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General requirements for explosion protected apparatus 207

apparatus. Where possible, this should be marked on the apparatus but if
it is not possible, then it must be referred to in the certification/approval
documentation. The individual protection concept standard identifies how
this information should be provided and how any user needs to be made
aware of it. In some cases, specific unusual installation requirements must
be met. These must be marked on the apparatus or, if this is not possible,
the apparatus must be marked with an 'X' and these conditions referred to
in the certification/approval documentation.

References

1 BS/EN 50014 (1993) Electrical Equipment for Potentially Explosive
Atmospheres General Requirements.
2 BS/EN 60529 (1991) Specification for Degrees of Protection Provided by
Enclosures (IP Code).
3 IS0 The International Standards Organization (the non-
electrical equivalent of CENELEC).
4 IEC 216-1 Guide for the determination of thermal endurance
properties of electrical insulating materials. Part 1
(1987) General Guide-lines for Ageing and Evalua-
tion of Test Results.
5 BS 5691 (1971) Guide for the Determination of Thermal Endurance
Properties of Electrical Insulating Materials (IEC
216-2 (1974)).
6 BS 2782 (1975) Methods of Testing Plastics. (IS0 178 (1975)) Part 3.
Mechanical Properties.
7 IEC R527 (1966) Plastics - Determination of Tensile Properties.
8 BS 3643 (1981) Metric Screw Threads. IS0 262 (1973) Part 1. Prin-
ciples and Basic Data.
9 BS 3643 (1981) Metric Screw Threads. (IS0 965-1 (1980)) Part 1.
Principles and Basic Data. General Purpose Metric
Screw Threads - tolerances. IS0 965-2 (1980)
Part 2. Limits of Sizes for General Purpose Bolt and
Nut Threads, Medium Quality.
10 IS0 4014 (1988) Hexagon Head Bolts - Product Grades A and B.
11 IS0 4017 (1988) Hexagon Head Screws - Product Grades A and B.
12 IS0 4032 (1986) Hexagon Nuts, Style 1 - Product Grades A and B.
13 BS 4168 (1981) Hexagon Socket Screws and Wrench Keys - Metric
Sizes. (IS0 4762 (1989)) Part 1. Specification for
Hexagon Socket Head Cap Screws
14 BS 4168 (1981) Hexagon Socket Screws and Wrench Keys - Metric
Sizes (IS0 4026 (1977)). Part 2. Specification for
Hexagon Socket Set Screws with Flat Point.