Page 210 - Electrical Installation in Hazardous Area

174 Electrical installations in hazardous areas

produces a further complication as it refers to the first edition of EN 50014
and should be used with that edition. This is not, however, a major problem
as those parts of EN 50014 which apply can be derived from either edition
of EN 50014 without problems (see Chapter 9).

EN 50039 (1980) - Intrinsically safe electrical systems ‘i’
(see Chapter 13)
This is the first edition of this particular Standard and is dual numbered as
BS 5501, Part 9 (1982). Fortunately it does not directly relate to EN 50014
but is stated to be a supplement to EN 50020 (1977) (BS 5501 part 7 (1977)),
the first edition of that Standard. There is no practical problem here and this
Standard can equally be used with the second edition of EN 50020 which
is current (BS/EN 50020) (see Chapter 13).

7.5.2 The marketing situation in respect of European Standards
The value of the European Standards referred to in Section 7.5.1 lies in the
fact that equipment which complies with them in their appropriate issue
may bear the Distinctive Community Mark and has free access to both the
EU and EFTA (European Free Trade Association) States. The problem lies
in the difficulty in harmonizing the political (EU) documentation with the
standards which are written by a separate technical body (CENELEC). For
the time being, equipment must comply with the first editions of these
standards to bear the Distinctive Community Mark but will also need to
comply with the second editions of the Standards because of the imminent
modification of the older Directid. It is likely, for the time being, that
equipment will need, to provide maximum flexibility for the manufacturer,
to comply with both the first and the second editions.
In addition, because two of the above Standards are still current in their first
editions, the situation appears even more complicated. These two Standards,
however, make limited reference to EN 50014 and the change of edition of
that Standard will make little practical difference. Also, the ‘n’ Standard is
relatively contemporary and will include much of current thinking.
In addition to the above Standards, a certification Standard was issued
for type of protection ‘s‘ by one of the UK third-party certification bodies.
This may sound odd as, if an item of equipment is special it infers that it
is non-standard. These was, however, a good reason for this issue and the
Standard is used by both UK third-party certification bodies for the issue
of national certificates, as opposed to the European certificates issued for
equipment complying with European Standards.

SFA 3009 (1972) - BASEEFA Standard for type of protection ‘s’
(see Chapter 9)

This Standard included many of the techniques developed, but not
included, in formal Standards at the time (e.g., sinters, encapsulation, etc).