Figure 2-8.--A lacing shuttle.
Figure 2-7.--Cable tag.
The most common lacing material is waxed cord.
designated except that each cable receives a single-letter
The amount of cord required to single lace a group of
alphabetical designation, beginning with the letter A.
conductors is approximately 2 1/2 times the length of
Where two cables of the same power or lighting
the longest conductor in the group. Twice this amount
circuit are connected in a distribution panel or terminal
is required if the conductors are to be double laced.
box, the circuit classification is not changed. However,
Normally, conductors are laid out straight and
the cable markings have a suffix number (in
parallel to each other before to lacing since this makes
parentheses) indicating the cable section. For example,
conductor lacing and tracing easier. However, some
(4-168-1)4P-A(1) (fig. 2-7) identifies a 450 volt power
installations require the use of twisted wires. One
cable supplied from a distribution panel on the fourth
example of a twisted wire installation is the use of
deck at frame 168 starboard. The letter A indicates that
twisted pairs for the ac filament leads of certain electron
this is the first cable from the panel, and the (1) indicates
tube amplifiers. This reduces the effect of radiation of
that it is the first section of a power main with more than
their magnetic field and helps to prevent annoying hums
one section.
in the amplifier output. When you replace any wiring
The power cables between generators and
harness, duplicate the original layout.
switchboards are labeled according to the generator
A shuttle on which the cord can be wound will keep
designation. When only one generator supplies power
the cord from fouling during the lacing operations. A
to a switchboard, the generator will have the same num-
shuttle similar to the one shown in figure 2-8 may easily
ber as the switchboard plus the letter G. Therefore, you
know that 1SG denotes one ship service generator that
be fashioned from aluminum, brass, fiber, or plastic
scrap. The edges of the material used for the shuttle
supplies power to 1S switchboard. When more than one
should be smoothed to prevent injury to the operator and
generator supplies power to a switchboard, the first gen-
damage to the cord. To fill the shuttle for single lace,
erator (determined by the general rule for numbering
measure the cord, cut it, and wind it on the shuttle.
machinery) will have the letter A immediately following
Double lacing is done like single lacing, except that the
the designation; the second generator that supplies power
will have the letter B following the designation; and so
length of the cord before winding it on the shuttle is
on. Therefore, 1SGA and 1SGB denote two ship service
doubled. Also, start the ends on the shuttle to leave a
generators that supply ship service switchboard 1S.
loop for starting the lace.
Lacing Conductors
Before starting, terminating, and splicing knots,
apply a binder such as GLYPTOL to the knots.
Conductors within equipment must be kept in place
to present a neat appearance and to make it easier to trace
Start the single lacing procedure by using a clove
hitch, with an overhand knot tied over the clove hitch
conductors when alterations or repairs are required.
When conductors are properly laced, they support each
(fig. 2-9, view A). Lockstitch lacing is shown in (fig.
2-9, view B). The cable is laced its entire length using
other and form a neat, single cable.
Figure 2-9.--Lacing procedure.
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