On Fri, 1 Dec 2017 09:31:35 -0000, "Brian Gaff"
wrote:

So, how do we feel that buzz on exposed metal. Its obviously electrostatic
in nature as my aluminium white canes exposed metal parts do it I walk close
to any pylons for example.
Brian

The buzz on exposed metal is easy. It requires that the item is not
earthed, and has a pair of small anti-EMC capacitors from live to
chassis, and neutral to chassis. They form a capacitive potential
divider which will put the chassis at half mains voltage when it is
not attached to anything grounded.

The capacitors have a high impedance (about 3 Megohms) at 50Hz, so you
won't feel anything more than a slight tingle when you touch the
chassis. Once the earth is established by the signal cables the
voltage disappears completely.

d

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