Lapp Group registered a patent for a luminous cable which ‘charges’ in daylight or artificial light and then emits a clearly visible blue or yellow glow for at least six hours. This can be employed to aid orientation and safety in applications such as concerts or other large scale events, in poorly lit rooms, houses, halls or on construction sites, as well as providing visual appeal for advertising.
The luminescence is generated by patented pigments that are mixed into PVC or PUR cable sheaths. The pigments are classified as non-poisonous and do not emit any dangerous radiation, nor do they grey over time. They can be charged as often as required by exposure to light, and their light intensity and persistence values are well above the specifications of DIN 67510-4 - even after three hours, their light intensity is almost double the level prescribed in the DIN standard after one hour.
During production, the luminous layer is either applied to the entire sheath or added in stripes covering, for example, 30% or 70% of the sheath, in a similar way to a green/yellow earth wire. In order to protect the cables from wear and damage, a very thin, transparent outer sheath can be added. This makes the cable easy to clean without affecting the performance of the luminous layer. Sample cables in yellow and blue are available on request.
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