三芯电缆有助于将设备和机器连接到电源.
您选择使用的 3 芯电缆的尺寸以及您设计电路的方式也会影响您的项目。
由于应用的差异和项目规格的变化.
此外, 高压应用通常需要高质量的电缆, 被称为钢丝铠装 (西南航空), 及其适用的标准和规范.
所以, 您必须熟悉三芯铠装电缆颜色, 以及每种颜色的导体是做什么用的.
在这篇文章中, 我们将更详细地讨论所有这些问题.
What Is Three-core Cable?
It is important to know the type of wire or cable you will use.
No matter what electrical application you plan to work in.
A very popular choice for various purposes is the 3-core cable.
These cables contain three separate cores for three different purposes of transmitting electricity.
例如, if you choose to use a 1.5mm 3-core flex cable, there will be three separate wires inside the main cable jacket.
One of the wires is for powering, the other is for neutral wires, and the third wire in a 3-core cable is for ground (or ground) applications.
It may be helpful to review the above information from the perspective of other types of wires.
Unlike 3-core cables, 2-core cables have one less conductor. Its assembly consists of only two cores.
所以, while a 10mm 3-core armored cable has a live, neutral, and ground (or ground) wire, the corresponding 2-core version of the same cable has no ground conductor. It only has live and neutral conductors.
What Is the Three-core Ground Wire Used for?
They are typically used in applications such as 2-way lighting for residential use, as well as in other applications. Such as central heating systems and wiring of equipment.
Depending on how the electrician designs the circuit for the 2-way lighting.
The 3-core and ground cables may have neutral or live applications.
Generally, a three-core cable refers to a wire with three separate copper cores, each within its own protective jacket.
然而, for the 3-core ground wire, a fourth conductor is inserted during the manufacturing process.
例如, a typical 3-core flex cable will have the usual 3-cores, including live, neutral, and ground, but will also have another conductor—a fourth.
This extra core is usually bare copper for grounding purposes.
In the above example , if we were using a 3-core flex cable with an extra bare copper conductor, the fourth conductor would have to be inserted into the green/yellow coded sleeve (ground) during installation.
Three-core Armored Cable for Electrical Applications
Core armored cable is also commonly known as three-core steel wire armored (西南航空) cable.
例如, you might see a specification that says armoured cable 16mm 3 cores, BS546/BS6724.
This means that the cable meets the requirements of those specific UK cable manufacturing and testing standards.
Three core armored cables are known as power and auxiliary control cables.
Also known as 3-core power cables, these cables are wear-resistant cables and are used in applications where the cable may be damaged or where there is a danger of UV exposure.
The usual 3-core steel wire armoured cable (西南航空) is ideal for external electrical applications.
Since such applications often have to withstand the forces of nature, SWA Outdoor 3-core cables have an additional outer sheath (usually wire mesh)
It provides greater mechanical protection to the inner core of such 3-core cables.
What 我s the Three-core Cable Used for?
As mentioned earlier, a three-conductor cable is a cable that contains three conductors during the cable manufacturing process.
Each type of cable serves a different purpose, and we do not recommend for specific-purpose applications.
例如, if your ideal is a 1mm 3-core cable, it may not be the best practice to switch and use a thicker or thinner cable.
通常, 3-core cable is usually the cable of choice for Class I connections to equipment.
This is because such devices (or related applications) need to provide a connection to Earth.
Two-core Cables vs Three-core Cables
Using 2-core wire instead of 3-core cable in these applications may affect the installation. Failure to ground may expose the user to electric shock.
Electricians can use the 2-core version of the cable instead of the 3-core cable in cases where grounding is not required.
例如, in an application involving a Class II equipment item, an engineer or electrician might use a 2-conductor braided cable instead of a 3-core braided cable.
The reason for this usage is because Class II equipment generally does not require a ground connection.
To sum up, the cables often depend on whether the equipment or appliance needs to be grounded.
According to the electrical code, the enclosure of a Class I appliance must be grounded.
For this, use a 3-core power cord. On the other hand, using a 2-conductor cable is safe for Class II applications.
In applications where there is a greater risk of electric shock if the live wire contacts the body of the equipment or appliance, a 3-core grounded cable is recommended.
例如, if the body is made of a non-conductive material, such as rubber, plastic, glass, or ceramic, it may not be necessary to use a 3-core cable.
然而, it may be safe to choose an outdoor 3-core cable over an externally conductive 2-conductor wire such as metal, steel, iron, or copper.
You can use 2-conductor cable for non-conductive applications, but you must use 3-core cable for bulb sockets, lamp posts, and any other use cases where there is a high risk of electric shock.
通常, 3-core steel wire armoured cables (西南航空) are used to transmit power underground, from a power generation source to a residential or commercial location.
You can also see other armored products, such as 3-core 4mm armored cables, used with catenary wires in overhead power transmission applications.
Often, common electrical applications, such as power cords for lighting switches or appliances, can use flexible wires such as 3-core flex cables.
This is because their use enables cables to bend and twist without risk of breaking or splitting.
The Colors of 3-core Cables
Both 2-conductor and 3-core cables have specific color requirements.
In March 2004, British Standard BS 7671 dealing with electrical installations made some changes to 2- and 3-core colours in the UK.
Changes to these standards took effect on April 1, 2004.
例如, before April 1st, you would see cable manufacturers selling 25mm 3-core armored cables in different colors, but after the new standard goes into effect, it’s illegal (since April 1, 2006) to sell or Use cables with older color schemes.
Until March 2004, the color standard of 3-core ground wire was blue, yellow, red, with ground wire.
然而, after March 2004, the new 3-core cable colors are gray, black and brown as well as earth colors.
These color standards don’t go into effect overnight – there is a 2-year overlap (grace period) before the transition.
During this time, retailers sold 2- and 3-core armored cables, as well as other types of three-conductor products, both old and new coloring systems.
Why Did This Coloring Standard Change?
It is changed mainly to keep the cable colors in line with the rest countries of the EU.
Uniform colour codes are now in effect in all European countries as well as in the UK.
Under the new system, if your application requires a product such as 3-core flat cable, it will only sell the colour codes for the entire continent in the new system.
