possible using an open ended spanner or a screwdriver, direct access to such nuts and screw heads shall
not be possible, unless they are sealed.
If a pressure reducing device is integrated in the gas circuit, it shall not be removable nor replaceable by
the user.
NOTE This device can provide the functions of adjustment, opening and closing of the gas flow.
Connections shall allow the flexible hose to move freely without risk of coming into contact with a part of
the appliance whose temperature rise exceeds 70 K during the test defined in 6.21 when fitted in
accordance with the instructions.
5.4.2 Cleaning, maintenance
All parts of the appliance requiring frequent cleaning by the user shall be easily accessible. It shall be
possible to put these parts back correctly.
There shall be no sharp corners and edges on the accessible parts of an appliance which could give rise
to injury, for example during cleaning.
5.5 Strength and stability
5.5.1 Strength
5.5.1.1 General
The construction of an appliance shall be such that, during normal conditions of use:
— any displacement of parts;
— any distortion;
— any deterioration
likely to impair safe operation will not occur.
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5.5.1.2 Stove pan supports
The application of a mass as described in 6.5.1.2 on the pan support shall not cause any breakage or
permanent distortion of the pan support exceeding 1 mm.
5.5.1.3 Glass components
The accessible edges of glass components shall not be sharp. They shall withstand the various stresses to
which they are subjected during the tests described in this document without damage. In particular they
shall withstand the tests described in 6.5.1.3.1 (when they are a part of the appliance) and in 6.5.1.3.2.
5.5.2 Stability
If the appliance is fitted with a foldable support, it shall be possible to lock this in the position of use (for
example: stop, locking device).
If the radiant device of a barbecue or a grill can have several positions, a stop shall be provided for each
of them.
The stability of an appliance designed to rest on a table or on the ground shall allow safe use on level
ground. In addition, the appliance shall not tilt or fall over when it is placed on a slope of 10° and any lid
shall not close.
This requirement shall also be met when the appliance is fitted with optional parts (for example: lamp
extension posts).
These requirements shall be met under the test conditions described in 6.5.2.
5.6 Soundness of the gas circuit assembly
Holes for screws, pins, etc, intended for the assembly of components shall not open into the space
reserved for the gas ways leading to the injector.
The soundness of parts and assemblies connected to the gas circuit shall be ensured by means of metal-
to-metal joints or joints with seals (for example, flat-faced joints, O-rings or gaskets), i.e. excluding the
use of any product which ensures soundness in the threads. For parts that do not require to be dismantled
during normal maintenance, for example taps, the use of thread sealing compounds is permitted.
Removable components or the threaded parts of the gas pipework which may be dismantled during
maintenance described in the instructions shall remain sound after five disconnections and re-
connections in accordance with the instructions, if necessary after changing a gasket.
Soft solder (see definition in 3.30) shall not be used to ensure the soundness of the gas circuit. However
it is permitted for internal connections within the gas circuit when they do not involve soundness.
Under the test conditions defined in 6.6.1, during each of the tests no. One and 2, the leak shall not exceed
0,07 l/h (1 013 mbar, 15 °C). This requirement shall also be met after all the tests on the appliance have
been carried out, but before any dismantling of parts subjected to the soundness tests.
After the application of a load to the flexible hose under the conditions defined in 6.6.2, no leak greater
than 0,07 l/h (1 013 mbar, 15 °C) shall be recorded.
5.7 Connections
5.7.1 General
Whatever the type of gas cartridge or gas cylinder, when following the instructions, connection of the
appliance to the gas cartridge or gas cylinder shall be easy without gas leakage during more than 2 s.
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5.7.2 Appliances intended to be directly fitted to the gas cartridge or gas cylinder
5.7.2.1 Appliances fitted to pierceable cartridges
a) design/construction of the appliance shall be such that there is no foreseeable replacement
procedure sequence possible which can lead to an unsafe and/or unintended piercing of the cartridge
by the user.
NOTE See in informative Annex C examples of solutions given in Figures C.1 to C.7
b) The cartridge holder and the piercing device shall be such that:
1) the piercing is centred in the position provided;
2) soundness is ensured before piercing;
3) after placing the cartridge, it shall not be possible to remove it, instantaneously and
unintentionally, without first having to remove the piercing device.
Diagrams showing the correct sequence for the fitting of the cartridge to the appliance shall be marked
on the appliance.
c) Concerning the compatibility between ILL (internal leakage limiter as defined in 3.15 of
EN 417:2012) and piercing device:
— Piercing device should open and not damage ILL inside the cartridges.
— Piercing device should be such as the needle length penetrates cartridge for a distance between
7 and 9 mm (see Figure 3).
