Document of Conformity

IECEx Certificate

of Conformity

Certificate No: IECEx ULD 15.0003U Issue No: 1

Date of Issue: 2019-01-30

Schedule

Ex Component(s) covered by this certificate is described below:

Feed through terminal blocks type WDKare for the connection of copper conductors in enclosures. The type of protection is increased

safety, “e”, insulating parts made of Wellamid, with optional accessories, type WQV screw in cross-connectors, type ZQV plug-in cross-

connectors, type LS2.8 shield bus, type WEW end brackets, type WTW partitions and type WAP-WDK end plates for fixing on mounting rails.

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Please see Annex for additional information.

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SCHEDULE OF LIMITATIONS:

The feed through and protective conductor terminal blocks 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 IEC 60079-0 and IEC 60079-7.

For combustible dust these enclosures must satisfy the requirements according to IEC 60079-0 and IEC 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 (IEC 60079-31) in type of protection “t”.

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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. T1as 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).

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When using the types WDK and WPE with other terminal blocks series or sizes or accessories the requirements for clearance and

creepage distances according to table 1 of IEC 60079-7 must be observed. Regarding the use of covers, cross-connectors and end

brackets the instructions of the manufacturer must be followed.

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For cross connection accessories current rating, resistance across the terminal please refer to the table under “types & electrical

rating” above. Details on creepages and clearance values and the required torque values please see Notice to installers.

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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.

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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.

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Unused terminals shall be tightened.

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