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A PAR56, for example, is 56 eighths of an inch (7 inches) in diameter; a PAR36 is 36 eighths (4.5 inches) in diameter, and so on. Similarly, the diameter in millimeters can be found by multiplying the PAR designation by 3.175. For example, a PAR16 lamp is approximately 2 inches or 50.8 mm in diameter. [1]
Lighting and general purpose receptacles are at 120 volts AC, with larger devices fed by three wire single-phase circuits at 240 volts. In commercial construction, three-phase circuits are often used. Common 3 phase configurations within a building are 208v/120 wye, 120/240 center tapped delta and 480v/277v wye. Lighting is usually fed by 277 V ...
A diagram of a Selecon Performance Lighting Pacific Zoomspot. The truncated conical ellipse allows better focusing abilities for the light. If the bulb is placed in the first focus, then all light will pass through the second focus at the same time. This creates a very bright beam of light. [1] ERS or profile lanterns have many useful features.
120 V circuits are the most common, and used to power NEMA 1 and NEMA 5 outlets, and most residential and light commercial direct-wired lighting circuits. 240 V circuits are used for high-demand applications, such as air conditioners , space heaters , electric stoves , electric clothes dryers , water heaters , and electric vehicle charge points .
They are also found on some RVs for connecting to shore power. RVs in the US are equipped for 120 V 30 A or 240 V 50 A service, and use a cord to connect to a receptacle at the campsite, usually on a power pedestal with one or more receptacles providing 120 V 30 A (TT30R), 240 V 50 A (14-50R), or 120 V 15/20 A (5-20R) service.
So if A–B, B–C and C–A are all 240 volts, then A–N and C–N will both be 120 volts, but B–N will be 208 volts. Other types of three-phase supplies are wye connections, ungrounded delta connections, or corner-grounded delta [2] (ghost leg configuration) connections. These connections do not supply split single-phase power, and do not ...
On the right, a lighter, smaller 16,640-US-gallon (62,989 L; 13,856 imp gal) capacity tank car has a higher load limit of 204,300 pounds (92,700 kg). It is stenciled and placarded for 50% sodium hydroxide aqueous solution, which has a specific gravity of 1.5. This car is also equipped with an insulating jacket and external heating pipes to melt ...
A cloudburst is an enormous amount of precipitation in a short period of time, [1] sometimes accompanied by hail and thunder, which is capable of creating flood conditions. Cloudbursts can quickly dump large amounts of water, e.g. 25 mm of the precipitation corresponds to 25,000 metric tons per square kilometre (1 inch corresponds to 72,300 ...
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