It is important to remember that all equipment which is connected to the mains is a
potential source of hum and interference and may radiate both electrostatic or
electromagnetic radiation. In addition, the mains will also act as a carrier for many
forms of RF interference generated by electric motors, air–conditioning units,
thyristor light dimmers etc. Unless the earth system is clean, all attempts to improve
hum noise levels will be futile. In extreme cases there will be no alternative but to
provide a completely separate and independant ‘technical earth’ to replace the
incoming ‘noisy earth’. However, always consult your local electricity supply
authority to ensure that safety regulations are not being infringed.
Installation December 1994 2.7
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