1、 IEC 60079-7 Edition 5.02015-06INTERNATIONAL STANDARD Explosive atmospheres Part 7:Equipment protection by increased safety e IEC 60079-7:2015-06(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publicatio
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10、er assistance,please contact the Customer Service Centre:csciec.ch.IEC 60079-7 Edition 5.0 2015-06 INTERNATIONAL STANDARD Explosive atmospheres Part 7:Equipment protection by increased safety e INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.260.20 ISBN 978-2-8322-2710-7 Registered trademark of the
11、 International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC 60079-7:2015 IEC 2015 CONTENTS FOREWORD.8 1 Scope.14 2 Normative references.15 3 Terms and definitions.17 4 Constructional requirements.21 4.1 Level of Protection.21 4
12、.2 Electrical connections.21 4.2.1 General.21 4.2.2 Field wiring connections.22 4.2.3 Factory connections.23 4.2.4 External plug and socket connections for field wiring connection.25 4.3 Clearances.26 4.4 Creepage distances.26 4.5 Printed wiring boards with conformal coating,Level of Protection“ec”.
13、32 4.6 Solid electrical insulating materials.33 4.6.1 Specification.33 4.6.2 Long-term thermal stability.33 4.7 Windings.34 4.7.1 General.34 4.7.2 Insulated conductors.34 4.7.3 Winding impregnation.34 4.7.4 Conductor dimensions.34 4.7.5 Sensing elements.35 4.8 Temperature limitations.35 4.8.1 Genera
14、l.35 4.8.2 Conductors.35 4.8.3 Insulated windings.36 4.9 Wiring internal to equipment.36 4.10 Degrees of protection provided by enclosures.37 4.11 Fasteners.38 5 Supplementary requirements for specific electrical equipment.38 5.1 General.38 5.2 Electrical machines.38 5.2.1 General.38 5.2.2 Degrees o
15、f protection provided by electrical machines,Level of Protection“eb”.39 5.2.3 Degrees of protection provided by electrical machines,Level of Protection“ec”.39 5.2.4 Connection facilities for external conductors.39 5.2.5 Internal fans.39 5.2.6 Minimum air gap.39 5.2.7 Rotating electrical machines wit
16、h cage rotors.40 5.2.8 Limiting temperature.42 5.2.9 Machines with permanent magnet rotors.45 5.2.10 Stator winding insulation system.45 5.2.11 Supplemental winding requirements Level of Protection“eb”.46 IEC 60079-7:2015 IEC 2015 3 5.2.12 Bearing seals and shaft seals.46 5.2.13 Neutral point connections.47 5.3 Luminaires,hand lights,or caplights.47 5.3.1 General.47 5.3.2 Light source.48 5.3.3 Minimum distance between lamp and protective cover.49 5.3.4 Electrical spacings.49 5.3.5 Lampholders an