Gesellschaft für elektrische Hochleistungs­prüfungen Member of Short-Circuit Testing Liaison (STL)

Requirements

Requirements for proof of conformity

Depending on the type of certificate, the manufacturer's proof of conformity must meet the following requirements.

Proof of conformity of the type tests

The type tests relating to the main circuits must have been performed in a European test laboratory accredited according to DIN EN ISO/IEC 17025 which is:

  • a member laboratory of STL (not manufacturer test laboratory), optionally e.g. PEHLA test laboratory, or
  • an independent European test laboratory not associated to STL, or
  • an accredited manufacturer laboratory, monitored by an expert independent of the test laboratory from an STL test laboratory which does not belong to the group of companies of the product manufacturer or the test laboratory.

For type tests which do not concern the main circuit, testing in a European test laboratory ac-credited according to DIN EN ISO/IEC 17025 is sufficient. These tests include, for example:

  • tests on auxiliary circuits,
  • pressure tests,
  • burst tests (if applicable),
  • degree of protection tests,
  • EMC tests,
  • vibration and earthquake tests.

PEHLA ZERT decides on the recognition of such tests as well as further type test certificates from non-European and ISO/IEC 17025 accredited test laboratories.

The type test certificates must:

  • fully document the type test requirements of the reference standards and, where available, comply with the provisions of the STL Guides,
  • apply to a uniform identity of the type-tested objects,
  • confirm the standard-compliant design values specified in the certificate.

Type tests which, according to the standard, are only to be performed by agreement between the manufacturer and the end customer, are considered as mandatory if the corresponding design values are specified in the certificate.

For the transfer of type tests in case of:

  • changes to standards,
  • changes in product status (e.g. design changes, new suppliers of main assemblies, etc.),
  • different rated values,
  • different/multiple/derived designs,

ZP 209 (Transfer of type tests) shall apply, if applicable.

 

Proof of conformity of the routine tests

The routine tests carried out at the manufacturer’s must meet the following requirements:

  • They must be complete and in conformity with the standards,
  • The equipment and measuring instruments used shall be suitable for routine testing,
  • The measuring instruments used must be calibrated in a valid fashion in accordance with DIN EN ISO/IEC 17025 and traceable to national or international calibration standards,
  • The routine test report must document the routine tests in accordance with standards and in a comprehensible manner and must be complete.

If required, the suitability can be checked by the technical expert on a random basis, if necessary on site.

 

Proof of conformity of the design

The conformity of the product with its specific design characteristics shall meet the requirements of the product standards in relation to "Design and Manufacturing". This must be documented by a detailed and comprehensible manufacturer's declaration.
The manufacturer must have a valid quality management system certified according to ISO 9001 for the quality assurance of their development (design) at the development site concerned.

If required, the suitability can be checked by the technical expert on a random basis, if necessary on site.

 

Proof of conformity of the manufacturing (production site)

The manufacturer must have a valid quality management system certified according to ISO 9001 for the quality assurance of their development (manufacture) at the production site concerned.

If required, the suitability can be checked by the technical expert on a random basis, if necessary on site.