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Organisations concerned with testing high voltage electrical power equipment shall be eligible for membership and shall have at least one test facility available for direct short-circuit testing at 500 MVA, 3 phase as a minimum. Each organisation shall be widely recognised as a competent testing organisation independent of particular manufacturer or user interests and that it can actively participate in the work of STL.
There shall be only one member or applicant per country or group of countries.

Members of STL are:

..
CESI, Italy
CPRI, India
ESEF ASEFA, France


For ASTA Intertek
see information below


JSTC, Japan
KEMA, The Netherlands
KERI, South Korea
PEHLA, Germany
SATS, Norway
STLNA, USA
VEIKI, Hungary
ZKU, Czech Republic


For more information about the member: click on the member-logo.

Pursuant to the decision of the STL Management Committee, ASTA Intertek is from May 22, 2024 no longer a member of STL.
The reason is that ASTA Intertek since 2022 has not fulfilled the requirement of the STL Constitution
of having a Member Laboratory with the ability to perform direct short-circuit tests at 500 MVA.

STL remains an open and non-discriminatory organization committed to operate in compliance with its Constitution.


Data according to STL Membership Directory issue 48 dated 2021-05-04