UL20789 is a 105degC, 30 Volts cable.
The minimum conductor is 40AWG.
As UL20789 is able to use smaller gauge conductors as small as 40awg, it may use for the below application:-
DVD, CD-ROM, P-PDVD, LCD, LCD TV, Digital Camera, Laptop, Equipment, Printer, Scanner, Learning Machine and etc..
The below specification is currently Pan-International provided for Car Audio.
Universal Serial Bus (USB) 2.0 is an external interface used on computers and other digital devices to transfer data through a cable. The designation “2.0” refers to the standard or version of the interface and it was released in 2000. While USB 3.0 was made standard in 2008, it is backward compatible with older versions. The primary difference between each version has been a major increase in transfer rates, with USB 2.0 improving upon the original release and 3.0 being even faster.
Major Features
USB is a plug-and-play interface, which means that a computer does not need to be powered off in order to plug in or unplug a component. For example, a media player can be connected to a computer via a USB while the machine is still in use, making these devices "hot swappable." The computer registers the device as another storage area and shows any files it contains. Other types of ports often require that someone shut down a computer before making such a connection, which led to much of the format's popularity.
The maximum approved length for a USB 2.0 cable is about 16 feet (5 meters). This limitation is based on how quickly a signal travels through the cable. If it takes too long, then the connected devices indicate that it was lost, and anything over about 16 feet (5 meters) exceeds this time.
Upgrade From 1.0
When USB standards change from an
existing version to a newer version, as they did from 1.1 to USB 2.0, the major
improvement is often the speed at which data transfers between connected
devices. In 1.0 and 1.1, there were two speeds available: "low speed"
with a rate of 1.5 megabits per second (Mbit/s) and "full speed" at
12 Mbit/s. USB 2.0 improved upon these with "hi-speed" transfer rates
of 480 Mbit/s. Since this standard is typically backward compatible, the 2.0
version includes the older "full speed" and "low speed"
rates to function with 1.0 devices.
Even in USB 2.0, "low
speed" was often used for data transfers between a computer and a mouse or
keyboard, except for high-end gaming devices. Memory sticks and external hard
drives became much more powerful with the 2.0 standards, since they often ran
into "bottlenecks" with older transfer rates. A bottleneck is a point
at which data is slowed down by limitations in transfer rate, such as the
slower speeds of 1.0 ports, even though the devices themselves can send and
receive data much faster.
Common Devices
Aside from media players, many other external devices use these
data ports, including digital cameras, mobile phones, and newer cable boxes.
Native components also make use of this interface, such as mice, keyboards, and
external hard drives, as well as printers and networking hardware. One of the
most popular and convenient USB 2.0 gadgets is a memory stick, which can store data for easy
transfer between machines.
In 2008, USB 3.0 was officially adopted as the new standard for
this format. It introduced new connections that included more pins, allowing
for "SuperSpeed" data transfer rates of up to 5 gigabits per second
(Gbit/s). The 3.0 standard maintained backward compatibility, including "hi-speed"
and "full speed" rates to function with older USB 2.0 devices.
| Speaker wire is used to make the electrical connection between loudspeakers and audio amplifiers. modern Speaker wire consists of two electrical conductors individually insulated by plastic. Certain older designs also featured another pair of wires for a powered line to power an electromagnet in the loudspeaker before permanent magnets became economical to produce and use.The effect of Speaker wire upon the signal it carries has been a much-debated topic in the audiophile and high fidelity worlds. Speaker wire, like any other linear electrical component, has three parameters which determine its performance: resistance, capacitance, and inductance. If a perfect wire were possible, it would have no resistance, no capacitance, and no inductance. The shorter a wire is, the closer it comes to being perfect, as resistance decreases as length decreases in all conductors (except superconductors). Resistance is the property which has the most effect on speaker wire performance, whereas capacitative and inductive characteristics of speaker wire are insignificantly small relative to the loudspeaker itself. Larger conductors (smaller wire gauge) have smaller resistance. As long as speaker wire resistance is kept to less than 5% of the speaker's impedance, the conductor will be adequate for home use. Steranded speaker wire is more flexible than solid wire, and is suitable for movable equipment. Even with poor-quality wire, an audible degradation of sound may not exist. Many supposedly audible differences in speaker wire can be attributed to listener bias or the placebo effect. Below is the Specification commonly use for speaker. UL2468 22AWG 2F Cable. |  |
XLPE - cross-linked polyethylene
XLPE is an abbreviated
designation of “cross-linked polyethylene”. Polyethylene has a linear molecular
structure as shown in A. Molecules of polyethylene not chemically bonded as
shown in B are easily deformed at high temperature, while XLPE molecules
bonded in a three dimensional network as shown in C and D, have strong
resistance to deformation even at high temperature.
