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PLANNING FOR ELECTRICAL DESIGN
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Because wiring diagrams are two-dimensional floor plan drawings, they do not include information about the heights of switches, receptacles, and luminaires above the floor With the exception of ceiling fixtures, which are obvious from the diagram, the heights of receptacles and switches above the floor and their separation distances are dictated by the National Electrical Code (NEC )* and local building codes In most cases the local codes will be keyed to the NEC, but they may be more specific about certain details based on local experience For example, where soil conditions are typically dry a more elaborate grounding system might be required, or more provisions for protection against lightning strikes might be required in parts of the country where there is a high incidence of lightning Any exceptions to the NEC requirements for device placement must be noted on the diagram For example, switches and receptacles might be placed at more convenient heights for the handicapped occupants or those in wheelchairs Nevertheless, it is possible for a homeowner without formal training or experience in electrical wiring to prepare an acceptable wiring diagram if all of the rules and procedures are followed A basic requirement, however, is familiarity with all of the relevant sections of the NEC, with emphasis on chapters 1 4 All submissions of wiring diagrams should be accompanied by a copy of a list of materials and a symbol key Some basic rules for the preparation of an acceptable wiring diagram are as follows
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I Draw or obtain a scaled architectural drawing of the floor area to be wired showing
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walls, doors, windows, plumbing pipes and fixtures, and heating and cooling ducts
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I Determine the floor area by multiplying the room length by width and then deduct any
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floor areas occupied by closets and storage areas Indicate this figure on the diagram
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I Mark the location of switches, receptacles, luminaires, and permanent appliances
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such as ranges, microwave ovens, heat exchangers, and attic fans with standard electrical symbols I Draw in cable runs between wiring devices, indicating approved cables by type designation, wire gauge, insulation type, and branch circuit amperage If conduit is used, size and location should be given I Identify the wattages for luminaires, permanent appliances such as ranges and airconditioning systems, building service equipment such as furnaces and hot water heaters, and the type and size of each electrical box
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ONE-LINE DIAGRAMS
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One of the most important drawing types for the design of a new electrical system or modernizing an existing system is the one-line drawing It uses single lines and standard symbols to show electrical wiring or busbars and component parts of an electric circuit or system of circuits The one-line drawing differs from the wiring diagram in that it does not specify device (receptacle, switch, luminaire, etc) locations or switch locations for controlling those devices The one-line diagram in Fig 1-7 gives an overview of a complete system and how it works For example, a three-phase load requires three wires, and each wire has its own
* National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts
TLFeBOOK
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pole of a control switch and one overcurrent device It is not necessary to repeat this information three times on the diagram; one line shows what happens to all three wires General rules must be followed in preparing one-line diagrams Compliance with these rules helps to ensure a complete, accurate, and easily interpreted diagram
I Indicate relative positions of components in a building or factory For example, dis-
tinguish between those parts of the system that are inside or outside a building This makes the drawing easier to interpret because components are properly located with respect to each other
Figure 1-7
Typical one-line electrical diagram
TLFeBOOK
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I Avoid duplication of lines symbols, figures, and letters A one-line drawing is a pre-
I I I
cise form of technical communication, and every line, symbol, figure, and letter has a definite meaning Unnecessary duplication will make interpretation more difficult Use standard electrical symbols for the more common wiring devices The use of alternative or modified symbols for common wiring devices leads to confusion and detracts from the correct interpretation of symbols for unusual or special components Allow for future expansion, either on the drawing or with explanatory notes Include correct title data Assign titles with care to be sure that they identify each component correctly, eliminating confusion with other components in the system Include all pertinent technical information
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