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Below is a preview of the NEC. ORG for the complete code section. N A Services. For a service rated amperes through amperes, the service conductors supplying the entire load associated with a one-family dwelling, or the service conductors supplying the entire load associated with an individual dwelling unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than 83 percent of the service rating. If no adjustment or correction factors are required, Table N B Feeders.
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In a single-phase or 3-phase for that matter AC electrical power distribution system, both the load current as electrical utilization loads are connected and the applied voltage that causes it to flow are transmitted along the length of the circuit conductors varying in amplitude with time and periodically reverse between positive and negative polarities.
The generation of the AC power within the alternator AC generator or dynamo creates a sine waveform of voltage and current that has one positive alternation and one negative alternation per cycle as demonstrated in Figure 1.
For small-scale electrical-power generation as illustrated in Figure 2 , the generation of AC power is normally limited to a single-phase AC source. According to the winding and wiring configuration within the alternator, the passing of either the south or north pole of the rotating magnet, which would constitute mechanical degrees, will generate either a positive or negative alternation of the electrical power from zero power to a positive or negative peak of power, and back to zero power in electrical degrees.
Figure 1. Generation of single-phase AC power. Figure 2. Small-scale single-phase AC electrical-power generation. In another quarter turn or the next 90 0 , the induced voltage goes from the peak of its first alternation back to zero volts, because the length of the magnet will again be parallel to the length of the winding.
At the end of this first alternation, the poles of the magnet are reversed, with the North Pole now at the top of the drawing and the South Pole at the bottom. The passing of the north pole of the rotating magnet constitutes another mechanical degrees.
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