DRAWINGS AND SPECIFICATIONS
Working with drawings and specifications (specs)
is an essential part in your development as a
Construction Electrician. You must be able to
interpret, plan, estimate, and schedule construction
projects, using the information supplied by the
drawings and specifications. You will need to picture
the separate operations mentally as the work
progresses through the various stages of construction.
You must use good judgment when determining what
effect numerous factors and conditions have on a
project and what allowances should be made for each
of them. You must have ready access to information
about the material, the equipment, and the labor
required to perform various types of work under
conditions encountered as part of the Naval
Construction Force (NCF). In this chapter, we discuss
this important phase of your work, that is, working
with drawings and specifications.
Project concepts are developed by local activities.
Their supporting documentation for a construction
project is forwarded to NAVFACENGCOM,
Engineering Field Division (EFD), for requirement
validation, technical adequacy of the design solution,
and reasonable cost estimate. Once a project has been
designed, approved, and funded, it then must be
accepted by COMSECOND/COMTHIRDNCB for
tasking to the Seabee community. Your first
encounter with a project that may have taken years
to develop and fund will be the drawings and
From the beginning (a facility deficiency) to the
end (a deficiency corrected), an involved process takes
place. As a member of the NCF, you are the person who
makes the needs and ideas of the naval community
come to reality.
To be able to work with, and from, drawings and
specifications, you must know the terms commonly
associated with planning, estimating, and scheduling.
We have defined a few of the terms you will need to do
your job. Read them with care, but do not try to
memorize them. Remember where you found them so
you can refer to these terms whenever you have to use
Activity estimates consist of a listing of all the
steps required to construct a given project. Activity
quantities provide the basis for preparing the material,
equipment, and manpower estimates. They are used to
provide the basis for scheduling, material deliveries,
equipment, and manpower.
Bill of material (BM) is a tabulated statement of
the material required for a given project. It contains
such information as stock numbers, unit of issue,
quantity, line-item number, description, vendor, and
cost. Sometimes the bill of material will be submitted
on either material estimate sheets or material takeoff
sheets; the two sheets contain similar information.
Usually, the takeoff sheet is an actual tally and
checkoff of the items shown, noted, or specified on the
construction drawings and specifications.
Construction activities are a breakdown of
master activities. They identify functional parts of the
project and are often assigned to a particular company
(Bravo/Charlie) or rating.
Detailed estimates are precise statements of
quantities of material, equipment, and manpower
required to construct a given project. Underestimating
quantities can cause serious delays in construction or
can result in unfinished projects. A detailed estimate
must be accurate to the smallest detail to quantify
Direct labor includes all the labor expended
directly on assigned construction tasks, either in the
field or in the shop, that contribute directly to the
completion of the end product.
Equipment estimates consist of a listing of the
various types of equipment, the amount of time, and
the number of pieces required to construct a given
Estimating is the process of determining the
amount and type of work to be performed and the
quantities of material, equipment, and labor required.