military. A bill of material for an electrical plan is
shown in figure 2-4.
Even well-drawn construction drawings cannot
adequately reveal all the aspects of a construction
project. There are many features that cannot be shown
graphically. For instance, how can anybody show on a
drawing the quality of workmanship required for the
installation of electrical equipment or who is
responsible for supplying the materials, except by
extensive hand-lettered notes. The standard procedure
then is to supplement construction drawings with
These detailed written
instructions, commonly called specifications (specs),
define and limit the materials and fabrication according
to the intent of the engineer or the designer.
specifications are an important part of the project
because they eliminate possible misinterpretation and
ensure positive control of the construction.
There are many different types of specifications. A
few of those common to the Naval Construction Force
(NCF) will be discussed here.
NAVFACENGCOM specifications are prepared
by the Naval Facilities Engineering Command, which
sets forth the standards of construction for the NCF and
all work performed under the jurisdiction of the Naval
Facilities Engineering Command.
Several types of specifications influence the
preparation of NCF project specifications. These
include NAVFACENGCOM guide specifications and
type specifications; commercial specifications and
standards; technical society and association standards,
such as American National Standards Institute (ANSI)
and Underwriters Laboratories (UL); and
Figure 2-4.Bill of material.