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ПІДТВЕРДЖУ В А ЛЬНЕ ПОВІДОМЛЕННЯ

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Наказ від 08.07.2016 № 204

EN 12882:2015

Conveyor belts for general purpose use - Electrical and flammability safety requirements

прийнято як національний стандарт
методом «підтвердження» за позначенням

ДСТУ EN 12882:2015
(EN 12882:2015, IDT)

Стрічки конвеєрні загального призначення. Вимоги щодо електробезпеки та вогнестійкості

З наданням чинності від 2016-07-13EUROPEAN STANDARD

NORME EUROPEENNE

EUROPAISCHE NORM

ICS 53.040.20

EN 12882

August 2015

Supersedes EN 12882:2008

English Version

Conveyor belts for general purpose use - Electrical and
flammability safety requirement

s

Courroies transporteuses a usage general - Prescriptions
de securite electrique et protection contre I'inflammabilite
Fordergurte fur allgemeine Anwendung - Elektrische und
brandtechnische Sicherheitsanforderungen

This European Standard was approved by CEN on 27 June 2015.

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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN 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 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
СОМІТЁ EUROPEEN DE NORMALISATION
EUROPAISCHES KOMITEE FUR NORMUNG

C

Ref. No. EN 12882:2015 E

EN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members

.Contents Page

European foreword 3

Introduction 4

1. Scope 5

2. Normative references 5

3. Terms and definitions 5

4. Safety requirements 6

   1. General 6

   2. Electrical conductivity 6

   3. Flame retardation 6

   4. Fire simulation 7

   5. Drum friction 7

5. Safety categories 7

   1. Category 1 7

   2. Category 2A 7

   3. Category 2B 7

   4. Category ЗА 8

   5. Category ЗВ 8

   6. Category 4A 8

   7. Category 4B 8

   8. Category 5A 8

   9. Category 5B 9

   10. Category 5C 9

Annex A (informative) Suggested belt approval / certification options 12

Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EC Directive 2006/42/EC 13

Bibliography 14European foreword

This document (EN 12882:2015) has been prepared by Technical Committee CEN/TC 188 “Conveyor belts”, the secretariat of which is held by SNV.

This document supersedes EN 12882:2008.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2016, and conflicting national standards shall be withdrawn at the latest by February 2016.

The main changes with respect to the previous edition are listed below:

• electrical conductivity test requirements for light conveyor belts have been removed from all categories except 1,2A and 2B;

• the requirement for flame retardation testing has been added to category 4A, 4B, 5A, 5B and 5C;

• alternative fire simulation tests have been added to category 4A, 4B, 5A, 5B and 5C.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

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 Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.

According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Introduction

This document is a type C standard as stated in EN ISO 12100.

The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this document.

When provisions of this type C standard are different from those which are stated in type A or В standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard.

During the preparation of this European Standard, the hazards which have been identified as being directly related to the use of conveyor belts are:

1. hazards associated with the discharge of static electrical energy;

2. hazards associated with the impingement of small naked flames on the cover and/or carcass of a conveyor belt at rest;

3. hazards caused by the stalling of a conveyor belt and the continued operation of the driving mechanism causing localized heating of the conveyor belt through contact with the driving drum or cylinder or some other source of frictional heat;

4. hazards caused by the propagation of a flame along a belt which has been exposed to a relatively high energy source such as a fire.

The risk, or probable rate of occurrence of these hazards and the degree of harm they can cause will vary depending upon the particular circumstances of the application or site of application, which are many and varied. Consequently, the level of safety required will vary from one application to another, depending upon the risks judged to be pertinent. The hazards listed above should not be taken as the only properties affecting safety in operation. Other aspects such as health or environmental requirements should be considered. Depending on the individual end use requirement, these other factors can affect the category of belt selected and additional safety precautions may need to be employed.

1. This European Standard is therefore designed to enable the user to select the category of conveyor belt most suited to the particular circumstances of the application.Scope

This European Standard specifies electrical and flammability safety requirements for general purpose conveyor belts not intended for use in underground installations and a means of categorizing conveyor belts in terms of the level of safety sought in their end use application. This European Standard does not provide electrical safety requirements for volume resistance which may be measured by the methods in EN ISO 21178 and which is relevant to some types of light conveyor belts.

This European Standard is not applicable to conveyor belts which are manufactured before the date of publication of this document by CEN.

NOTE 1 Directive 94/9/EC concerning equipment and protective systems intended for use in potentially explosive atmospheres can be applicable to the type of machine or equipment covered by this European Standard. The present standard is not intended to provide means of complying with the essential health and safety requirements of Directive 94/9/EC, this being covered in EN 14973.

