CHAPTER 25
Main Supplies and Earthing Systems
Safety and technical earths. Sources of interference problems. The need for low impedances. Mains filtering. The number of phases. Power conditioners. Balanced power.
25.1 The Ground Plane
Large professional studios often have ‘technical earth’ systems, where a dedicated earth is sunk into the ground, to which no equipment is connected other than the audio equipment. Sometimes this earth is isolated from other earths, and sometimes it is bonded to the earth which is used by the electricity supply company. The regulations about this vary greatly from country to country, and even from region to region, so in a book such as this, designed for an international readership, it is only possible to discuss ...
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