Eaton ZB12/XTOB BC1 Series Manual page 41

03/15 MN03407004Z-DE/EN
Foreword
1 ZB12/XTOB...BC1 and
ZB32/XTOB...CC1 overload relays
In addition to the degree of protection specified in the
standards EN 60079-14 and VDE 0165 Part 1, further
provisions have been made to ensure safety from ignition for
motors operated in potentially explosive atmospheres.
EN 60079-7 prescribes additional measures to be taken for
the operation motors with "increased safety" type of
protection "e". These measures provide a higher degree of
safety and prevent impermissible high temperature and
development of sparking and arcing on the motors, which
usually does not occur under normal operating conditions.
The motor-protective devices for this that are themselves not
located in the Ex e area must be certified by an accredited
certification body.
For for motors in explosive dust-air mixtures, standard
EN 60079-14 specifies additional measures.
Directive 94/9/EC (ATEX 100a) on the approximation of the
laws of the Member States concerning devices and
protective systems intended for use in potentially explosive
areas has been in force since 06.30.2003.
The ZB12/XTOB...BC1 and ZB32/XTOB...CC1 overload
relays are certified by PTB according to the 94/9/EC
(ATEX 100a) Directives.
The following standards were used for aspects related to
functional safety:
• Risk analysis of hazards, hazardous situations, and
hazardous events as per EN ISO 12100,
• SIL determined based on the risk graphs in IEC 61508.
a The EC prototype test certification numbers are as
follows:
ZB12-.../XTOB...BC1: PTB 10 ATEX 3010
ZB32-.../XTOB...CC1: PTB 10 ATEX 3010
37