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3: Weather-resistant. Protects against falling dirt and windblown dust, against weather hazards such as rain, sleet and snow, and is undamaged by the formation of ice. Used outdoors on ship docks, in construction work, and in tunnels and subways. 3R: As 3, but omits protection against windblown dust. 3S: As 3, but also operable when laden with ice.
These require a simple key or tool to operate, and thus discourage casual or accidental operation of the switch. [3] [4] In some devices, the switch is built into a keyed lock mechanism, which prevents unauthorized use of the device. In this type of vandal-proof system, when the key is turned in the lock, the user can turn the equipment on.
Later in 1904, he changed the design to flat blades (a design later incorporated in the NEMA 2 series), filled under the U.S. patent 774,251 Both these patents were granted in November 1904. In 1910, Hubbel worked on improving his popular flat blade design, filled U.S. patent 1,064,833 in 1912. The new design had parallel blades, a more compact ...
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President-elect Donald Trump complained on Friday that American flags would still be lowered to half-staff in honor of the late President Jimmy Carter during Trump's Jan. 20 inauguration.
In addition to the classes mentioned above, connectors are characterised by their pinout, method of connection, materials, size, contact resistance, insulation, mechanical durability, ingress protection, lifetime (number of cycles), and ease of use.
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