IEC 61241-0:2004

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Construction
    4.1 General
    4.2 Principles for design and testing of apparatus
          for use in Zone 20
    4.3 Opening enclosures
    4.4 Environmental conditions
5 Temperatures
    5.1 Maximum surface temperature
    5.2 Maximum surface temperature with respect to dust
          layers above 50 mm
    5.3 Ambient temperature
6 Enclosure materials
    6.1 Non-metallic enclosures and non-metallic parts
          of enclosures
    6.2 Enclosures containing light metals
7 Fasteners
    7.1 Access to live parts
    7.2 Compatible material
8 Interlocking devices
9 Bushings
    9.1 Prevention of turning
    9.2 Torque tests
10 Materials used for cementing
    10.1 Documentation
    10.2 Thermal stability
    10.3 Verification
11 Ex components
    11.1 General
    11.2 Mounting
    11.3 Internal mounting
    11.4 External mounting
12 Connection facilities and terminal compartments
    12.1 Attached cables
    12.2 Terminal access
    12.3 Creepage and clearance
13 Connection facilities for earthing or bonding conductors
    13.1 Internal connection
    13.2 External connection
    13.3 Facility not required
    13.4 Effective connection
    13.5 Effective contact
    13.6 Environmental
    13.7 Use of light metal
14 Cable and conduit entries
    14.1 Intended use
    14.2 Construction
    14.3 Integral part of the apparatus
    14.4 Prevention of twisting
    14.5 Method of attaching
    14.6 Blanking elements
    14.7 Branching point temperatures
15 Radiating equipment
    15.1 Lasers and other continuous wave source
    15.2 Ultrasonic sources
16 Supplementary requirements for specific electrical
    apparatus - Rotating electrical machines
    16.1 Ventilation openings for external fans
    16.2 Construction and mounting of the ventilating systems
    16.3 Clearances for the ventilating system for use
          in Zone 20 or 21
    16.4 Materials for external fans and fanhoods
17 Switchgear
    17.1 Flammable dielectric
    17.2 Interlocking
    17.3 Indication of open position
    17.4 Openings
18 Fuses
19 Plugs and sockets
    19.1 Plugs and sockets construction
    19.2 Bolted plugs and sockets
    19.3 For Zone 21 and Zone 22
    19.4 Plugs remaining energized
20 Luminaries
    20.1 Light transmitting covers
    20.2 Guards
    20.3 Mounting
    20.4 Covers
    20.5 Parts remaining energized
    20.6 Types of lamps
21 Caplights, caplamps and handlamps
    21.1 Leakage
    21.2 Separate enclosures
22 Apparatus incorporating cells and batteries
    22.1 General
    22.2 Connection of cells
    22.3 Characteristics
    22.4 Compatibility
    22.5 Limits
    22.6 Mixture of cells
    22.7 Interchangeability
    22.8 Re-charging
    22.9 Different cells
    22.10 Leakage
    22.11 Method of connection
    22.12 Orientation
    22.13 Identification of replacement
23 Verification and tests
    23.1 General
    23.2 Verification of documents
    23.3 Compliance of prototype or sample with documents
    23.4 Type tests
24 Routine verifications and tests
25 Manufacturer's responsibility
26 Verifications and tests on modified or repaired
    electrical apparatus
27 Clamping tests of cable entries for non-armoured
    and braided cables
    27.1 Cable entries with clamping by the sealing ring
    27.2 Cable entries with clamping by filling compound
    27.3 Cable entries with clamping by means of a clamping
         device
    27.4 Tensile test
    27.5 Mechanical strength
28 Clamping tests of cable entries for armoured cables
    28.1 Clamping tests where the armourings are clamped by
         a device within the gland
    28.2 Clamping tests where the armourings are not clamped
         by a device within the gland
29 Marking
    29.1 General
    29.2 Marking of all electrical apparatus
    29.3 Multiple protection techniques
    29.4 Order of marking
    29.5 Reduced marking
30 Examples of marking
    30.1 Apparatus type of protection "mD" for use in Zone 20
    30.2 Apparatus type of protection "iaD" for use in Zone 20
    30.3 Apparatus type of protection "pD" for use in Zone 21
    30.4 Apparatus type of protection "tD", Practice A (see
         IEC 61241-1); temperature tested under 500 mm dust
         layer, for use in Zone 21
    30.5 Apparatus type of protection "tD", Practice B (see
         IEC 61241-1) for use in Zone 22
    30.6 Apparatus type of protection "tD", Practice A (see
         IEC 61241-1) for use in Zone 22
Bibliography
Figures
Tables

Specifies general requirements for the design, construction, testing and marking of electrical apparatus protected by any recognized safeguard technique for use in areas where combustible dust may be present in quantities that could lead to a fire or explosion hazard. The application of electrical apparatus in atmospheres which may contain explosive gas as well as combustible dust, whether simultaneously or separately, requires additional protective measures.The contents of the corrigendum of November 2005 have been included in this copy.