NOTE 2 EN 12882 is not a product standard but is intended to help users of conveyor belts to select the required electrical and flammability safety properties needed following a suitable risk assessment. No requirements are, therefore, included for marking, information to be supplied, etc., these matters being covered in relevant product standards such as EN ISO 14890 and EN ISO 15236-1.

2. Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1554:2012, Conveyor belts - Drum friction testing

EN 12881-1:2014, Conveyor belts - Fire simulation flammability testing - Part 1: Propane burner tests

EN ISO 284, Conveyor belts - Electrical conductivity - Specification and test method (ISO 284)

EN ISO 340, Conveyor belts - Laboratory scale flammability characteristics - Requirements and test method (ISO 340)

EN ISO 21178, Light conveyor belts - Determination of electrical resistances (ISO 21178)

EN ISO 21179, Light conveyor belts - Determination of the electrostatic field generated by a running light conveyor belt (ISO 21179)

EN ISO 21183-1, Light conveyor belts - Part 1: Principal characteristics and applications (ISO 21183-1)

3. Terms and definitions

For the purposes of this document, the following terms and definitions apply.

afterflame

flame which persists after the ignition source has been removed

afterglow

persistence of glowing, after cessation of flaming or, if no flaming occurs, after the ignition source has been removed

flame, noun

zone of combustion in the gaseous phase usually with emission of light

flame, verb

to undergo combustion in the gaseous phase with emission of light

glowing

made luminous by heat, (without flame)

undamaged

part remaining of a conveyor belt after the termination of the propane gallery fire test described in accordance with EN 12881-1 and which shows no evidence of embrittlement, cracking, blistering or other blemishes not originally present

4. Safety requirements

   1. General

Conveyor belts within each category (1, 2A, 2B, ЗА, ЗВ, 4A, 4B, 5A, 5B and 5С) shall meet the test requirements as indicated in Table 1 and in the specific subclauses below.

NOTE Under special service conditions, whereby higher electrostatic charges resulting in surface potentials of more than 1000 V can be generated due to friction between belt surface and conveyed goods, or due to friction within the conveyed goods like non-condactive bulk goods such as sugar, flour or plastic granules. The requirements for safety in this standard do not consider such critical service conditions, but only the run of the empty light conveyor belt and the electrostatic charges generated thereby.

In certain circumstances (e.g. in the transportation of electronic components), the dissipation of electrical charges through the belt may be required. This requirement can be specified in terms of volume resistance as measured by the method described in EN ISO 21178. However, the requirements for safety in this standard do not consider the volume resistance of light conveyor belts for the allocation to the different safety categories.

1. 3. Flame retardation

      1. Conveyor belts in category 2A, or ЗА, (see Clause 5 and Table 1), when tested in accordance with EN ISO 340 with covers intact, shall have an aggregate of the times for duration of afterflame for all six tests of less than 45 s and no individual result shall be greater than 15 s.

      2. Conveyor belts in category 2B, 3B, 4A, 4B, 5A, 5B and 5C (see Clause 5 and Table 1), when tested in accordance with EN ISO 340 with covers intact and also with covers removed, shall have an aggregate of the times for duration of afterflame for each group of six tests, (i.e. six tests with covers intact and six tests with covers removed) of less than 45 s and no individual result shall be greater than 15 s.

   4. Fire simulation

      1. Conveyor belts in categories 4A and 4B, 5A, 5B and 5C (see Clause 5 and Table 1), when tested in accordance with Method A, C or D of EN 12881-1:2014, shall retain a length of undamaged conveyor belt as indicated in Table 1.

      2. The test methods in accordance with EN 12881-1 are not applicable for light conveyor belts as described in EN ISO 21183-1. Therefore light conveyor belts can only be assigned to the categories 1, 2A and 2B.

   5. Drum friction

      1. Conveyor belts in categories ЗА, ЗВ and 4B (see Clause 5 and Table 1), when tested in accordance with Method B1 of EN 1554:2012 (constant load of 343 N), shall exhibit no flame whatsoever throughout the test, which shall continue for 60 min duration, or until the belt breaks, whichever is the shorter time.

      2. Conveyor belts in category 5A (see Clause 5 and Table 1), when tested in accordance with Method B2 of EN 1554:2012, shall exhibit no flame whatsoever throughout the test, which shall continue for 150 min duration, or until the belt breaks, whichever is the shorter time.

