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T
TERMINAL
In a switch, the point at which connection is made to the
rest of the circuit. Terminals are either hardwired or plugged
in to the rest of the circuit. Terminals usually project at
the back of a switch, and are usually hidden away when the
switch is mounted.
Cole Hersee makes switches
with many different styles of termination, depending upon
your application. If you are an OEM, we can manufacture switches
with whatevver type of terminal you need. Call us! Also, we
make so many variants that are not listed in the catalog,
that we might have the very kind you need. Call us!
We recommend screw terminals
in vehicle applications, because they provide the most secure
method of connection, but there are many other excellent plug-in
types.
We make switches with
the following types of terminal:
blade
blade for special receptacles, such as Packard
screw
stud
wire leads
bullet and button
combinations of different terminals.
TL
CARRIER, TRUCKLOAD CARRIER
A for-hire carrier whose primary business is point-to-point:
single pickup, single delivery. Unless he has a return load,
such a truck will be empty after delivery.
See LTL Carrier See For-hire
Carrier
TRACTOR
Truck designed to pull a semitrailer by means of a fifth wheel
mounted over the rear axle(s). Sometimes called a truck tractor
or highway tractor to differentiate from it from a farm tractor.
See Conventional. See Weight
Classes. See Cabover
TAP
A
connection point brought out of a transformer winding to permit
changing the turns ratio.
Also the act of adding a wire to another, to create a second
circuit. See Cole Hersee Quik-Tap Cable Splicers D-532
TRANSDUCER
A
device that takes one form of energy and converts it to another:
sound to electrical (microphone), electrical to sound (loudspeaker),
electricity to heat (resistive heater), electricity to light
(lamp), light to electricity/electronic (photoelectric cell)
etc.
TRUCK WIRING
Heavy-duty wiring systems are designed to carry specific amounts
of current, at a voltage of usually no less than 12V and a
maximum of 13.5V. With trailers and combination vehicles there
should be no more than a 0.7V drop per trailer when measured
at the rear trailer lamps.
The wiring should be capable
of providing a minimum of 10V to any incandescent lamp on
a straight truck or a combination. Voltage drop is the primary
consideration in selecting the appropriate wire size. The
length of wire is a major contributing factor contributing
to voltage drop.
Although wiring colors
are not standardized in tractor units, there is a color standard
for trailers:
White
wire: Ground return to the tractor
Black
wire: Clearance, side marker and license plate lamps
Yellow
wire: Left-hand turn signal and hazard signal lamps
Red
wire: Stop lamps and ABS
Green
wire: Right-hand turn signal and hazard signal lamps
Brown
wire: Tail, clearance, side marker lamps, identification lamps
Blue wire:
Auxiliary circuits
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