Choose The Best Medium Cable
The first time I held a medium cable in my hands, I was amazed. The list of capabilities and applications for cables seemed endless. Anyone who has ever worked with cables or has ever seen them work in front of their eyes knows that they are both simple and complicated machines. While most students in schools don’t delve into the complexities of how a cable is actually made, several universities offer classes on how to create the perfect cable. Usually, it’s the school’s engineering department that teaches the class, but several schools think the subject deserves its own division instead. Although there are professionals who focus entirely on cables and related products (and don’t do anything else), it’s hard to find jobs where you only deal with cables because they’re so intertwined with every other form of technology available today.
What is the medium cable?
Medium voltage (MV) is commonly defined as a nominal voltage in the range of 1,000 to 100,000 volts, though in some jurisdictions this definition may extend to over 300,000 volts. The European norm EN 61008 defines medium voltage (MV) as “power systems and equipment for voltages up to and including 36 kV (power transmission lines or substations), or voltages up to and including 50 kV (industrial installations)”. In North America, the NEMA standards define medium voltage as a nominal voltage of 5 kV and above.
The medium voltage distribution is used for power transmission over distances up to 30 km, while low-voltage distribution is used on shorter distances.
Medium cable is used for the transmission of electric energy at voltages of between 3000 V and 36 kV (kilovolts). They can be divided into two main groups according to their cross-section: circular cables made from round conductors stranded with one or more layers of insulation material, and flat cables made from flat conductors with one or more layers of insulation material.
Types of medium voltage cables
Type medium cables are defined as single or multi-conductor cables rated for 2001 volts up to 35,000 volts. Type MV cables are typically specified as either an MV 90 cable or an MV 105 cable, with the 90 or 105 designating the maximum conductor temperature in degrees Celsius (ºC).
The 90 and 105 designations refer to the maximum conductor temperature at which the cable may be used at a current of 90 or 105 amps per square millimeter (amps/mm2) respectively. The maximum allowable ampacity depends on the type of insulation used and whether the cable is underground or overhead. For example, an MV-105 cable may have an ampacity of 100 amps/mm2 when used in a dry location and 70 amps/mm2 when used underground.
MV cables are manufactured in both flexible and nonflexible configurations. Flexible MV cables have a soft polyvinyl chloride (PVC) jacket that allows them to be bent around corners without kinking or causing damage to the insulation. Nonflexible medium voltage cables have no flexibility, making them more difficult to install and use than flexible types. We can also offer types of high voltage cables.
Medium cable specifications and standards
The medium cable is used for the transmission of electrical energy at voltages from 500 to 35000 volts. Medium voltage cables are typically used in industrial applications as well as for private residences.
Medium voltage cables are made of copper or aluminum wires that are surrounded by an insulating material such as polyethylene, polyvinyl chloride (PVC), cross-linked polyethylene (XLPE) or extruded cross-linked polyethylene (XLE). The insulation provides protection from external damage while allowing the transmission of electric current.
The main properties of the IEC 60502-1 specification include a maximum operating temperature of 90°C, minimum breaking strength of 7 kN/km, a minimum bending radius of 19 mm, and a maximum short circuit current rating of 125 A/km. The main properties of the BS 7671-3:2008 specification include a maximum operating temperature of 80°C and a minimum breaking strength of 6 kN/km
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