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BS 7639:1993
M00000190
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BS 7639:1993 Short-circuit current calculation in three-phase a.c. systems
standard by BSI Group, 04/15/1993
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Specifies a procedure for the calculation of systems operating at 50 Hz or 60 Hz with nominal voltage up to 380 kV.Replaced by BS EN 60909-0:2001 but remains current.