Twin and Earth - A flat grey thermo-plastic sheathed cable. Inside, it has two single conductors of the same size that are both separately insulated, one is brown in colour denoting its intended use as the line conductor, and the other is blue, denoting its intended use as the neutral conductor. A third un-insulated conductor sits between the two and this is used as the Circuit Protective Conductor or ‘earth’., Flex - A flexible cable that has a soft rubber or thermoplastic outer sheath and individually insulated conductors inside it. Each individual conductor is made up of very fine strands of copper to allow the cable to repeatedly flex., SWA - Steel Wire Armour - A cable that is surrounded by a layer of armour made up of steel wire, it is generally used where the cable requires a high degree of protection., LSHF - Low Smoke Halogen Free - A cable with a particular type of insulation that is designed so that it emits a small amount of smoke and zero halogen when exposed to fire or heat., Singles - A cable is a self contained single conductor, can refer to any cable that is singular,

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