Home Engineering Building Acoustics
Terminals are the usual plug receivers, switch housings, and lighting fixtures that can be found in a space. Most of the time, such terminals will not generate noise (unless they feature a small transformer). But they may weaken the sound reduction index of the partition in which they are mounted unless proper precautions are taken (Note: this is also true of the fire resistance of the wall or ceiling of interest!). As a rule of thumb, one should not have them back-to-back (i.e., leave at least 60 cm between them). When this proves impossible, one must try to reconstitute the wall or ceiling leaf behind the terminal box. If this still is too much of a delicate work, the last chance will be to coat the external sides of the terminal box using plaster.
Wiring does of course not generate noise. However, the crossing of walls and floors may constitute a weakness in the sound insulation unless proper measures are taken (i.e., filling the remaining cavity). When properly done, the wiring will typically run through a small- to medium-diameter pipe that will be included in the wall using the same type of material (i.e., plaster for a plasterboard partition or ceiling, concrete for a concrete wall or floor, etc.). Prior to being forced into a final position, the pack of wires will be wrapped using mineral wool.
Batteries and Static Convertors
Batteries will of course not generate noise. But they usually are located in a room where there will be an exhaust fan whose noise radiated to the outside environment (and sometimes even in the building; cf. Section 4.9.7) must be controlled. More to the point, there will often be an inverter nearby that will need some vibration control measures (i.e., mounting on a rigid steel frame resting on resilient pads).
Static convertors can be used to produce DC current out of the AC mains (the simplest of the static convertors is a fixed rectifier). In addition, they can be used to regulate the output voltage. While basically the main components are made of static elements (diodes, thyristors, etc.), there still are some elements that may generate noise and vibrations due to constriction (e.g., a winding or inductance). Therefore, it is necessary to provide vibration control measures for such an apparatus (cf. Section 4.9.9).
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