Reinforcing bars shall be permitted to be bonded together by the usual steel tie wires or other effective means.1 (12.7-mm) diameter, or consisting of at least 20 ft (6.1 m) of bare copper conductor not smaller than No. (50.8 mm) of concrete, located within and near the bottom of a concrete foundation or footing that is in direct contact with the earth, consisting of at least 20 ft (6.1 m) of one or more bare or zinc galvanized or other electrically conductive coated steel reinforcing bars or rods of not less than ½-in. The concrete-encased electrode is described in Section 250-50(c) of the NEC, which reads: The concrete-encased electrode is often referred to as a Ufer ground, although the word “Ufer” does not appear in the text of the Code. An effective, reliable grounding electrode or grounding electrode system is required to be used where electrical services and systems are employed. The grounding electrode system is the foundation of the electrical safety system. The grounding electrodes required to be used make up the grounding electrode system and are required to do so because they are inherent to the construction of the building. Electrical systems and metal enclosures are grounded to limit the voltage on them due to contact with higher voltage lines protect against lightning strikes and to stabilize the voltage during normal operations. The lowest possible impedance connection to the earth is sought from the grounding electrode or grounding electrode system. This is a characteristic of the building footings and foundation that are expected to be in place and continue to exist as long as the building is required to remain standing.Ī grounding electrode is defined as a conducting element that connects electrical systems and/or equipment to the earth. The word “permanent” is a substantial word related to something established to be in place for a long period of time. These structures have some commonalities both include concrete and reinforcing bars, which establish a good structural connection to the earth and are permanent elements required for the construction of either building. An example would be comparing a simple monolithic slab on grade for a single-family dwelling to a complex concrete and steel foundation for a multi-story high-rise structure. Concrete footings and foundations can vary from the elementary in design to the very complex. The larger the building, the larger the footings or foundation will need to be to carry the structural load of the building. Footings and foundations are typically constructed using concrete and reinforcing rods or bars for structural strength. For the building to be structurally sound and stable, a substantial foundation must be established to bring the structure out of the ground. Send us feedback about these examples.Most buildings or structures employ a structural design that includes a concrete footing or foundation, which connects the structure to the earth. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'encase.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. 2023 The Tank Louis Cartier also comes in two minimalist colored dial editions: one in lacquered burgundy and the other in a Platonic green, both encased in yellow gold. 2023 It’s filled with shredded memory foam, which is naturally hypoallergenic, and comes encased in a bamboo cover designed to keep you extra cool at night. 2023 The only catch: Those proteins, encased in Nagaratnam’s crystals, are small. 2022 Health Hazards While encased in their sabots, studies have shown DU shells don’t pose a significant radiological hazard to those that handle them. 2022 Of course there’s the literally breathtaking experience of getting right up to the falls - by boat and by observation decks in which you’re issued essentially a floor-length plastic bag to encase yourself, somewhat futilely, against the spray. Ben Mimscooking Columnist, Los Angeles Times, 9 Nov. 2023 The result is a flaky and super-buttery crust that works well as a base for pumpkin and pecan pies or to encase a double-crust stunner like apple pie. 2023 Tulle wrapped over knitwear, encasing it mummy like. Elizabeth Paton, New York Times, 8 Mar. Recent Examples on the Web But among the inky overcoats with bold shoulders, the long black leather jackets and solemn silhouettes that encase the body like armor, a lighter trend was taking flight: feathers.
0 Comments
Leave a Reply. |