BS 142-4-4.2:1984 PDF Download
$151.00Electrical protection relays. Requirements for multi-input energizing quantity relays-Specification for directional relays and power relays
standard by BSI Group, 04/30/1984
BSI Group
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Electrical protection relays. Requirements for multi-input energizing quantity relays-Specification for directional relays and power relays
standard by BSI Group, 04/30/1984
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Appendices
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