Figure 4-3.—Example of a power-riser diagram.A simple example is the power-riser diagram shownin figure 4-3. In this example, you see the manner inwhich two electrical panels (L1 and L2) are planned forinstallation in a two-story building. As you see, notesare used to identify each piece of equipment and toindicate the number, size, and type of conductors in eachconduit. A panelboard schedule for each of the panelsshould also be included in the drawings to indicate thecomponents, such as fuses or circuit breakers, containedin the each panelboard.A schematic wiring diagram is similar to thesingle-line block diagram; however, it provides moredetailed information and the actual number of wiresused in each circuit is shown. Complete schematicwiring diagrams are usually used for unique andcomplicated systems, such as control circuits. Anexample of a schematic diagram is shown in figure 4-4.FIRE PROTECTION DIVISIONThis division includes the plans, details, andschedules that describe the fire protection systems thatare to be installed in the building. These systems caninclude, as applicable, wet-pipe or dry-pipe sprinklersystems, monitoring equipment, and alarms. Adiscussion of these systems is beyond the scope of thisTRAMAN.Figure 4-4.—Example of a schematic diagramHVAC SYSTEMS AND DRAWINGSAlthough it’s the engineers responsibility to designheating, ventilating, and air-conditioning systems, thedrafter who prepares drawings of the systems shouldhave a basic understanding of the operating principlesof each. Those principles, and a typical heating and airconditioning layout for a building, are discussed in the4-4
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