Page 41 - Electrical Installation in Hazardous Area

20 Electrical installations in hazardous areas

Applies to an approved Operates a similar
(notified) body for certification -OR quality system of
of production quality 1 own responsibility
system to BS/EN/OSI 9002 .c
J- The approved (notified)
body examines and
The approved (notified) tests all equipment
body certifies the quality produced

For category 2 equipment (that intended for Zone 1)

Applies to approved
(notified) body for system of own
certification of his
quality system to
BSIENIISO 9003

body examines all
Approved (notified) body
monitors quality system
and product

Fig. 1.6(b) Route to certification - Directive 94/9/EC

This will give more confidence to the user that purchases will accurately
reflect the certification but, as the quality management requirements are
again extremely subjective, it will cause considerable interpretive problems
and is a further need for an expanded HOTL. The route to certification
under the new Directive is given in Fig. 1.6a. When the manufacturer has
obtained a type certificate for a product, using the system in Fig. 1.6a in
accordance with the appropriate EN Standard or the essential requirements
of the Directive, the steps illustrated by Fig. 1.6b are followed in respect of
category 1 and category 2 equipment. (For category 3 equipment (intended
for Zone 2) no certification by an approved (notified) body is necessary,
The manufacturer confirms compliance by declaration and application of
CE Mark.)

Ref e re n ces

1 Hicks, W. F and Brown, K. J (1971). Assessment of explosion probability
for intrinsically safe apparatus. (IEE Conference on electrical safety in
hazardous environments - 16-18 March).