User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
Essential Health and Safety Requirements:
Concerning ESRs this Schedule verifies compliance with the Annex III of ATEX directive only. By placing the
product on the market, the manufacturer declares compliance with other relevant Directives,
and all other safety related requirements including those of Annex II of this Directive.
Unused terminals shall be tightened.
Note:
If smaller cross sections than the rated cross section are used, the belonging lower current has to be laid down in the
IECEx/EC-Type Examination Certificate of the complete apparatus.
Mounting instructions:
The WDK/WDK PE series is suitable for application in enclosures in atmospheres with flammable gases or
combustible dust. For use in flammable gases these enclosures must satisfy the requirements according to
IEC/EN60079-0 and IEC/EN60079-7. For use in combustible dust these enclosures must satisfy the requirements
according to IEC/EN60079-0 and IEC/EN60079-31.
Regarding the use of accessories the instructions of the manufacturer must be followed.
Schedule of Limitations:
The WDK/WDK PE terminals are suitable for use in enclosures in atmospheres with flammable gases or
combustible dust. For flammable gases these enclosures must satisfy the requirements according to EN 60079-0
and EN 60079-7. For combustible dust the enclosure must satisfy the requirements according to EN 60079-0 and EN
60079-31.
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 enclosure (EN60079-31) 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 110 °C under any condition.
T6 (- 60°C ... +40 °C)
T5 (- 60°C … +55 °C)
T4 (- 60°C ... +70 °C)
When using the type WDK/WDK PE especially with other terminal blocks series or sizes or accessories the
requirements for clearance and creepage distances according to table 1 of EN 60079-7 must be observed.
Regarding the use of covers, cross-connectors and end brackets the instructions of the manufacturer must be
followed.
For cross connection accessories, current rating, resistance across the terminal and torque values please refer to the
table under “technical data” above.
The terminal can be used with either one or two wires into either side of the terminal. When two wires are used they
must be of the same type, and of equal sizes. 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.
Version: WDK 2.5/WDK 2,5 PE 7556285 Index: 02 Date: 06.2019
3