      3. Conveyor belts in category 5B (see Clause 5 and Table 1), when tested in accordance with Method B2 of EN 1554:2012, shall exhibit no flame or glowing whatsoever throughout the test, which shall continue for 150 min duration, or until the belt breaks, whichever is the shorter time.

      4. Conveyor belts in category 5C (see Clause 5 and Table 1), when tested in accordance with Method B2 of EN 1554:2012, shall exhibit no flame or glowing whatsoever throughout the test, which shall continue for 150 min duration, or until the belt breaks, whichever is the shorter time, and at no time during the test shall the drum temperature exceed 400 °С.

      5. The test methods in accordance with EN 1554 are not applicable for light conveyor belts as described in EN ISO 21183-1. Therefore light conveyor belts can only be assigned to the categories 1, 2A and 2B.

2. Safety categories

NOTE A summarized tabular presentation of the requirements in Clause 4 and Clause 5 is given in Table 1.

A conveyor belt shall be designated only as a category 1 conveyor belt if it complies with the requirements in 4.2.

A conveyor belt shall be designated as a category 2A conveyor belt only if it complies with the requirements of 4.2 and 4.3.1.

A conveyor belt shall be designated as a category 2B conveyor belt only if it complies with the requirements of 4.2 and 4.3.2.

A conveyor belt shall be designated as a category ЗА conveyor belt only if it complies with the requirements of 4.2,4 3.1 and 4.5.1.

If it is not possible to conduct the test specified in 4.5.1, due to the constructional properties of the type of belt selected for safety category ЗА, the conveyor belt shall be described as a category 2A conveyor belt.

In this case, additional safety precautions should be employed complying with EN ISO 12100, EN 619 or EN 620.

NOTE Light conveyor belts cannot be assigned to category ЗА.

A conveyor belt shall be designated as a category 3B conveyor belt only if it complies with the requirements of 4.2, 4.3.2 and 4.5.1.

If it is not possible to conduct the test specified in 4.5.1 (drum friction test), due to the constructional properties of the type of belt selected for safety category 3B, the conveyor belt shall be described as a category 2B conveyor belt.

In this case, additional safety precautions should be employed complying with EN ISO 12100, EN619 or EN 620.

NOTE Light conveyor belts cannot be assigned to category 3B.

A conveyor belt shall be designated as a category 4A conveyor belt only if it complies with the requirements of 4 2,4.3.2 and 4.4.

NOTE Light conveyor belts cannot be assigned to category 4A

A conveyor belt shall be designated as a category 4B conveyor belt only if it complies with the requirements of 4.2, 4.3.2, 4.4 and 4.5.1.

If it is not possible to conduct the test specified in 4.5.1, due to the constructional properties of the type of belt selected for safety category 4B, the conveyor belt shall be described as a category 4A conveyor belt.

In this case, additional safety precautions should be employed complying with EN ISO 12100, EN 619 or EN 620.

NOTE Light conveyor belts cannot be assigned to category 4B.

A conveyor belt shall be designated as a category 5A conveyor belt only if it complies with the requirements of 4.2, 4.3.2, 4.4 and 4.5.2.

If it is not possible to conduct the test specified in 4.5.2, due to the constructional properties of the type of belt selected for safety category 5A, the conveyor belt shall be described as a category 4A conveyor belt.

In this case, additional safety precautions should be employed complying with EN ISO 12100, EN 619 or EN 620.

NOTE Light conveyor belts cannot be assigned to category 5A.

A conveyor belt shall be designated as a category 5B conveyor belt only if it complies with the requirements of 4.2, 4.3.2, 4.4 and 4.5.3.

If it is not possible to conduct the test specified in 4.5.3 (drum friction test), due to the constructional properties of the type of belt selected for the safety category 5B, the conveyor belt shall be described as a category 4A conveyor belt.

In this case, additional safety precautions should be employed complying with EN ISO 12100, EN619 or EN 620.

NOTE Light conveyor belts cannot be assigned to category 5B.

A conveyor belt shall be designated as a category 5C conveyor belt only if it complies with the requirements of 4.2,4.3.2,4 4 and 4.5.4.

If it is not possible to conduct the test specified in 4.5.4 (drum friction test), due to the constructional properties of the type of belt selected for safety category 5C, the conveyor belt shall be described as a category 4A conveyor belt.

In this case, additional safety precautions should be employed complying with EN ISO 12100, EN619 or EN 620.

NOTE Light conveyor belts cannot be assigned to category 5C.

Table 1 — Safety requirements for conveyor belts for general purpose use