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Power installations exceeding 1 kV a.c. and 1,5 kV d.c. - d.c. Ingestion-build-117251 What is BS EN IEC1 Scope This part of IEC 61936 provides, in a convenient form, common rules for the design and the erection of electrical power installations in systems with nominal voltages above 1,5 kV d. c., so as to provide safety and proper functioning for the use intended. This technical specification does not apply to the design and erection of any of the following: overhead and underground lines between separate installations; electric railways; mining