5.7.2.2 Appliances fixed onto cartridges with female valve and threaded centre boss as defined
in EN 417 (see Figure 4)
5.7.2.2.1 The female thread of the adaptor (Figure 5) designed to be fixed onto the thread of the centre
boss valve is defined as follows:
— 7/16 in - 28 threads Unified Form Special - (see Figure 6);
— major diameter : 10,96 mm minimum;
— effective diameter : 10,66 mm to 10,75 mm;
— minor diameter : 10,20 mm to 10,27 mm.
5.7.2.2.2 The part of the adaptor, with a full thread, shall be 3,10 mm ± 0,1 mm long (see Figure 5 a)).
5.7.2.2.3 The thread shall penetrate fully into the seal groove without reduction in form.
5.7.2.2.4 A valve actuator shall be fixed on the axis of the adaptor in such a way that it allows the
drawing off of gas from a full cartridge in accordance with 5.7.1. The valve actuator shall allow the release
of gas from the cartridge when the appliance is screwed onto the valve with a minimum torque of 3 Nm.
5.7.2.2.5 The diameter of the valve actuator shall not exceed 2,20 mm if it is solid and shall be between
3,10 mm and 3,15 mm if it includes a gas way as indicated in Figure 4 b). The valve actuator shall be
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concentric with the “7/16 in - 28 unified form thread” subject to a tolerance of 0,15 mm (see Figures 5 a)
and 5 b)).
5.7.2.2.6 At the point where the valve actuator comes into contact with the valve seat, the valve
actuator diameter shall be at least 1,70 mm (see Figure 5 a)).
It is recommended that adaptor manufacturers contact manufacturers of cartridge valves to establish the
preferred design (see Figure 5 b)). The valve actuator shown in Figure 5 b) comes in contact with the
inner seal of the valve ensuring complete soundness when the cartridge is fitted.
5.7.2.2.7 A seal groove shall be machined at the bottom of the threaded part so as to centre and secure
a seal (see Figure 5 a)). This seal shall come into contact with the valve centre boss. The seal and the seal
groove shall be such that there is no visible and permanent distortion of the threaded centre boss when
the appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.8 The length of the valve actuator shall be such that it does not penetrate into the valve for a
distance exceeding 4,15 mm below the plane of the upper side of the centre boss (see Figure 7,
dimension X) when the appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.9 The inlet of the adaptor prior to the thread shall be a maximum of 2,00 mm deep and have a
diameter of between 11,0 mm and 12,0 mm. In addition, the inlet of the adaptor shall begin with a
1,0 mm × 45° chamfer (see Figure 5 a)).
5.7.2.2.10 The diameter of the adaptor which penetrates the valve seal groove shall not exceed
22,90 mm. This part shall not extend more than 3,5 mm from the start of the adaptor thread (see Figure 5
a)).
5.7.2.2.11 The diameter of the adaptor beyond the 3,5 mm distance as defined in 5.7.2.2.10 shall be at
least 30,0 mm. It shall be designed so as to rest on the rolled edge of the outer rim when fixing the
appliance onto its cartridge, and after the seal ensuring soundness has come in contact with the cartridge
valve. If the appliance incorporates other parts at this point (for example: blowtorch handles, plastic
mouldings), the requirements of 5.7.2.2.10 and 5.7.2.2.11 shall be met, when these parts are in position.
5.7.2.2.12 The requirements of 5.7.2.2 shall be verified under the test conditions given in 6.7.2.2.
5.8 Transport, fixing and mobility devices
An appliance fitted with a device which, in accordance with the instructions, allows its transport and/or
fixing (for example: handles) shall be capable of being carried and/or hung without causing permanent
distortion of parts of the appliance. This requirement shall be verified under the test conditions defined
in 6.8.
Wheels allowing the movement of the appliance shall be sufficiently strong to support the appliance and,
if necessary, its full gas cartridge or gas cylinder, if this is specified in the instructions.
If the appliance has wheels, means shall be provided to prevent accidental movement during use.
5.9 Taps
5.9.1 General
Each burner shall be controlled by a tap or device allowing the opening and closing of its supply. For
appliances incorporating only one burner, this closing device may be that of the gas cartridge or gas
cylinder.
Taps shall incorporate two stops, one on the closed position and one at the end of travel.
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Taps shall be so placed in such a way that their strength, their operation, their manipulation and their
accessibility undergo no change from actions to which they are subjected in normal use.
Taps shall be mounted in such a way that no accidental movement relative to fixed gas supply pipework
is possible.
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5.9.2 Needle valves
It shall not be possible to unscrew the needle from the housing of needle valves when opening the valve.
When closing, the pressure of the needle on its seat constitutes the stop.
Needle valves shall comply with the requirements given in Annex B.
