Power cables are electrical cables that have one or more electrical conductors to transmit electrical power. While power cables can be in the form of permanent wiring inside a building, power cables can also come in a flexible form that is used for different purposes. Renowned inventor, Thomas Edison, first discovered a basic version of the current power distribution system in 1882. In Singapore, the modern-day power cables are available in an array of materials, types and sizes that are specific to its applications. Power cables are often constructed with three main components that are determined based on the current-carrying capacity, working voltage and environmental conditions.
The working voltage of the to-be-constructed cable will determine the required thickness of the insulation, while the current-carrying capacity will decide the cross-sectional area of the conductor within the cable. When determining how to construct the cable and the required materials, environmental conditions like sunlight exposure, the presence of water and temperature will have to be taken into account. For cables that have to be sheathed, the environmental conditions will also play a part when deciding on the materials needed for the sheath.
High voltage power cables with circuits that are operating around 2,000 volts and above may require a conductive shield surrounding each conductor. That will ensure that each insulated conductor receives an equal amount of electrical stress. The shield may be referred to as a Hochstader shield, as Martin Hochstadter first patented the concept of a conductive shield in 1916. The modern-day high voltage cables use polymers like polyethylene for insulation. Cross-linked polyethylene (XLPE) is a commonly found in insulation for high voltage cables, although its uses can range from chemical transportation to pipework systems in building services. The rated maximum conductor temperature of cables insulated with XLPE is 90°C, although the emergency rating can reach 140°C. For high voltage cables, modified XLPE insulations can help to limit the amount of by-product gases that were generated during the process, shortening manufacturing time needed for the cables.
Contact Max Cable today to find the power cables you require for your businesses in Singapore. We have a range of cables from XLPE-insulated cables to marine cables.