In my last post I talked about, what is cable insulation and various type of insulation? Today I will discuss about the cable classification and specification of electrical cable. So let’s go.
First of all I want to tell you why you need to know about the electrical cable classification and specification? OK, let’s consider you are an electrical engineer or a technician and its means you are on work. When you are handling that kind of responsibility then you may need to install new machine and provide the power from your distribution board (DB BOX) to the machine inside your factory.
Of course all new machines always come with its specific voltage rating and current consumption rate. Now you have to calculate the machine required power and the distance from your DB Box. You may ask why you need to calculate distance. Because no matter what type of cable you select, it will have a certain amount of voltage drop for each 100ft. After all calculation you will select the best type of cable for your new machine.
It does not matter what type of voltage you are using. It can be single phase 220V to three phases 440V, 11KV or more.
Classification of Electrical Cable:
- Low Voltage or L.T Cable upto 1000V
- High Voltage or H.T Cable (above 1000V to 11KV)
- Super Tension or S.T Cable (above 11KV to 33KV)
- Extra High Voltage or E.H.T Cable (above 33KV to 66KV)
- Extra Super Voltage or E.S.T Cable (above 66KV)
Specification of Electrical Cable:
N = VDE German Electrical Engineers.
Y = PVC Insulated.
F = Galvanized Steel Flat Wire Armoring.
Gb = Galvanized Steel Tape.
Y- PVC Sheath (Outer Sheath)
re = Conductor of Single Solid Wire Having Circular Cross Section.
rm = Conductor of Multiple Stranded Wires Having Circular Cross Section.
sm = Conductor of Multiple Stranded Wires Having Sector Shape Cross Section.
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