5.10 Control handles
5.10.1 Construction
It shall be obvious which burner is controlled by each control handle.
They shall be so arranged relative to one another that the movement of one handle does not cause
inadvertent movement of an adjacent one.
Control handles shall be so designed that they neither be fitted in the wrong position nor move by
themselves.
If control handles operate by turning, the closing direction shall be clockwise.
5.10.2 Marking
5.10.2.1 Taps with marked positions (for example: plug type taps)
The closed, open and, if applicable, reduced rate positions shall be marked in a visible, legible and durable
fashion.
The closed position shall be marked by a full disc or a circle at least 3 mm in diameter. It shall be the same
for all the taps.
The identification of the closed position of each tap shall not give rise to any possibility of confusion with
the identification of an open position.
For other positions, the following symbols may be used:
- Full rate position Large flame
- Reduced rate position Small flame
- Rate range Triangle
or
Scale 1 2 3 4
4 3 2 1
Other symbols, other than letters, are permitted provided that they give similar information clearly.
Additional markings are permitted provided that they do not create confusion for the appliance user.
The meaning of the symbols used shall be given in the instructions.
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5.10.2.2 Taps with variable positions (for example: needle valves)
Markings placed either on the appliance or on the control handles shall be visible, legible and durable and
comply with the following requirements:
a) the closing direction shall be marked by an arrow (possibly stylized) whose tip points to a full disc or
circle at least 3 mm in diameter or the mark “-” symbolizing the closing position, for example:

Figure 1 — Examples of closing positions
b) marking of the reduced rate is not required.
Additional markings are permitted provided that they do not create confusion for the appliances
user;
c) the meaning of the symbols used shall be given in the instructions.
5.11 Injectors
The gas rate shall be controlled by an injector of which the outlet orifice is fixed.
Removable injectors shall carry an indelible marking allowing their identification, which shall be given in
the instructions.
5.12 Ignition devices
When an ignition device is fitted, it shall be designed and constructed in such a way that it provides rapid
and safe ignition.
The components of the ignition device shall be designed to avoid damage and displacement during use.
The relative positions of the ignition device and the burner shall be sufficiently well defined to ensure
safe operation of the assembly.
5.13 Flame supervision devices
Any flame supervision device when exist shall comply with EN 125:2010+A1:2015.
When flame supervision devices are fitted, they shall be designed in such a way that, in the case of the
failure of any of the components indispensable to their performance, the supply of the gas to the burner
and to the pilot controlled by the device is cut off automatically and can only be restored by manual
operation. They shall be so mounted as to ensure satisfactory performance.
The appliance shall not incorporate any device that allows the flame supervision device to be overridden.
During the ignition period, a brief passage of unlit gas is permitted under the conditions given in 6.13.
Heating appliances, other than those supplied by cartridges (having a maximum capacity of 1 l), shall be
fitted with a flame supervision device.
Under the test conditions described in 6.13, the ignition delay time shall not exceed 20 s and the
extinction delay time shall be less than 60 s.
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5.14 Burners and radiant elements
Burners and radiant elements shall be designed in such a way that they cannot move inadvertently during
use or movement of the appliance.
The parts of a burner or a radiant element which require cleaning shall be removable and their cleaning
shall be easy unless this is possible without dismantling.
It shall not be possible to reassemble removable burner parts incorrectly and they shall not be
interchangeable if, by design, they are not identical. This shall be carried out in accordance with the
information given in the instructions.
It shall be possible to the user to check that the burners are alight.
Crosslighting devices shall have a fixed position relative to the burners that they control and shall not
distort in normal use.
Under the test conditions defined in 6.6.3, there shall be no leak of gas in a flammable quantity at the
joints of the assembly:
— of burners made up of several parts;
— of burners on the body of the appliance.
5.15 Grids
5.15.1 General
Grids shall be detachable. When their height can be adjusted in accordance with the instructions while
the burner is alight, they shall be provided with a fixed, moveable or detachable handle.
5.15.2 Grid with a rigid useful area
In the useful area of the grid, the bars, if any, shall not be more than 2 cm apart.
The grid shall be capable of withstanding, without deterioration likely to impair its use, the load described
in 6.15. Under this load, it shall remain stable on its supports.
5.16 Turnspit
Any turnspit shall be fitted with a fixed or detachable handle. This requirement is considered to be
satisfied if a motor forming a handle is used. The useful length of the handle shall be at least 80 mm.
When the distance between the support points of the turnspit is greater than 800 mm, there shall be a
second handle, unless the motor can be used as a second handle.
In order to hold the food to be grilled, the turnspit shall be fitted with one or several adjustable, lockable
devices.
When the turnspit is loaded as described in 6.16, it shall be stable on its supports.
