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Figure 2-9.—Detail B indicated in figure 2-8. | Up
Construction Electrician Basic - Electricity handbook for electricians | Next
Figure 2-12.—Elevations. |
This building is shown in figure 2-10, view A, and you
areequippedwithahugesaw. Ifyousawedthe building
in half horizontally and looked down on it from above,
you would see the complete outline of the building
(view B). This particular view directly above would be
called a floor plan (view C). Architects and engineers
project their thoughts of a building, not yet built, onto a
piece of paper and call it a floor plan. It does not matter
that the heights of the outlets, appliances, or building
parts are different. These heights will be indicated by
figures in inches or feet, next to the symbols that
represent them. Electrical construction drawings are
floor plans modified by the inclusion of electrical
symbols.
Figure 2-11 shows an electrical layout
superimposed on an outline taken from an architectural
floor plan The service line that brings power into the
house is a three-wire line in 1 1/4-inch conduit. The
service line feeds power by way of a service switch to a
lighting panel, from which three branch circuits run to
the lighting fixtures and convenience outlets in the
rooms. The symbols for these fixtures and outlets
and the service switch are shown at the bottom of figure
2-11.
Elevations
An elevation is a drawing that represents a view of
the finished structure as you would see it from the front,
back, left, or right. There are interior elevations, such as
a view of a fireplace, as well as exterior elevations, as
shown in the elevations of a small building shown in
figure 2-12.
Doors, windows, shapes of roof, chimneys, and
exterior materials are shown. These views provide the
viewer with a finished appearance.
Few dimensions are given on elevations. Only
those vertical dimensions that cannot be shown on the
plan are generally included on an elevation view. A
Construction Electrician can quickly see from any one
of the elevations in figure 2-12 that there is an attic
where easy access would be provided to electrical
wiring. This is important where there is a requirement
for junction boxes that must be accessible. The
electrician can also see a foundation wall where, if a
service lateral is required, a conduit or sleeve must be
placed (for a later run of conduit). This knowledge
will allow the electrician to plan ahead to work with the
Figure 2-10.—Floor plan development.
2-22
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