TECHNICAL NOTE
N°
Page Rev.
Date
Issued
Approved
37
1
0
05/09/16
DBC.4
“increased
safety”
terminal
blocks,
are
manufactured
according
to
the
prescriptions
given
by
IEC / EN 60079-0, IEC / EN 60079-7 Standards and are in compliance with the ATEX 2014/34/UE Directive and the
IEC Ex Certification Scheme
DBC.4 terminal blocks are also designed and manufactured in compliance with IEC / EN 60947-1 and IEC / EN 60947-7-1
reference product standards.
Terminal blocks (components) must be inserted in Ex e enclosures. The terminal enclosure assembly must
be subjected to separate certification.
DBC.4 terminal blocks are suited for a temperature range between - 40 and + 80 °C
Ambient temperature range shall be between - 40 and + 40 °C
Rail assembly composition in potentially explosive (Ex e) environments
End section
Comb-type cross connection PTC “Easy bridge”
Mounting rail
End bracket
Each rail assembly is formed by two or more adjoining terminal blocks and by END BRACKETS, that are located at the ends of
the assembly, in a way to obtain a compact and single arrangement.
As the back of each terminal block performs the function of insulating wall for the adjoining terminal block, an END SECTION is
necessary to close and provide appropriate insulation to the first terminal block forming the assembly.
Rail assemblies can be subdivided into groups by interposing COLOURED PARTITIONS, in order to ease the location of
different circuits
Each terminal block can be connected to adjoining elements by means of CROSS CONNECTION of the comb type.
Adjoining terminal blocks can be visually separated by interposing a COLOURED PARTITION, having a thickness of 1,5 mm.
Adjoining jumpers between different phases should be electrically separated by interposing an END SECTION type DBC/PT.
Multiple cross connections can be performed between terminal blocks, by means of a comb-type CROSS CONNECTION the
use of which enables also to obtain parallel extending, pole skipping, staggered, and parallel skipping cross-connection
schemes
Ex e Instruction Manual N° 37
