About: back-up power

Premodifier: back-up
Head noun: power

Same concepts
http://dbpedia.org/resource/Uninterruptible_power_supply

Broader concepts

label	provenance	confidence
low-voltage installation	isap:427837952	0.363450
need	isap:205378102	0.278142

Narrower concepts

label	provenance	confidence
battery	isap:33695531	0.357704
up	isap:464924241	0.282072