(57) ©7 Providing an electrical conductor (10) with an insulation layer having a layer
of dielectric carrier with magnetically permeable particles dispersed within the carrier,
in which homogeneity is maintained in a fluid mixture (18) of a fluid carrier and
the particles, the conductor is moved vertically through a die means (16) to coat
it with a fluid layer of the mixture, the fluid carrier is dried and thickness of
the dried insulation layer is controlled. This control is achieved by monitoring the
thickness or diameter of the dried layer and, if a variation exists between the monitored
and required values, the rate of fluid flow through the die means is adjusted to adjust
the monitored values towards that required.
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