Cross linked polyethylene is produced from polyethylene under high pressure
with organic peroxides as additives. The application of heat and pressure is
used to effect the cross linking. This causes the individual molecular chains
to link with one another which in turn causes the material to change from a
thermoplastic to an elastic material.
An important advantage of XLPE as insulation for medium and
high voltage cables is their low dielectric loss. The dielectric loss factor is
about one decimal power lower than that of paper insulated cables and about two
decimal powers lower than that of PVC-insulated cables. Since the dielectric
constant is also more favourable, the mutual capacitance of XLPE cables is also
lower, thus reducing the charging currents and earth-leakage currents in
networks without the rigid star-point earthing.
“XLPE” Insulation
Offers These Advantages:
·
Outstanding
physical and mechanical toughness
·
Extremely low
moisture absorption
·
Excellent ozone
resistance
·
Strong
resistance to chemicals fumes and gases
·
Low SIC and
power factor
·
High impulsed
strength
·
High insulation
resistance and dielectric strength
·
Capability of
carrying and terminating
·
Easy to splicing
and terminating
UL3386 105ºC 600V XLPE
INSULATED WIRE
Halogen Free
· Rated temperature:105ºC·
· Rated voltage: 600v
·
According to:UL subject 758, UL1581, CSA
C22.2
·
Solid or Stranded, Tinned or bare
copper conductor 32~8AWG
·
XLPE insulation
·
Passes UL VW-1 &
CSA FT1 Vertical flame test
·
Uniform insulation
thickness of wire to ensure easy stripping and cutting.
·
RoHS Compliant.
·
UL3386 wire can use
for the Internal wiring of appliances where exposed to oil at a temperature not
exceeding (60°C or 80°C, whichever is applicable).
|
Gauge(AWG) |
Copper (mm) |
Conductor OD (mm) |
insulation thickness (mm) |
wire O.D (mm) |
Max Cond. resistance（Ω/kft ,20ºC） |
|
26 |
7/0.16 |
0.48 |
0.76 |
2.10±0.1 |
45.2 |
|
24 |
11/0.16 |
0.61 |
2.25±0.1 |
29.3 |
|
|
22 |
17/0.16 |
0.76 |
2.35±0.1 |
16.7 |
|
|
20 |
21/0.178 |
0.94 |
2.55±0.1 |
10.5 |
|
|
18 |
16/0.254 |
1.16 |
2.80±0.1 |
6.52 |
|
|
16 |
26/0.254 |
1.49 |
3.10±0.1 |
4.18 |
|
|
14 |
41/0.254 |
1.87 |
3.77±0.1 |
2.62 |
|
|
12 |
65/0.254 |
2.36 |
4.14±0.1 |
1.65 |
|
|
10 |
105/0.254 |
3 |
5.20±0.1 |
1.04 |
|
|
8 |
119/0.3 |
4.25 |
1.14 |
6.90±0.2 |
0.653 |
APPLIANCE WIRING MATERIAL
Subj.758
Section 3
Page 3271
Issued:1972-08-02
Revised:2011-10-04
|
Rating |
125 deg C,
600 Vac, 750 Vdc, Horizontal flame. |
||
|
Conductor |
30 AWG -
1000 kcmil solid, stranded, or braided, tinned, bare or silver-plated |
||
|
Insulation |
Extruded
XLPE. |
||
|
Conductor
size |
Minimum
average thickness |
Minimum
thickness at any point |
|
|
30-9 AWG |
30 mils |
27 mils |
|
|
8-2 AWG |
45 mils |
40 mils |
|
|
1-4/0 AWG |
55 mils |
50 mils |
|
|
213-500
kcmil |
65 mils |
58 mils |
|
|
501-1000
kcmil |
80 mils |
72 mils |
|
|
1001-2000
kcmil |
95 mils |
86 mils |
|
|
Standard |
Appliance
Wiring Material UL 758. |
||
|
Marking |
General. |
||
|
Use |
For use as
Motor Leads or Internal Wiring of appliances. Tags may indicate the
following: 2500 volt peak - For Electronic Use Only. |
||
