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2. Grid-tie inverter - Wikipedia

   en.wikipedia.org/wiki/Grid-tie_inverter

   Grid-tie inverters are designed to disconnect quickly from the grid if the utility grid goes down. In the United States, there is an NEC requirement [ 2 ] that in the event of a blackout, the grid tie inverter shut down to prevent the electricity it generates from harming persons repairing the power grid.

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4. Split-phase electric power - Wikipedia

   en.wikipedia.org/wiki/Split-phase_electric_power

   Generator sets used for construction sites are equipped to supply it directly. However, a large farm may be given a 230–0–230 (nominal) supply. An incidental benefit is that the filaments of 110 V incandescent lamps used on such systems are thicker and thus mechanically more rugged than those of 240 V lamps.

5. Distribution transformer - Wikipedia

   en.wikipedia.org/wiki/Distribution_transformer

   The other end of the three secondary windings and the neutral are brought down the service drop to the service panel. 230 V loads are connected between any of the three-phase wires and the neutral. Because the phases are 120 degrees from each other, the voltage between any two phases is sqrt(3) * 230V = 400V, compared to the 2 * 120V = 240V in ...

6. Electric power distribution - Wikipedia

   en.wikipedia.org/wiki/Electric_power_distribution

   Both were supplanting gas lighting systems, with arc lighting taking over large-area and street lighting, and incandescent lighting replacing gas lights for business and residential users. The high voltages used in arc lighting allowed a single generating station to supply a string of lights up to 7 miles (11 km) long. [ 4 ]

7. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   Single-phase 6-50 is commonly used on farms for silo unloaders, and is used with a 6-gauge flexible power cord up to 200 ft (61 m) long. The 6-50 receptacle charges electric vehicles at the same 32- or 40-ampere maximum from charging stations , on a short cord, as the more versatile 14-50 with its fourth prong neutral not used currently for any ...

8. Pad-mounted transformer - Wikipedia

   en.wikipedia.org/wiki/Pad-mounted_transformer

   Single- and three-phase pad-mounted transformers are used in underground industrial and residential power distribution systems, where there is a need for safe, reliable, and aesthetically appealing transformer design. Their enclosed construction allows the installation of pad-mount transformers in public areas without protective fencing.

9. Disconnector - Wikipedia

   en.wikipedia.org/wiki/Disconnector

   In high-voltage or complex systems, these locks may be part of a trapped-key interlock system to ensure proper sequence of operation. In some designs, the disconnector has the additional ability to earth the isolated circuit thereby providing additional safety. Such an arrangement would apply to circuits that inter-connect power distribution ...