The process by which transient voltage surges are prevented from reaching sensitive electronic equipment. See also surge protector.
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|SWA Steel wire armoured cable||
Steel wire armoured cable, commonly abbreviated as SWA, is a hard-wearing power cable designed for the supply of mains electricity. It is one of a number of armoured electrical cables – which include 11kV Cable and 33kV Cable – and is found in underground systems, power networks and cable ducting.
The typical construction of an SWA cable can be broken down as follows:
Conductor: consists of plain stranded copper (cables are classified to indicate the degree of flexibility. Class 2 refers to rigid stranded copper conductors as stipulated by British Standard BS EN 60228:2005)
Bedding: Polyvinyl chloride (PVC) bedding is used to provide a protective boundary between inner and outer layers of the cable.
Armour: Steel wire armour provides mechanical protection, which means the cable can withstand higher stresses, be buried directly and used in external or underground projects.
Sheath: a black PVC sheath holds all components of the cable together and provides additional protection from external stresses.
SWA cable can be referred to more generally as mains cable, armoured cable, power cable and booklet armoured cable. The name power cable, however, applies to a wide range of cables including 6381Y, NYCY, NYY-J and 6491X Cable.
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|SWC Small Works Contractor||
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A mechanical, optical, or optomechanical device that completes or breaks an optical path or routes an optical signal.
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A network that routes signals to their destinations by switching circuits or packets. Two different packets of information may not take the same route to get to the same destination in a packet switched network.
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SY Control Cable is a flexible instrumentation cable designed for measuring, control or regulation in the field of process automation.
It is a highly flexible multicore cable, with (class 5) copper conductors and a galvanised steelwire braid (GSWB) for mechanical protection. The cable is typically manufactured with PVC insulation, bedding and a transparent PVC sheath.
The transparent sheath means signs of deterioration, damage or corrosion can be detected with ease.
SY has a voltage rating of 300/500V and meets the requirements of both BS6500 and VDE0250 standards.
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Transmission in which the data is transmitted at a fixed rate with the transmitter and receiver being synchronized.
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