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The standard power frequency in North America is 60 Hz. Most electrical utility AC generators have two poles and are driven by fossil-fueled steam turbines. From the equation above, it can be determined that with two poles, rotor speeds must be 3600 rpm for 60 Hz and 3000 rpm for 50 Hz AC. By contrast, AC generators driven by steam turbines with the steam produced by nuclear reactors have lower speed requirements. They are typically four-pole machines with rotor speeds of only 1800 rpm for 60 Hz or 1500 rpm for 50 Hz AC.
The alternating voltage appears at the stator windings and is brought out directly through insulated leads from the stationary armature. Because most utility AC generators run at constant speed, the voltage generated depends on field excitation. The rotating field is supplied with 120 or 240 V DC from a separate small DC generator called an exciter through two slip rings and brushes. This arrangement permits the generated voltage to be controlled by adjusting the amount of field excitation supplied to the exciter.
The master specification might be the result of years of accumulated experience of an engineering or architectural firm, or it could be a document prepared by an industry-sponsored institute based on the collective experience of its members. Regardless of the specification’s origin, it is the specifications writer’s task to modify or “tailor” it to fit a specific project. After all of the applicable general paragraphs have been selected, they are supplemented with the additional information required to identify the desired materials, equipment, products, and devices, and perhaps even specify the methods or procedures required for the performance of the work.