AS 2431-1981

1 - AS 2431-1981 ELECTRICAL EQUIPMENT FOR EXPLOSIVE ATMOSPHERES - ENCAPSULATED APPARATUS - TYPE OF PROTECTION m
4 - PREFACE
5 - CONTENTS
6 - FOREWORD
7 - SECTION 1. SCOPE AND GENERAL
7 - 1.1 SCOPE.
7 - 1.2 DEFINITIONS
7 - 1.2.1 Encapsulation
7 - 1.2.2 Encapsulated apparatus
7 - 1.2.3 Encapsulating material
7 - 1.2.4 Encased apparatus
7 - 1.2.5 Ignition temperature
7 - 1.2.6 Maximum surface temperature
7 - 1.2.7 Mould
7 - 1.2.8 Moulding
7 - 1.3 GROUPING.
7 - 1.4 TEMPERATURE CLASSIFICATION.
8 - SECTION 2. DESIGN AND CONSTRUCTION
8 - 2.1 ENCAPSULATED APPARATUS.
8 - 2.2 EARTHING.
8 - 2.3 ENCAPSULATING MATERIAL.
8 - 2.4 CASING.
8 - 2.5 THREADED JOINTS.
8 - 2.6 MEANS FOR CONNECTION OF EXTERNAL CIRCUIT CONDUCTORS.
8 - 2.7 WINDINGS.
8 - 2.8 MARKING.
9 - SECTION 3. TESTS
9 - 3.1 GENERAL.
9 - 3.2 DIMENSIONAL TESTS.
9 - 3.3 ENCAPSULATING MATERIAL TESTS.
9 - 3.3.1 General.
9 - 3.3.2 Electric Strength.
9 - 3.3.3 Withstand Value.
9 - 3.3.4 Water Absorption.
9 - 3.3.5 Igni tability and Combustion Propagation.
9 - 3.4 IMPACT TESTS.
9 - 3.5 FAULT LEVEL TEST.
9 - 3.6 COMPLIANCE WITH AS C100.
9 - 3.7 TEMPERATURE RISE TEST.
10 - APPENDIX A - INFORMATION TO BE CONTAINED IN DRAWINGS OF ENCAPSULATED ELECTRICAL APPARATUS
10 - A1 CONSTRUCTION.
10 - A2 HOLES.
10 - A3 CONDUCTORS.
10 - A4 MATERIALS.
11 - APPENDIX B - METHOD FOR THE DETERMINATION OF ELECTRIC STRENGTH
11 - B1 SCOPE.
11 - B2 FORM OF TEST SPECIMEN.
11 - B3 NUMBER OF TEST SPECIMENS.
11 - B4 ELECTRODES.
11 - B5 TEST VOLTAGE.
11 - B6 TRANSFORMER.
11 - B7 PROCEDURE.
12 - B8 REPORT.
12 - B9 NOTE ON PROOF TESTING (MINUTE VALUE).
13 - APPENDIX C - METHOD FOR THE DETERMINATION OF WATER ABSORPTION
13 - C1 SCOPE.
13 - C2 FORM OF TEST SPECIMEN.
13 - C3 NUMBER OF TEST SPECIMENS.
13 - C4 PROCEDURE.
13 - C5 CALCULATION.
13 - C6 REPORT.

Specifies requirements for electrical equipment which uses encapsulation as the means for ensuring suitability for use in a hazardous location. Covers design requirements and test procedures.

This standard specifies requirements for encapsulated electrical apparatus or parts of encapsulated electrical apparatus, and for those features of design and construction that are considered to be essential to the securing ofreliability of the apparatus in service and for use in defined hazardous areas.