Page 34 - Electrical Installation in Hazardous Area

Introduction 13

Electrical Equipment
Certification Service

EECS I BASEEFA &

I sira
I
I

I Certification Service

Aepistration Number
01 1
scs

PhysicaVSCH
Technische
Bundesanstalt

PTB

Fig. 1.4 Typical certification logos

(described later) and the manufacturer. An example of a typical certificate
is given in Fig. 1.5. What should be noted is the limit of the certificate.
It only specifies the equipment as being in accordance with the detailed
construction requirements in the specified Standard and does not address
installation which will vary depending upon the country of installation.
Therefore care needs to be taken in careful consideration of the way in which
equipment is installed, so as to ensure that the safety elements included in
its construction are not negated by its method of installation.
The listed approved bodies meet regularly in a working group titled
Heads of Test Houses Liaison Committee (HOTL)I5 which was set up by
the Commission of the EU. The object of this group is to ensure that all
approved bodies use the Standards in the same way and present their
certificates in the same way. It is not intended to be a body for the deciding
of the meaning of unclear parts of the Standards although it, of necessity
becomes involved in such activity. The clarification and interpretation of
Standards is for the Standards' writing bodies (CENELEC in this case) but
such bodies are by their nature cumbersome and thus queries on Standards