Short-circuit currents in three-phase a.c. systems - Calculation of currents Ingestion-build-251241 Supply chain management and customer

Supply chain management and customer service

NOTE The requirements for testing the ventilators are dealt with in ISO 21927‑3

or with fixed extinguishers

BS ISO 725:2009 ISO inch screw threads

Short-circuit currents in three-phase a.c. systems - Calculation of currents Ingestion-build-251241 Supply chain management and customer1 Scope This part of IEC 60909 is applicable to the calculation of short circuit currents in low voltage three phase AC systems, and in high voltage three phase AC systems, operating at a nominal frequency of 50 Hz or 60 Hz. Systems at highest voltages of 550 kV and above with long transmission lines need special consideration. This part of IEC 60909 establishes a general, practicable and concise procedure leading to results which are generally of