Page 213 - Electrical Installation in Hazardous Area

Design philosophy for electrical apparatus for explosive atmospheres 177

the second editions will, when used with this standard, produce satisfactory
results.

IEC 1241 -1 - Electrical apparatus for use in the presence of combustible
dust, Part 1 : electrical apparatus protected by enclosure (see Chapter 6)
This is the IEC document which is relevant to dust hazards and is a much
newer document.
The requirements of this Standard are not dissimilar to BS 6467, Part 1
and at some time in the future it is expected that the two Standards will
be harmonized. Until that time, however, it is expected that equipment to
either the IEC Standard or BS 6467, Part 1 will be acceptable in the UK.
A further Part of IEC 1241 is also envisaged and will address at least
some of the matters addressed by BS 7535. Work is in hand on sections
to cover intrinsic safety 'i' and pressurization 'p' in dust risks. When they
are published, unless the UK votes against them, they are expected to be
acceptable in the UK as alternatives to BS 7535.

References

1 BS 4137 (1967) Guide to the Selection of Electrical Equipment for use in
~~
Division 2 Areas.
2 76/117/EEC Council Directive of 18 December 1975 (on the approxi-
mation of the laws of Member States concerning electrical
equipment for use in Potentially Explosive Atmospheres)
3 BS 6467 Electrical Apparatus with Protection by Enclosure for Use
in the Presence of Combustible Dusts. Part 2 (1985) Guide
to Selection, Installation and Maintenance.
4 RoSPA/ICI Engineering Codes and Regulations, Electrical Instal-
lations in Flammable Atmospheres (1973). Group C
(Electrical), Volume 1.5.
5 94/9/EC Directive of the European Parliament and Council of 23
March 1994 (on the approximation of the laws of Member
States concerning equipment and protective systems in-
tended for use in Potentially Explosive Atmospheres)
6 BS 4683 Electrical Apparatus for Explosive Atmospheres Part 3
(1972). Type of Protection N.
7 Official Journal of the European Communities.