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A three-phase motor is more compact and less costly than a single-phase motor of the same voltage class and rating, and single-phase AC motors above 10 hp (7.5 kW) are uncommon. Three-phase motors also vibrate less and hence last longer than single-phase motors of the same power used under the same conditions. [32]
NEMA (National Electrical Manufacturers Association) contactors and motor starters are rated by sizes. These sizes are grouped by rated current and power . [ 1 ] [ 2 ]
NEMA L19 series devices are three-pole, four-wire, non-grounding devices for three-phase 277/480-volt devices. Designs exist for 20-ampere (L19-20), and 30-ampere (L19-30) devices, and L19-20 and L19-30 devices were commercially available from at least one manufacturer (Bryant Electric).
The guns are available in 12, 20, 28 and 32 gauges, and .410 bore.[1] At present, it is not commercially available, only parts are available on request. MTs255-12 (МЦ255-12) – police version (for ammunition 12/70 and 12/76), designed for law enforcement and security agencies, is distinguished by accessories made of black plastic, folding ...
Other three-phase voltages, up to 830 volts, are occasionally used for special-purpose systems such as oil well pumps. Large industrial motors (say, more than 250 hp or 150 kW) may operate on medium voltage. On 60 Hz systems a standard for medium voltage equipment is 2,400/4,160 V whereas 3,300 V is the common standard for 50 Hz systems.
A small, early 1960s-vintage motor control center for 480 volt motors. A motor control center ( MCC ) is an assembly to control some or all electric motors in a central location. It consists of multiple enclosed sections having a common power bus and with each section containing a combination starter, which in turn consists of motor starter ...
So, it seemed suspicious when its three-person police department asked regulators to buy 90 machine guns, including an M134 Gatling-style minigun capable of shooting up to 6,000 rounds of ...
Semko 17 were 3/4-pin 3-phase connectors, with (4-pin) or without (3-pin) a neutral connector. Earth were provided via the shield. The connectors were available in different sizes, 16 A with rounded corners; 25 A and 63 A were rectangular. These connectors were used mainly in industrial and agricultural installations.