Sentences. 1 The emergency generator system automatically activates1 The emergency generator system automatically activates 2 The emergency generator provides 3The emergency system is 4The emergency generator control unit monitors 5 The emergency generator control unit disconnects 6 Equipment on essential ac and dc number one buses must be capable 7 When the emergency generator activates 8Dc power goes through the dc essential 9 If both engines fail, 10 Only the ac essential and dc essential number one buses 11The term grounded system means 12 The letter N designates 13 Grounding three-wire systems can be done 14In four-wire systems, 15A disadvantage of a grounded system is 16The term ungrounded system means B a that the circuit in no way connects to ground. b that short circuits result when a bare spot on any ungrounded conductor touches ground. c the neutral is ground. d by grounding one of the phases, usually the B-phase in aircraft. e any wire that completes the equipment circuit to the ground network. f that one leg of the system connects to a common conductor. g receive power. h the wind milling effect drives the emergency generator below normal performance levels. i power transfer relays to the dc essential and AFCS buses. j ac power routes through both transfer relays to essential ac buses k of operating on below normal voltage in an emergency. l the essential ac and dc power transfer number two relays. m ac output and regulates the output at 115 volts. n completely self-sufficient and independent of the primary and secondary power sources. o ac and dc power to the essential bus circuits when normal power fails. p when the left main dc bus loses power.
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