Documents

Investigations into Electromagnetic Noise

High frequency ballasted lighting presents a well known electromagnetic interference threat. Switching frequencies from these types of lighting control-gear are typically 40kHz – 120kHz producing significant interference up to 10’s of MHz. During a large scale modernisation of urban metro rail stations in London, UK, it was necessary to implement an unusual combined lighting and communications cable management system which co-located lighting and safety related communications systems due to heritage planning restrictions at a particular station



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