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TLFeBOOK
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WALL-MOUNTED RECEPTACLES AND PLUGS
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illumination This technology is most effective in classrooms, computer rooms, large conference rooms, and areas where the ability to sense small motions is critical The choice of the technology selected depends on factors such as the kinds of activities that occur in the desired coverage area, physical limitations in mounting the sensor, or barriers and obstacles that would obstruct the sensor s coverage within the area
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Wall-Mounted Receptacles and Plugs
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The three general classes of receptacles and plugs are:
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I Straight-blade nonlocking, for general residential and commercial applications I Locking-type, primarily for powering heavy-duty power tools I Pin-and-sleeve devices, for making high-voltage industrial electrical connections
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There are also many different specialized receptacles based on the straight-blade nonlocking receptacle design, which include:
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I Ground-fault circuit interrupter (GFCI) receptacles I Isolated-ground receptacles I Surge-protective receptacles
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Appendix A includes the NEMA configurations for straight-blade nonlocking and curved-blade locking plugs and receptacles and their circuit wiring diagrams
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STRAIGHT-BLADE RECEPTACLES AND PLUGS
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Straight-blade, nonlocking receptacles are made so that mating plugs can be inserted directly into them to make an electrical connection and they can be easily removed by pulling them straight out Figure 6-16 illustrates the blade and prong profiles of NEMA straight-blade receptacles with ratings from 15 to 50 A The 15-A, 125-V two-blade (two-pole), two-wire receptacle is no longer approved , for new construction The different widths of the parallel slots to accept a narrow and a wide plug blade were intended to assure that the connection would be polarized These receptacles were standard for circuits in US homes until about 1958 However, because the white neutral wire did not always ground stray current from loose wires or malfunctioning appliances, a third bare or green insulated copper ground wire was proposed as an additional safety feature, and it became standard on all residential wiring The new receptacles had a U-shaped hole to accept a plug prong in addition to the wide and narrow slots to accept the wide and narrow plug blades The prong in the plug was intended to provide more reliable grounding It is wired through the line cord to appliances to drain off any leakage current and route it to ground The adoption of this three-prong plug-and-receptacle combination led eventually to the acceptance of three-wire branch-circuit cable as the standard It was found that the
TLFeBOOK
WIRE, CABLE, AND CIRCUIT COMPONENTS
Figure 6-16 NEMA straight-blade receptacles rated 15 to 50 A and 125 to 250 V AC Abbreviations: P poles, W grounding, N-G nongrounding Plug patterns are typically mirror images of receptable patterns
task of connecting metal conduit and bare wire outside the cable to form a separate ground connection was not only labor-intensive and costly, but was unreliable Single-phase, two-pole, three-wire grounding receptacles rated 15 and 20 A at 125 V AC are the most popular receptacles for installation in all new homes and buildings, and they replace the older receptacles and wiring in all updated electric service However, two-prong plugs are still widely used on line cords for many different 120V household appliances, from table lamps, toasters, and hair dryers to vacuum cleaners
TLFeBOOK
WALL-MOUNTED RECEPTACLES AND PLUGS
as well as stereos, TV sets, and computer printers On the other hand, three-prong plugs terminate extension cords and line cords for power tools, desktop computers, and window-mounted air conditioners In most homes the number of single-phase 15-A receptacles exceeds the number of 20A receptacles Single-phase 30- and 50-A 125/250-V AC receptacles are specified for major appliances such as ranges, ovens, clothes dryers, and large room air conditioners The plugs on the line cords for those appliances dictate the specific service required Nonlocking plugs and receptacles have ratings of 15 to 60 A and 125 to 347 V AC The single-phase voltage ratings are 125, 250, 277, and 347 V, as well as 125/250 V The three-phase voltage ratings are 250 V AC, and the three-phase Y ratings are 120/208 V AC The straight-blade plug profiles, with the exception of those for three-pole, threewire, 125- and 250-V 20-A service, are mirror images of their receptacle profiles The , different blade and prong profiles are intended to prevent accidental insertion of lower-rated appliance plugs in higher-rated outlets For more information on straight-blade surge-protective receptacles, see Chap 12 Receptacles are manufactured in four general grades: hospital, industrial, commercial, and and residential The hospital-grade receptacles are durable premium products that have additional safety features Industrial-grade receptacles are also made to withstand abuse However, the differences among all of these receptacle grades are generally related to the choice and quality of materials used in their construction, and this is reflected in their prices Regardless of grade, receptacles should at least be UL listed, CSA certified where applicable, and meet or exceed NEMA and ANSI standards
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