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Audel electrical course for apprentices and journeymen - Rosenberg P.

Rosenberg P. Audel electrical course for apprentices and journeymen - Wiley & sons , 2004. - 424 p.
ISBN: 0-764-54200-1
Download (direct link): audelelectricalcourseforapprentices2004.pdf
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1. Rotating Equipment: At motor and generator locations, note on the drawing adjacent to the symbol the horsepower of each motor, or the capacity of each generator. When motors and generators of more than one type or system characteristic, e.g., voltage and phase, are required on a given installation, the specific types and system characteristics should be noted at the outlet symbol.
2. Switchboards, Power Control Centers, Unit Substations, and Transformer Vaults: The exact location of such equipment on the electrical layout floor plan drawing should be shown.
A detailed layout, including plan, elevation, and sectional views, should be shown when needed for clearness showing the relationship of such equipment to the building structure or other sections of the electric system.
A single line diagram, using American Standard Graphic Symbols for Electrical Diagrams—Y32.2, should be included to
26 Chapter 3
show the electrical relationship of the components of the equipment to each other and to the other sections of the electric system.
E. Symbols Not Included in This Standard
1. Certain electrical symbols that are commonly used in making electrical system layouts on drawings are not included as part of this standard for the reason that they have previously been included in American Standard Graphic Symbols for Electrical Diagrams, W32.2.
ASA policy requires that the same symbol not be included in two or more standards. The reason for this is that if the same symbol was included in two or more standards, when a symbol included in one standard was revised, it might not be so revised in the other standard at the same time, leading to confusion as to which was the proper symbol to use.
2. Symbols falling into the above category include, but are not limited to, those shown in Table 3-2. The reference numbers are the American Standard Y32.2 item numbers.
Table 3-2 Symbols Included in Two or More Different Standards
46.3 Electric motor
46.2 Electric generator
86.1 Power transformer
82.1 Pothead (cable termination)
48 Electric watt-hour meter
12.2 Circuit element, e.g., circuit breaker
11.1 Circuit breaker
Electrical Symbols 27
Table 3-2 (continued)
36 Fusible element
76.3 Single-throw knife switch
76.2 Double-throw knife switch
13.1 Ground
7 Battery
List of Symbols
1.0 Lighting Outlets
See Table 3-3 for a list of lighting outlet symbols.
Table 3-3 Lighting Outlet Symbols
Ceiling
Wall
1.1 Surface or pendant incandescent mercury vapor or similar lamp fixture
1.2 Recessed incandescent mercury vapor or similar lamp fixture
1.3 Surface or pendant individual fluorescent fixture
1.4 Recessed individual fluorescent fixture
1.5 Surface or pendant
continuous-row fluorescent fixture
(continued)
28 Chapter 3
Table 3-3 (continued)
Ceiling Wall
.6 Recessed continuous-row fluorescent fixture*
.7 Bare-lamp fluorescent strip**
.8 Surface or pendant exit light .9 Recessed exit light .10 Blanked outlet
.11 Junction box
.12 Outlet controlled by low-voltage switching when relay is installed in outlet box
*In the case of combination continuous-row fluorescent and incandescent spotlights, use combinations of the above standard symbols.
**In the case of continuous-row, bare-lamp fluorescent strip above an area-wide diffusing means, show each fixture run, using the standard symbol; indicate area of diffusing means and type by light shading and/or drawing notation.
2.0 Receptacle Outlets
Where all or a majority of receptacles in an installation are to be of the grounding type, the uppercase-letter abbreviated notation may be omitted and the types of receptacles required noted in the drawing list of symbols and/or in the specifications. When this is done, any nongrounding receptacles may be so identified by notation at the outlet location.
Where weather-proof, explosion-proof, or other specific types of devices are required, use the type of uppercase subscript letters referred to under Section 0.2 item A-2 of this standard. For example, weather-proof single or duplex receptacles would have the uppercase subscript letters noted alongside of the symbol (see Table 3-4).
© -® 1
@ —@ 1
® -® 1
© -© 1
© -© 1
Electrical Symbols 29
Table 3-4 Symbols for Receptacle Outlets
Ungrounded Grounding
=(=)r =©rg
© ~©G
© “©G
2.1 Single receptacle outlet.
2.2 Duplex receptacle outlet.
2.3 Triplex receptacle outlet.
2.4 Quadruplex receptacle outlet.
2.5 Duplex receptacle outlet—split wired.
2.6 Triplex receptacle outlet—split wired.
2.7 Single special-purpose receptacle outlet.*
2.8 Duplex special-purpose receptacle outlet.*
2.9 Range outlet.
2.10 Special-purpose connection or provision for connection. Use subscript letters to indicate function (DW—dishwasher;
CD—clothes dryer, etc.)
2.11 Multi-outlet assembly.
(Extend arrows to limit of installation. Use appropriate symbol to indicate type of outlet. Also indicate spacing of outlets as x inches.)
2.12 Clock hanger receptacle.
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