Page 216 - Electrical Installation in Hazardous Area

180 Electrical installations in hazardous areas

particular protection concept Standard and, in this case, that Standard will,
in its scope where exclusion is total, or in its detailed text where exclusion is
only partial, define those parts of BS/EN 50014 (1993)' which do not apply.
The basic matters dealt with in BS/EN 50014 (1993)' and its predecessor,
BS 5501, part 1 (1977) are as follows:

1. Definitions of terms used in BS/EN 50014 (1993)' and its subsidiary
protection concept Standards.

2. The method by which apparatus is divided into groups and temperature
classes for utilization purposes.
3. Requirements for enclosures.

4. Requirements for fasteners used for enclosure securing, interlocking
devices used to prevent protection being bypassed, bushings used for
connections, and cements which may be used in enclosure construction.
5. Requirements for connection of conductors to the apparatus and for entry
of cables to the apparatus.

6. Requirements which additionally apply to particular types of apparatus
such as rotating machines, luminaires, fuses, etc.
7. Requirements for ex-components, which are components which form
part of an apparatus but may be used in several types of apparatus, and
be examined for compliance with the appropriate parts of the standard
separately to avoid repeat evaluation.
8. Requirements for marking of complying apparatus to ensure that appro-
priate information is given to the purchaser.

It is worthy of note that BS/EN 50014 (1993)' draws attention to the fact
that apparatus constructors need also to ensure that basic electrical safety
requirements are met, and are assumed to guarantee this by application of
the marking required by the Standard. (BS 5501, part 1 (1977) required a
specific form of declaration for this purpose.)

8.1.1 Definitions

There are some 25 definitions in the Standard, some dealing with terms
such as apparatus and some dealing with the meaning of some of the
symbols used in the Standard and its supplementary protection concept
Standards. In common with earlier chapters they will be detailed at the
end of this book. While in the main, these definitions cover all of the group
of Standards, they are not complete but need to be added to by additional
definitions in the protection concept Standards (showing the problems asso-
ciated with limiting the meaning of terms by definition).