A clamp device for a long component is engaged to a conductive stud attached to a conductive support, in order to conductively mount the long component to the support. A low voltage section is configured to provide a low voltage connection, wherein a barrier isolates the low voltage connection. According to the invention, the interior of the enclosure is disinfected with each washing procedure. The LED groups 25 include a middle LED group 28 and an end side LED group 29. The trigger signal is generated by one of the system controller, the audio codec, and a power circuit supplying electric power to the system controller, the audio codec and the switch controller upon occurrence of a condition associated with pop noise, and is outputted to the switch controller before the pop noise is generated, such that the pop noise is conducted to ground via the switch unit.