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A
ABS
(Antilock Braking System)
Computer, sensors and solenoid switches which together monitor
wheel speed and modulate braking force if wheel lockup is
sensed during braking. Helps the driver retain control of
the vehicle during heavy braking on slippery roads. Cole Hersee
manufactures an ABS Module and green plug and sockets.More
info:D-582
ACTUATOR
The part of a switch which when moved causes the switch to
operate.
This word, although cumbersome, is useful because it includes
all the mechanisms for turning a switch on:
button or pushbutton
rocker
toggle or paddle
pull (as in push-pull)
lever
key (as in an ignition switch)
Cole Hersee switches come with different actuator options.
For example, you can select an ignition key with a lever,
a tumbler lock or a Hencol lock.
Cole Hersee switches.
Always lots of choices.
AIR RIDE
Truck suspension which supports the load on air-filled rubber
bags rather than steel springs. Compressed air is supplied
by the same engine-driven air compressor and reservoir tanks
which provide air to the air brake system.
AFV
(Alternative Fueled Vehicle)
Vehicle powered by a fuel other than gasoline or diesel.The
EPA and other leaders such as the State of California are
mandating that fleets change over (at least in part) to AFV.
compressed
natural gas (CNG)
liquefied natural gas (LNG)
ethanol
methanol
electricity
biodiesel
propane (LPG)
solar
fuel cells
Comparison of BTU/gal
(approx)
128,000 Biodiesel
135,000 Diesel
115,400 Gasoline
84,000 Propane
82,000 Ethanol E85
73,000 LNG
65,000 Methanol M85
22,000 CNG
ALTERNATING CURRENT
A flow of electrical current that increases to a maximum in
one direction, decreases then reverses direction and reaches
maximum in the other direction. This cycle is repeated continuously,
many times per second. The number of such cycles per second
is the frequency, measured in Hertz. US domestic current is
60Hz (i.e. 60 cycles per second). Cole Hersee components are
designed for DC, but many can be used with AC.
In addition to the meaning of 'alternating current', AC
stands for one of the most famous trucks of all time, the
Mack Truck AC Model. Designed in 1915 as the heavy-duty version
of the Model AB, the AC introduced the famous snub nose. The
AC was hard-tired and chain-driven and produced continuously
until 1939.
40,299 trucks were manufactured.
5000 were shipped to Europe for action with British
and US troops in WWI. Becoming synonymous with toughness and
dependability and because of its snub nose, the British 'Tommies'
gave it the name 'bulldog'. The company in 1922 adopted the
bulldog as its trademark, and the famous hood ornament began
to appear on all Mack trucks.
Cole Hersee proudly
provides switches and components to today's Mack Trucks.
AMPACITY
Current-carrying
capacity when expressed in amperes (A).
AMMETER
Electrical test instrument used to measure current in a circuit.
Multimeters are combined ammeters, voltmeters
and ohmmeters (reading current, voltage, resistance.)
AMPERE A
The international unit of measurement for electrical current.
Abbreviated to A, or amps. It is the rate of flow of electrons
in a conductor. When electrons having a total charge of 1
coulomb pass a given point in one second, the current is equal
to 1A. It is the passing at a point of 6,240,000,000,000,000,000
electrons in one second.
See Ohm's Law.
It is named after the
French physicist Andre Ampere (1775-1836).More
on Ampere.
See Ohm's Law for calculations.
APPARENT POWER
The product of voltage and current in a circuit.
ARC
Sparking that results when current flows through the air between
two points of greatly differing potential. This can happen
in overloaded switches.
Cole Hersee switches are built to handle making and breaking
of a circuit without significant arcing, but it's important
to match the load with the rating of any switch.
For high loads, select
a Cole Hersee switch with silver contacts.
ARCING
(Pronounced 'ark-ing')
The undesirable flow of electricity through the airgap during
make or break of electromechanical switches. This can be minimized
by the use of highly-conductive contact sufaces. Accordingly
many Cole Hersee switch contacts are plated with silver.
ARTIC
British usage for 'articulated vehicle' or tractor-trailer.
AWG
American Wire Gauge. This is the US standard for wire size.
| AWG |
Inches |
mm |
| 40 |
0.0031 |
0.079 |
| 39 |
0.0035 |
0.089 |
| 38 |
0.004 |
0.102 |
| 37 |
0.0045 |
0.114 |
| 36 |
0.005 |
0.127 |
| 35 |
0.0056 |
0.142 |
| 34 |
0.0063 |
0.16 |
| 33 |
0.0071 |
0.18 |
| 32 |
0.008 |
0.203 |
| 31 |
0.0089 |
0.226 |
| 30 |
0.01 |
0.254 |
| 29 |
0.0113 |
0.287 |
| 28 |
0.0126 |
0.32 |
| 27 |
0.0142 |
0.361 |
| 26 |
0.0159 |
0.404 |
| 25 |
0.0179 |
0.455 |
| 24 |
0.0201 |
0.511 |
| 23 |
0.0226 |
0.574 |
| 22 |
0.0253 |
0.643 |
| 21 |
0.0285 |
0.724 |
| 20 |
0.032 |
0.813 |
| 19 |
0.0359 |
0.912 |
| 18 |
0.0403 |
1.02 |
| 17 |
0.0453 |
1.15 |
| 16 |
0.0508 |
1.29 |
| 15 |
0.0571 |
1.45 |
| 14 |
0.0641 |
1.63 |
| 13 |
0.072 |
1.83 |
| 12 |
0.0808 |
2.05 |
| 11 |
0.0907 |
2.3 |
| 10 |
0.1019 |
2.6 |
Measurements refer
to diameter
AUTOTRANSFORMER
A transformer used to step voltage up or down. The primary
and secondary windings share common turns, and it provides
no isolation.
AXLE
Structural component to which wheels, brakes and suspension
are attached.
Drive
axles are those with powered
wheels.
Front axle is usually called the steer axle.
Pusher axles are unpowered and go ahead of
drive axles.
Rear axles may be drive, tag
or pusher types.
Tag axles are unpowered and go behind drive
axle. If it is a lift axle, it may be called a stinger.
Lift axles. Weight requirements vary from state to
state, and what is legal in one state may not be legal elsewhere.
Regulations are usually called "B-formula laws".
When vehicles are loaded, they may need to utilize another
wheel pair in order to spread the pressure on the road, especially
for crossing bridges. Lift axles can be retracted. There are
problems with lift axle wheels, especially in turning, where
road surfaces may actually be damaged on a tight turn.
Cole Hersee switches.
Always lots of choices.
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