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This Standards Publication covers Class 2 transformers intended primarily for use in 30 volts rms maximum low-voltage residential control circuits. It includes definitions, electrical ratings, performance standards, mounting dimensions, and marking requirements.
INTRODUCTION One of the strongest earthquakes ever to hit California shook hundreds of post-tensioned buildings on October 17, 1989, with an intensity of 7.1 on the Richter scale. The earthquake, named Loma Prieta, had its epicenter approximately 65 miles southeast of downtown San Francisco (Figure...
INTRODUCTION In the summer of 1989, a parking structure adjoining an office building in the Inner Harbor area of downtown Baltimore, Maryland, was demolished to make room for an expansion to the existing office tower. This post-tensioned concrete parking structure was built in 1974, and thus, had...
This Standards Publication applies to surface-type control thermostats and temperature-limiting
INTRODUCTION Most concrete structures develop cracks for one reason or another. In most cases, cracks do not impair the expected performance of the structure. Some cracks, on the other hand, may be detrimental by leading to excessive deflections, exposure to corrosive environment, and possibly...
Introduction Over the past twenty years the use of post-tensioned flat slabs in building construction has dramatically increased. In the mid 1970's designers began to use banded tendons (see Fig.1) for flat slab design. The width of a typical band of tendons may be eight times the slab thickness...
This Standards Publication covers the operating range, differential, electrical ratings, and dimensions of electric-switch-type
INTRODUCTION The search for economical foundations for residential and light commercial construction following World War II led to the use of ground supported reinforced concrete slabs, commonly referred to as "floating slabs." During the mid 1960's, the use of post-tensioned prestressed concrete...
This Standards Publication covers line-voltage integrally mounted thermostats for electric heaters and contains definitions, ratings, construction features, performance, marking, and application information.
