04. January 2016

Certification: New type-examination certificates
Internally cooled Transnorm motors now also in explosion-protected design

After addition of the 1,000 A version to the partial certificate IBExU00ATEX1051U for terminal boxes with explosion protection rating “e” (increased safety) at the beginning of the year, confirmation has now also been received regarding expansion of EC type-examination certificate IBExU00ATEX1083U to include the motor types (IE.-) K4.R 355 to 450. The partial certification is at the same time approval for the mechanical design of these motors for explosion protection rating “tb” (protection by enclosure) for use in Zone 21. Furthermore, corresponding EC type-examination certificates have been obtained for the three shaft heights.

Low-voltage versions of the Transnorm series are thus now available with explosion protection ratings “e”, “n”, “tb” and “tc”. Applications for type-examination certificates for explosion-protected versions of the high-voltage series W52R 355 … to 450 with protection ratings “e”, “n” and “tb” have been submitted to IBExU Freiberg and are currently under review. Apart from the terminal boxes, the mechanical design of this series corresponds to that of the low-voltage series for which certification has already been granted.

New insulation system: A new, optimised insulation system has been introduced for the high-voltage Ex nA series and permits higher power ratings for the motors. Prototype testing is voluntary for Ex nA motors. EU legislation stipulates merely a manufacturer’s declaration of conformity for category 3 products. For this reason, there is no specification of a Notified Body on the rating plate. Only the CE mark and indication of the explosion protection are attached.

These motors can already be supplied on the basis of an EC Declaration of Conformity. Additionally, a version with explosion protection rating “tc” (protection by enclosure) for use in Zone 22 is available on a similar basis.

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