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Systems & Data Center · Foundational

Backup Generator

An engine-driven generator, typically diesel, that supplies long-duration power to a facility during utility outages.

Definition

Generators start within seconds and take over through an automatic transfer switch, while the UPS bridges the gap. Fuel storage, refueling contracts and regular load testing are critical.

Example

Generators are load-tested monthly and hold 48 hours of on-site fuel.

Exam tip

The UPS covers the seconds until the generator starts; generators provide long-duration runtime.

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