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In North America, fuses were used in buildings wired before 1960. These Edison base fuses would screw into a fuse socket similar to Edison-base incandescent lamps. Ratings were 5, 10, 15, 20, 25, and 30 amperes.
Plugs fitted with BS 546 fuses have been optional since the original BS 546:1934 with maximum fuse ratings of 2 A in the 2 A plug, and 5 A in the 5 A, 15 A and 30 A plugs. In practice most BS 546 plugs are unfused with fused versions being unusual and expensive. The 15 ampere (A) sockets were generally given a dedicated 15 A circuit. Multiple 5 ...
All NEMA 6 devices are three-wire grounding devices (hot-hot-ground) used for 208 and 240 V circuits and rated for 250 V maximum, with the 6-15, 6-20 and 6-30 being grounding versions of the 2-15, 2-20 and 2-30, respectively. The 6-15 resembles the 5-15, but with collinear horizontal pins, spaced 23 ⁄ 32 in (18.3 mm) center-to-center. The 20 ...
[15] [16] The design was based on an American plug and socket-outlet first intended for use at 120 V which was patented in 1916 under U.S. patent 1,179,728 by Harvey Hubbell. [17] By the early 1930s this design had been up-rated to 250 V 10 A capacity and Hubbell had supplied the Australian electrical industry with his sockets. [ 18 ]
These fuses are larger and have higher ratings than the screw type fuses, exceeding 100 kA. NH fuses are widespread in industrial plants as well as in public mains electricity applications, e.g., in electrical substations and electrical distribution boards , or in house junction boxes in buildings.
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