- According to IEC 60502-1 and GB Standard
- Flame Retardant & LSZH Cable & PVC Cable
- Approved by GB, IEC, RoHs, SGS, BV
- Large stock with different sizes
- Rated voltage 35KV
Electrical Cable Size
Electrical Cables can be classified as low voltage cable, medium voltage cable, and high voltage cable. The raw materials for power cables are copper conductors and aluminium conductors. The armoured methods are steel tape armoured cable and steel wire armoured cable. We have large types of power cables in stock.
Understanding your choice of electrical cable options
Your choice of electrical cable may determine the success or failure of your electrical project. There are electrical applications that require specific types of wires. And then, there are applications where only specific types of cables, such as a 6mm electrical cable, will do. Substituting that cable specification for another, such as 2.5mm electrical cable, may destabilize the project.
In this post, we’ll explain the differences between wires and cables, and we’ll also discuss various types of cables and their uses. Hopefully, this information will lead you to make informed decisions about sourcing the right cables and wires.
1.What is an electrical cable?
When it comes to discussions around electrical projects, you may see the term “cable” and “wire” used interchangeably. In terms of making general observations and discussing generic application, especially by lay-people (those not involved in the electrical field), there’s no harm in referring to an electrical cable in this way. However, in a strictly technical sense, the two terms have starkly different meanings.
A wire consists of a single conductor, commonly made from either aluminum or copper. They (wires) come in two main forms. Solid wires comprise of a single conductor, and may either have a protective sheathe (colored); or the conductor may be bare (unshielded). Stranded wire is yet another type of electrical wire which typically holds several twisted strands of conductors inside a single sheathe。
When there is a requirement for higher-frequency applications with lower resistance, electricians choose solid wires. Stranded wires, on the other hand, make an ideal choice in applications requiring electrical cable wire with more flexibility. For some electrical applications though, wires may not be the appropriate choice. In such cases, electricians and engineers may find electrical cable the more useful choice.
So, what is a cable? Well, a cable is essentially an “extension” to a wire. It typically comprises of two or more insulated wires wrapped inside a single jacket. It is important to note that multiple conductors without insulation typically identify as a single conductor inside a cable.
So, as you can see, non-technicians may use the term wire and cable interchangeably, but the two words have different meanings to professional electricians. If you aren’t sure whether your application calls for a wire or a cable, make sure you consult a professional electrician first, before ordering or using a product.
2.What are the different types of electrical cables?
The type of electrical cable is measured by the intended (or recommended) application. The measure of that application is the volts of power transmitted via the cable. Based on that measurement, these cables are grouped according to the following types:
a)Low voltage cables – transporting up to 750 V: Typically, the coatings on these cables include thermoset and thermoplastic materials. They may be found in many residential and commercial applications
b)Low Voltage cables – carrying up to 1,000 V: This type of power cable also goes by an alternate name – 0,6/1 kV cable – and is used in many industrial applications, including infrastructure and industrial projects
c)Medium Voltage cables – for power range between 1kV to 36 kV: Typically, you’ll find this cable used in power distribution applications, including to transport power from an electrical sun-station to a transformer
d)High Voltage cables – for transmissions of power from 36 kV and above Because these cables handle extreme amounts of power, electrical engineers typically use a high voltage cable to transport bulk power from power generating plants to smaller local electrical sub-stations
Cables may sometimes also be distinguished by their construction. The types of electrical cable, based on their physical characteristics include:
a)Twisted pair cable – comprising of two cables twisted together to form a single cable
b)Multi-conductor cable – which have two or more insulated conductors running inside them
c)Coaxial cable – that has an inner conductor and a parallel external foil conductor that’s protected by layers of insulation
d)Fiber optic cable – this type of cable is made from multiple strands of glass fiber (or strands) and offers greater bandwidth than corresponding metallic conductors
Cables may also be identified in terms of their dimensions. For example, a 2.5mm electrical cable may be ideal for an application requiring cabling of a certain dimension. However, that size of cable may not be appropriate for another application, for which a 6mm electrical cable may be the right choice.
3.What are the different uses of various types of electrical cables?
Each type of cable, whether it is for residential or commercial application, has a specific use. Here are some of the most common uses of various electrical cable types:
a)Flexible cables are used to wire electrical panels and cabinets
b)Power cables are common for power transmission, and may be either low or high voltage cable
c)Armored cables are used in applications where there’s a risk of aggression or interference to the cable
d)Rubber cables are best used in applications requiring flexibility, such as stringing cables over uneven surfaces or around steep bends and turns
e)Halogen-free cables are useful in applications requiring low smoke and corrosive gas emissions in the event of a fire
f)Where there’s a need for electricity transmission in extreme conditions, fire-resistant electrical cables are used
g)Solar cables are best used when connecting photovoltaic (PV) panels
The use of specific cables, such as 2.5mm electrical cable or a 6mm electrical cable will also be determined by the type of application, the load requirement and the overall environment of the power project.
