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Chapter 2 Drawings and Specifications | Up
Construction Electrician Basic - Electricity handbook for electricians | Next
Legend or Symbols |
Figure 2-1.—Title block.
Revision Block
The revision block is usually located in the upper
right-hand comer of the blueprint and is used for
recording of changes (revisions) to the print. All
revisions are noted in this block and are dated and
identified by a letter and a brief description of the
revision (fig. 2-2).
Scale
The graphic representation of the project is drawn
to some proportion of the actual size of the project.
One-eighth inch on such a drawing is equal to a foot of
the actual size of the project. Although the original
drawing is scaled accurately, your drawing will be a
copy of that original and will not likely be the same size
as the original drawing.
The copy may have been
reduced slightly. The paper size is also affected by
temperature and humidity. The paper may stretch or
shrink. Because of these factors, do not rely on
measurements taken by laying a rule on the drawing.
For example, do not assume that a number of units (as
1/8-inch increments) on the drawing is equal to that
same number of feet on the project. This may or may
Figure 2-2.—Revision block.
2-2
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