5.17 Fireguards for heating appliances
Heating appliances shall be fitted with a guard meeting the strength and dimensional requirements
indicated in a) and b):
a) strength of fireguards:
1) probe test.
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It shall not be possible to touch any burner radiant, catalytic panel or a flame with any part of
the test probe cone illustrated in Figure 11, even after the application of the test weight
described in 6.17.1.1;
2) pull test.
The guard shall not be removed, displaced or permanently distorted when tested as described
in 6.17.1.2;
3) glass fronted appliances.
When the design of the guard includes glass or similar material this material shall not be
damaged by the impact test described in 6.17.1.3;
b) dimensions.
No opening in the guard or between the guard and the aperture to be protected, shall have dimensions
exceeding:
— length: 150 mm;
— width: 35 mm;
— diagonal: 154 mm.
Where a part of the fireguard comes within 3 mm of the aperture to be protected it shall be considered
that the part reaches the edge of the aperture to be protected.
These dimensions are subject to the following exceptions:
i) where it is not possible to pass a 12 mm diameter probe having a hemispherical end through any
opening between the guard and the aperture to be protected. The probe shall be applied with a force
of 5 N to the guard, the weight of the probe being taken into account;
ii) where the gap between any vertical rods does not exceed 5 mm.
5.18 Locations and compartments for gas cartridge or gas cylinder
5.18.1 Compartments for gas cylinder
When the appliance has an area designed to support a gas cylinder, it shall incorporate a device allowing
the safe fixing of the cylinder onto the appliance.
This compartment shall be designed in such a way that:
a) effective ventilation is provided by openings in its base and upper section. The total area of the
openings in the upper section shall be at least equal to 1 % of the base area of the compartment and
the total area of the openings at the base at least equal to 2 % of the base area of the compartment,
each opening being at least 3 mm . The openings shall not be blocked (for example by labels).
b) the support for the gas cylinder has sufficient mechanical strength to resist permanent distortion
under the load of a full gas cylinder;
c) when it is in place it shall be vertical;
d) the gas cylinder valve, if any, is readily accessible and remains easy to manipulate when the gas
cylinder is in place;
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e) when the appliance may be connected by a flexible hose, of the length indicated in the instructions,
the hose shall not come into contact with sharp edges.
5.18.2 Compartment for gas cartridge
This compartment shall be designed in such a way that effective ventilation is provided by openings in its
base. The total area of the openings at the base at least equal to 3 % of the base area of the compartment,
each opening being at least 3 mm .
The openings shall not be blocked (for example by labels).
5.19 Heat input
Under the test conditions defined in 6.19, each of the burners, supplied separately, shall be capable of
giving the nominal heat input stated in the instructions with a tolerance as illustrated in Figure 8.
5.20 Resistance to overheating
No deterioration which could impair the safety of the appliance shall be evident after the test described
in 6.20.
5.21 Temperature of various parts of the appliance
5.21.1 Floor standing or table standing appliances
Under the test conditions defined in 6.21.2.1, the surface temperatures of the various parts of the
appliance specified below shall not exceed the following limits:
a) the surface temperature of the parts likely to be touched during normal use (for example: tap
handles), measured only in the gripping area, shall not exceed the ambient temperature by more
than:
— 35 K for metals or equivalent materials;
— 45 K for porcelain or equivalent materials;
— 60 K for plastics, wood or equivalent materials.
For turnspit handles and the handles fixed on the sides of barbecue covers, this requirement applies
to a 50 mm length measured from the end of the handles.
For barbecue front cover handles, this requirement applies for areas more than 50 mm from fixing
points. If the temperature exceeds the permitted limit, the following warning shall appear on the
handle: “Hot handle - Use gloves to touch”;
b) the surface temperature of any gas cartridge or gas cylinder valve handle shall not exceed the ambient
temperature by more than 35 K;
c) the surface temperature of connections (for example: nozzles) in contact with the flexible hose shall
not exceed the ambient temperature by more than 30 K.
The temperature of appliance parts likely to come in contact with the flexible hose, when fitted in
accordance with the instructions, shall not exceed the ambient temperature by more than 70 K;
d) the surface temperature of fittings shall not exceed the maximum temperature stated in the technical
specification of the fitting.
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e) temperatures measured on accessible surfaces of the front and side panels of the appliance that can
be accidentally touched shall not exceed the ambient temperature by more than:
— metal and painted metal: 60 K;
— enamelled metal: 65 K;
— glass and porcelain: 80 K;
— plastics and wood: 100 K.
This last requirement (e)) does not apply to barbecues or heating appliances.
5.21.2 Appliances designed to be held during use
Under the test conditions defined in 6.21.2.2, the surface temperatures of the various parts of the
appliance shall not exceed the followi
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