| 1. | Conduit systems for electrical installations : part 2-1: particular requirements for rigid conduit systems: EN 50086 -2-1/A11: December 1998 / European Commitee for Electrothecnical StandardizationData Publicação: 1998 Tema: Normas |  | |
| 2. | ISO / IEC 17020 : general criteria for the operation of various types of bodies performing inspectionData Publicação: 1998 Tema: Normas | | |