4.How deep is electrical cable buried?
When undertaking an electrification project, it may be tempting to run an outdoor electrical cable, from point A to point B above ground, for the shortest route. That may be an acceptable solution to some applications.
However, if there’s a possibility of constant interruptions between the two points, such as mowing the lawn between the home and the shed where the cable runs, then the safest thing to do is to use underground electrical cable and burry it away from interference or interruptions.
The depth to which a cable must be buried is typically governed by state and local laws and regulations. The types of electric cable used in the project may also determine burial depth. Here are some recommended depths for burying cables:
a)Underground Feeder (UF) cables with a conduit must be buried 18 inches or deeper
b)If burring UF cables without conduit (direct-buried), that depth must be a minimum of 24 inches
c)Cables and wires shielded inside an intermediate metal conduit (IMC) or rigid metal conduit (RMC) may be buried with a minimum of 6-inches of earth cover
d)Burry wires and cables inside PVC conduits to a depth of at least 18 inches of earth cover
e)Electrical wire that carries no more than 30 V (low-voltage) may be buried at a minimum depth of 6-inches
f)For applications using a high voltage cable in an environment like a swimming pool, hot tub or spa, the cable must be at least 22.5 feet above water-level. For telephone, internet and other data transmission applications, in water-based environments (pools, spas etc.), the cables must be at least 10 feet above water-level
The above are broad guidelines to determine how deep an electrical cable may typically be buried. Of significant note is the fact that the burial depths stated above refer to earth cover – not the absolute depth of the trench or channel you will dig for the burial. To determine trench depth, add the dimension of the underground electrical cable used. Also, remember to always check local electrical codes, as well as consult a professional, licensed electrician before starting to dig.
5.How to find underground electrical cable?
If you are undertaking an electrical project involving an application requiring locating an underground electrical cable first, before proceeding with the project, it might be a challenge. Although most residential and commercial property owners are required to maintain detailed records of their electrical cabling, that’s often not the case.
It is therefore left to anyone doing a project at that premises to first locate the buried outdoor electrical cable and then plan their next moves.
Depending on the type of power cable buried underground, there are two types of approaches used to trace their location:
a)Active locating: This approach involves pushing a power charge to the target cable, and then employing a receiving device to pick up the signal that’s generated.
b)Passive locating: If the target cable already has electricity flowing through it, for instance a high voltage cable transmitting power from a grid and buried underneath your lawn, then passive locating technique may be a good way to detect the cable’s location.
The advantage of this method for finding buried electrical cables is that it doesn’t require you to charge the cable – because it already is powered (by the current delivered from the main source – e.g. the power grid). However, if power is interrupted or cut-off during the detection process, this approach won’t work.
In some cases, the cable might be just six to eight inches deep. In other instances, there may be several feet of earth covering hiding the cable. So, how do you find a cable that’s buried underground electrical cables? Well, here are some ways to locate them:
a)Hum Devices: These devices, like radio receivers, detect magnetic radiations emanating from live electricity travelling inside a cable. For the device to work, power must be flowing through the cable
b)Radio Frequency Detectors: These RF devices pick up low-frequency radio signals emitted from metal pipes and underground electrical cable
c)Transmitter-Receivers: These types of devices are great to detect the start and end points of buried cables. A transmitter induces a signal at the starting point, and a receiver picks up the signal at the terminating end. However, this device won’t pin-point the exact route of buried wire and cable – to do that, you’ll need to carefully excavate between the transmitting and receiving points
d)Metal Detectors: These detectors are very handy at picking up signals of flat objects that are buried at reasonable depths. However, they may miss signals emitted from round cables
6.Sourcing the Right Electrical Cables and Wires
So, with so much depending on making the right choices, how do you ensure that you have the right electrical cable or wire for your project? Well, it’s one thing to do your diligence when buying a product – but you really don’t know much about the manufacturing of that electrical wire, or what raw materials go into the final product.
The wire and cable manufacturer typically makes those decisions. And that’s why, in order to source the best materials for your own electrification project, you must work with a cable manufacturer of repute.
With years of experience in the electric cable and wire manufacturing industry, ZW Cable has the know-how and expertise to produce high-quality products at extremely reasonable costs. This not only guarantees your project completion to the highest safety standards, but the indoor or outdoor electrical cable you purchase will save you a lot of money. The result: A high-quality, low-cost and on-time electrical project!