The Code Interpretation Library provides useful information on how the City interprets and applies certain regulations in the Land Development Code (Title 25 of the City Code), including site development and subdivision regulations, as well as technical (construction) codes.
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Scientists agree that even large nuclear explosions have little effect on seismicity outside the area of the blast itself. The largest underground thermonuclear tests conducted by the United States were detonated in Amchitka at the western end of the Aleutian Islands, and the largest of these was the 5 megaton test code-named Cannikin that occurred on November 6, 1971 that did not trigger any earthquakes in the seismically active Aleutian Islands.
On January 19, 1968, a thermonuclear test, code-named Faultless, took place in central Nevada. The code-name turned out to be a poor choice because a fresh fault rupture some 4,000 feet long was produced. Seismograph records showed that the seismic waves produced by the fault movement were much less energetic than those produced directly by the nuclear explosion. Locally, there were some minor earthquakes surrounding the blasts that released small amounts of energy. Scientists looked at the rate of earthquake occurrence in northern California, not far from the test site, at the times of the tests and found nothing to connect the testing with earthquakes in the area.
Damage in earthquakes depends on the strength of the ground shaking and the ability of a structure to accommodate this shaking. Building codes define the guidelines for how strong structures need to be to perform well in earthquakes and continue to evolve as engineers and scientists better understand earthquakes and how structures respond to ground shaking.
Based on the type of construction and the building code at the time when they were built, we have a pretty good understanding of what buildings are likely to be damaged in future earthquakes. A detailed scientific assessment of the likely damage in a big San Andreas earthquake in southern California (The ShakeOut Earthquake Scenario - A Story That Southern Californians Are Writing) estimated that 300,000 buildings in southern California would be damaged at a moderate level (losing at least 10% the value of the building) as modeled in the M7.8 ShakeOut scenario earthquake. Although this is a large number, it is only 1 out of every 16 buildings in the region. Most buildings will not have significant damage. Moreover, only 1,500 of those buildings will actually collapse. That is less than 1 out of 30,000 buildings in southern California. Widespread collapse of many buildings is not realistic.
12. Serial number (SN) - A unique identifier assigned incrementally or sequentially to a motor to identify it specifically. For Baldor-Reliance NEMA motors, the serial number formula is a location-year-month-day-motor code.
14. International protection rating (I.P.) - Often incorrectly interpreted as the ingress protection rating, international protection rating classifies the degrees of protection provided against the intrusion of solid objects (including body parts like hands and fingers), dust, accidental contact, and water. The IP allows for the ingress of objects into the motor, providing they cannot have any detrimental effect upon its operation. The first digit of the code indicates the level of protection that the enclosure provides against access to hazardous parts and the ingress of solid foreign objects, and the second digit indicates the protection of the equipment inside the enclosure against harmful ingress of liquid.
24. T-code - Motors for use in hazardous environments are assigned a temperature code (T-code) which describes the maximum temperature of surfaces subject to contact with hazardous materials. The temperature value defined by the T-code applies under all conditions of motor operation including burnt out, overload and locked rotor current. The T-code for a given motor must be less than the autoignition temperature (AIT) of the hazardous gas or mixture in the environment where the motor operates. Thisis to ensure that the hazardous materials do not spontaneously ignite when it contacts the motor surfaces and enclosure during operation.
NOT SHOWN Locked rotor code (CODE) - NEMA defines locked rotor [kilovolt-ampere (kVA) per horsepower (Hp)] with a series of code letters (A to V). Generally, the farther the code letter is from A, the higher the inrush current per Hp. A replacement motor with a higher code letter may require different upstream electrical equipment, such as a larger motor starter. When AC motors are started with full voltage (across-the-line starting), they draw line amperage 300 percent to 600 percent greater than their full load running current. The magnitude of the inrush current (also called locked rotor amps or LRA) is determined by motor horsepower and design characteristics.
On the left-hand side of this page is a list of the state agencies that contribute to Title 24, and a list of the code developers that publish the model codes on which parts of Title 24 are based. The acronyms shown will be used throughout these summary webpages.
Every three years the national model codes and standards are published, and by law California is required to incorporate specific model codes and standards into Title 24. The model code publishers often issue significant code change documents explaining national code updates and the reasons for them. Below are links to information about significant changes in model codes: 2ff7e9595c
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