Eugene Larnach asked 17 hours ago
Locking receptacles appropriate for the voltage and current are used on the RV end of the cord, along with non-locking plugs on the end connecting to the pedestal. When a power feed cord is detachable from an RV, an L5-30P is usually used on the RV end of the cord. 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. A second set of magnets restores the power immediately after the neutral section has been passed. As commonly used, 10-30 and 10-50 plugs required the frame of the appliance to be indirectly grounded via a strap connecting to the neutral blade. In some London schools built in the 1960s they were used as low-voltage AC sockets, typically 12 V, 5 A from a transformer serving one or more laboratories, for microscope lamps etc. Wylex plugs and sockets continued to be manufactured for several years after BS 1363 sockets became standard and were commonly used by banks and in computer rooms during the 1960s and 1970s for uninterruptible power supplies or “clean” filtered mains supplies. NEMA 21 series devices are specified for three-pole plus neutral, five-wire grounding devices for 3-phase 120/208Y supplies.
The hot and neutral blades are angled at 45° from vertical and 90° to each other, unlike NEMA 10 devices (where the angles are 30° and 60° respectively), also the plug is slightly smaller than a NEMA 10 and larger than ordinary 5-15P plugs. The pin configuration of the Tripin appears virtually identical to modern BS 546 plugs. The ground pin is round, like those on straight-blade NEMA grounding devices. The 7-20 version has an enlarged line/hot pin. The L6 connector does not provide a neutral connection. NEMA 15 are three-pole and ground connectors (phase A, phase B, phase C, ground) rated for 208 V. Intended for delta three-phase circuits with ground and no neutral. Other types include special purpose connectors for boats, 400 Hz circuits such as used for aircraft, and direct-current applications. ML-series “Midget Locking” connectors are for 15 A applications where a larger locking connector would not fit. Locking connectors are designed so that different voltages and current ratings can not be accidentally intermated. NEMA L14 are three-pole and ground connectors rated for 125/250 V. Intended for three-pole, four-wire hot-hot-neutral-ground circuits with a nominal supply voltages of 240 or 208 V hot-to-hot and 120 V hot-to-neutral. NEMA L8 are two-pole and ground connectors rated for 480 V. Intended for three-wire hot-hot-ground circuits.
NEMA 8 devices are specified for three wire, two-pole, grounding devices for 480 volts. This is a specification for PVC insulation (other thermoplastics are permitted, but rarely used) with a nylon jacket for abrasion resistance. September 1995: BS 1363-3:1995 “13 A plugs socket-outlets adaptors and connection units – Part 3: Specification for adaptors” published. The locking coupling makes for a more reliable connection in commercial and industrial settings, where vibration or incidental impact could disconnect a non-locking connector. The NEMA 14 connectors are essentially the replacements for the older NEMA 10 connectors described above, but with the addition of a dedicated grounding connection. NEMA 13 series devices are three wire, three-pole, non-grounding devices for 3-phase, 600-volt equipment. Semi-enclosed fuses are fuse wire carriers in which the fusible wire itself can be replaced. High rupture capacity fuses may be rated to interrupt current of 120 kA. The appearance of this plug is sometimes confused with a NEMA 10 connector, rated for 240 V, but the NEMA TT-30 is a 120 V device. The NEMA TT-30 (TT stands for Travel Trailer) connector is a 120 V 30 A recreational vehicle standard (hot-neutral-ground), also known as RV 30. The TT-30R receptacle is commonly available in nearly all RV parks in the United States and Canada, and all but the largest RVs manufactured since the 1970s use this plug to connect to power feeds.
NEMA 10s are classified as 125/250 V non-grounding (hot-hot-neutral), and were designed to be used in a manner that indirectly grounds the appliance frame to the neutral, which was common before the requirement of a separate safety ground was incorporated in the National Electrical Code. Standardization in the field of cables is performed by the group ISO /IEC JTC1/ SC25/WG3 international and national organizations such as the TIA / EIA (Electronic Industries Association/Telecommunications Industries Association) in the United States. Relying on the neutral conductor was a legal grounding method for electric ranges and clothes dryers, under the National Electrical Code from the 1947 to the 1993 editions (banned in 1996 edition). The 6-50 is a smaller size receptacle lacking a neutral fourth prong, exclusively providing 240 V, also used for electric vehicle charging station purposes. 7-30 is a larger diameter connector, with an L-shaped neutral, while the 7-50 has an enlarged neutral pin, compared with the hot. NEMA 22 series devices are specified for three-pole plus neutral, five-wire grounding devices for 3-phase 277/480Y supplies. NEMA 14-50 devices are frequently found in RV parks, since they are used for “shore power” connections of larger recreational vehicles. 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 electric vehicle charging purposes.
For those who have almost any inquiries about in which as well as the best way to use what is electric cable, you are able to e-mail us in our own web site.