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2. Transfer switch - Wikipedia

   en.wikipedia.org/wiki/Transfer_switch

   A transfer switch is an electrical switch that switches a load between two sources. Some transfer switches are manual, in that an operator effects the transfer by throwing a switch, while others are automatic and trigger when they sense one of the sources has lost or gained power. An Automatic Transfer Switch (ATS) is often installed where a ...

3. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   A tower type UPS with one IEC 60320 C14 input and three C13 outlets. A large data-center-scale UPS being installed by electricians. An uninterruptible power supply ( UPS) or uninterruptible power source is a type of continual power system that provides automated backup electric power to a load when the input power source or mains power fails.

4. Ammeter - Wikipedia

   en.wikipedia.org/wiki/Ammeter

   Moving magnet ammeters operate on essentially the same principle as moving coil, except that the coil is mounted in the meter case, and a permanent magnet moves the needle. Moving magnet Ammeters are able to carry larger currents than moving coil instruments, often several tens of Amperes, because the coil can be made of thicker wire and the ...

5. Distribution transformer - Wikipedia

   en.wikipedia.org/wiki/Distribution_transformer

   Distribution transformer. A distribution transformer or service transformer is a transformer that provides a final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer. [1] The invention of a practical efficient transformer made AC power ...

6. Switchgear - Wikipedia

   en.wikipedia.org/wiki/Switchgear

   Switchgear. A section of a large switchgear panel. This circuit breaker uses both SF 6 and air as insulation. In an electric power system, a switchgear is composed of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment. Switchgear is used both to de-energize equipment to allow work ...

7. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The height of a rack can vary from a few inches, such as in a broadcast console, to a floor-mounted rack whose interior is 45 rack units (200.2 centimetres or 78.82 inches) high. 42U is a common configuration. Many wall-mounted enclosures for industrial equipment use 19-inch racks.