Patent classifications
H
ELECTRICITY
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H02
GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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H02J
ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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9/00
Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
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H02J9/04
in which the distribution system is disconnected from the normal source and connected to a standby source
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H02J9/06
with automatic change-over; , e.g. UPS systems
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