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The National Electrical Safety Code (NESC) or ANSI Standard C2 is a United States standard of the safe installation, operation, and maintenance of electric power and communication utility systems including power substations, power and communication overhead lines, and power and communication underground lines.
Protective collar depth for sockets With single-phase sockets (T11, T13, T21, T23) the protective collar is 13 mm (+5 mm) deep, with three-phase sockets (T15, T25) 17.5 mm (+1 mm) deep. Dimensions of the connector Plugs according to T11 and T21 are between 13 mm and 14.5 mm wide, those according to T13 and T23 between 14.5 mm and 20 mm wide.
Schuko sockets can accept two-pin unearthed Europlug (CEE 7/16) and CEE 7/17. Less safely, Schuko plugs can be inserted into many two-pin unearthed CEE 7/1 sockets and into some sockets with a different form of earth connection that will not mate with the earth contacts on the Schuko plug (e.g., some variants of the Danish socket).
An electrical junction box (also known as a "jbox") is an enclosure housing electrical connections. [1] Junction boxes protect the electrical connections from the weather , as well as protecting people from accidental electric shocks .
Box connectors join conduit to a junction box or other electrical box. A typical box connector is inserted into a knockout in a junction box, with the threaded end then being secured with a ring (called a lock nut ) from within the box, as a bolt would be secured by a nut.
Washer pits and boxes vary in size and shape, but a standard for one-hole washers is 16 by 16 by 4 inches (410 mm × 410 mm × 100 mm), with a cylindrically-shaped cup (4 + 1 ⁄ 2 in [110 mm] in diameter and 5 in [130 mm] in height) located in its upper surface. Boxes are placed approximately 20 feet (6.1 m) away from each other, a distance ...
A diagram of a traditional French drain. A French drain [1] (also known by other names including trench drain, blind drain, [1] rubble drain, [1] and rock drain [1]) is a trench filled with gravel or rock, or both, with or without a perforated pipe that redirects surface water and groundwater away from an area.
It spends the day at a depth of 1–3.7 km (0.62–2.30 mi), and at night it rises into the upper water column, usually remaining below 85 m (279 ft), but on rare occasions venturing to the surface. [ 1 ] [ 5 ] This species may be more tolerant of low dissolved oxygen levels than sharks in the related genera Euprotomicrus and Squaliolus . [ 6 ]