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Ufer ground.

Name after the man who invented and tested it, a Ufer ground is a grounding electrode consisting of at least 20 feet (6 m) of 1/2-inch (13 mm) rebar (either a continuous single bar or shorter lengths tied-wired together) or of at least 20 feet of wire-size 4 AWG or larger copper wire embedded in a concrete footing or piling.

Ungrounded.

An electrical power distribution system that is not connected to earth ground or to a conductive body that extends the ground connection.

Uninterruptible Power Supply (UPS).

A self-contained, battery backed-up regulated power supply.

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