16.05.Installation of Wires and
Cables. Installation of wire in conduit is made
with the use of pull lines or fish tapes and an
approved wire-pulling lubricant. Suitable
equipment should be provided to prevent
cutting or abrasion of conductor insulation
during the pulling of the wires. Lubricating
compound must not have a harmful effect on
the conductor insulating materials. All wires in
a conduit are bundled and pulled at one time.
Pulling lines are attached by direct connection
to the conductors or by the use of a cable grip.
Slack is provided at attachment of devices or
splicing. In outlet boxes, for future installation
of wiring devices, the ends of wires are
insulated with tape or a suitable wire connector.
All conductors of each circuit in a junction box
containing multiple circuits must be
permanently identified with suitable labels.
Nonmetallic-sheathed cable may be
installed exposed on walls and ceilings in
protected areas or concealed in hollow walls,
under floors, or above ceilings. Provisions for
outlets and switches are made by running the
cable into outlet boxes. All splices are enclosed
in outlet or junction boxes; this requirement
applies to both exposed and concealed
The moment your battalion or unit receives orders
to undertake a major construction project, watch for the
arrival of sets of drawings and specifications, which are
usually provided well in advance of the deployment
period. These drawings and specifications will also be
the basis for the P&E and scheduling. Take a look at the
specifications. After you advance in rate, especially if
you are concerned with P&E, it will be your
responsibility to study the applicable specifications
NAVFACENGCOM has prepared specifications
that cover practically every subject on naval
construction. These specifications are the standards
followed by the NCFabove all other specifications
that may be available.
DRAWINGS AND SKETCHES
As a Construction Electrician you will be required
to read and interpret drawings and specifications,
sketches, and electrical diagrams. Before you can work
with drawings effectively, you must know how to
interpret electrical symbols correctly. Knowing how to
draw and interpret freehand sketches is also important.
You will see how the different parts of a drawing relate
to the overall plan the drawing represents. You will also
learn to recognize the different types of drawings and
One of the most important symbols to use right at
the beginning of a new job is the directional symbol.
This symbol, which is usually an arrow labeled "N" for
north, enables the reader of a construction drawing to
orient it. A drawing is properly oriented when it is held
so that the north arrow shown on the drawing is pointing
toward north. Construction Electricians sometimes
find themselves standing in open ground with only a
drawing and an area staked off by the Engineering Aid
who tells them where to start shoveling for an
underground conduit run. The drawing must be
properly oriented so the reader can relate the
information on it to the surrounding area.
Understanding common standard symbols, such as the
north arrow mentioned above, is a must for some one
who expects to do well inelectrical construction work.
Some of the most common symbols you will see in
building construction work are listed in figure 2-5.
These symbols were selected from ANSI Y32.91972.
Study these symbols carefully. A good way to
memorize them is to copy each symbol several times
while thinking of the electrical component or device it
represents. Learn to relate each symbol mentally to the
component it represents whenever you see the
component. For example, as you pull the wire through a
conduit in a floor slab, you might try to recall the symbol
mentally for "wiring concealed in floor." When you
walk into the company office and see a duplex
receptacle outlet, you should think about its symbol.
This practice will enable you to associate symbols to
actual electrical devices. This type of training will help
you become a better CE.
Although figure 2-5 shows some of the most
common standard symbols, these are by no means the
only ones you will see in your work. Sometimes a
symbol for a particular component or device may have
been created by the architect or engineer who developed
the drawing. For various reasons, some of the symbols
on a drawing may not be standard. Many times you will
figure out what a symbol means by analyzing it and
thinking about what it looks like. The legend on a
drawing should show any nonstandard symbols and