ABSTRACT
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 things in general terms. However, it is
always imperative to discuss earthing matters with a local, licensed electrician who is fully
acquainted with the local regulations. There is an inherent problem in this, though, because
many qualified electricians are totally unfamiliar with the concepts of technical earths, and
even professional studios sometimes encounter problems with such negotiations.
