OPNAVINSTInstructions from the Chief of Naval
OSHAOccupational Safety and Health Act.
P&EPlanning and estimating.
PHOTOCELLA light-controlled variable resistor
that has a light-to-dark resistance ratio of 1:1,000;
used in various types of control and timing
PICTORIAL WIRING DIAGRAMA diagram
showing actual pictorial sketches of various parts of
a piece of equipment and the electrical connections
between the parts.
POLYPROPYLENEAny various thermoplastic
resins that are polymers of propylene. They are
tough and hard and are used to make molded
articles and fibers.
mechanical, electrical, and electronic checks that
are made to determine whether or not equipment is
PWCPublic Works Center.
PWDPublic Works Department.
electromagnetic energy into audible form.
RECTIFIERA device that converts alternating
current to direct current.
REGULATORThe section in a basic power supply
that maintains the output of the power supply at a
constant level in spite of large changes in load
current or input line voltage.
RELAYAn electromagnetic device with one or more
sets of contacts that change position by the
magnetic attraction of a coil to an armature.
RESISTANCE The opposition of a device or
material offers to the flow of current. The effect of
resistance is to raise the temperature of the material
or device carrying the current.
ROTORThe revolving part of a rotating electrical
machine. The rotor mat should be either the field or
the armature, depending on the design of the
SAFETY Being safe from undergoing or causing
injury, harm, or loss of personnel or equipment.
SCALEThe ratio between the measurement used on
a drawing and the measurement of the object it
graphic symbols to show now a circuit functions
SHORT CIRCUITAn unintentional current path
between two components in a current or between
component and ground; usually caused by a circuit
malfunction (also known as direct short).
SINGLE-LINE DIAGRAMA diagram using single
lines and graphic symbols to simplify a complex
circuit or system.
SLIP RINGSContacts that are mounted on the shaft
of a motor or generator to which the rotor windings
are connected and against which the brushes ride.
Devices for making electrical connections between
stationary and rotating contacts.
SOLID-STATE DEVICEAn electronic device that
operates by the movement of electrons within a
solid piece of semiconductor material.
identification relating to quality, strength, or similar
STATORThe stationary part of a rotating electrical
machine. The stator may be either the field or the
armature, depending on the design of the machine.
SYNTHETIC-FIBER LINEA rope made from
either nylon, polyester, polyethylene, or
TITLE BLOCKA blocked area in the lower right
corner of a print; provides information to identify
the drawing, its subject matter, origins, scale, and
TOATable of Allowance. Personnel, equipment, and
supplies needed for a particular NCF unit for that
unit to function properly.
TRANSFORMER A device composed of two or
more coils, linked by magnetic lines of force; used
to transfer energy from one circuit to another.
TROUBLESHOOTING The process of locating
and diagnosing faults in equipment by means of
systematic checking or analysis.
UTILITY PLANA floor plan of a structure showing
locations of heating, electrical, plumbing, and other
service system components.