Electrotechnical products are product-tested pursuant to ČSN EN in the EZÚ Prague (AO 201) national test laboratory.

In cases where European standards are harmonised with IEC, internationally valid CB certificates are issued for these products based on tests. Based on the granted licence, these products are marked with the ESČ symbol. Pursuant to Law No. 22/97 Coll. and the Governmental Ordinance No. 17/2003 Coll., the declaration of conformity is issued for the products. The products are marked with the CE symbol. RSA terminal blocks comply with seismic resistance pursuant to ČSN IEC 980:1993 and related standards. Selected products are furthermore also certified in test laboratories abroad (KEMA-KEUR – the Netherlands).