Approval/Certificate/Document of Conformity

[13] SCHEDULE
[14] EU-TYPE EXAMINATION CERTIFICATE No.
CNEX 16 ATEX 0005U Issue 1
Report: 17018
This certificate may only be reproduced in its entirety and without any change, including schedule
CNEX-FM-604E Issue 3 Page 4 of 5
[17] Schedule of Limitations:
The modular terminal blocks models WPD 104 to WPD 109 shall always be installed inside suitable
certified enclosures. For use in flammable gases these enclosures must satisfy the requirements
conform EN 60079-0 and EN 60079-7. For use in combustible dust these enclosures must satisfy
the requirements conform EN 60079-0 and EN 60079-31.
When installed, all connections, even if unused, shall be tightened with the torques specified in the
manufacturer’s instructions.
The transparent covers are always to be applied on the terminal blocks
For each modular terminal block, there shall always be only one cable installed in the incoming
connection side of the terminal block.
When flexible busbar connections are used instead of wires (applicable only for WPD 106, WPD 108
and WPD 109), these flexible busbar connections shall comply with the requirements of EN 60079-7.
Multiple wires installed into one connection are not allowed.
When combined with other terminal block series and accessories, the applicable creepage and
clearance distances shall be observed.
The insulation material has a limiting temperature of +100 °C.
The temperature rise in the terminals does not exceed 40 K at 110 % of the rated current.
The enclosure shall be constructed to block all sun and UV light from affecting the terminal blocks.
The terminal blocks shall be placed inside a suitable certified IP54 enclosure in type of protection “e”
for gas atmosphere. For dust atmosphere the terminal blocks shall be mounted inside a suitable
certified IP6X enclosure (IEC/EN 60079-31) in type of protection “t”.
Under normal operating conditions the temperature rise of the terminal blocks is maximum 40 K,
measured at the maximum permitted rated current. Due to the above mentioned, the terminal blocks
may be used in apparatus of temperature classes T6 ...T1 as long as the terminal block ambient
temperature range is not exceeded. No part of terminal block must exceed 100 °C under any
condition.
No other wire sizes or types than the ones specified in instructions must be used. The terminal blocks
must either be mounted next to another block of the same type and size or with an end plate.
If smaller conductor cross sections than the rated conductor cross sections are used, then the
corresponding lower current shall be stated in the certificate of the complete apparatus.
The resistance across the terminals, at rated conductor cross-section, are given as follows:
Model:
WPD 104
WPD 105
WPD 106
WPD 107
WPD 108
WPD 109
contact resistance
[mOhm]
< 0,32
< 0,26
< 0,2
< 0,14
< 0,13
< 0,1