The sensor cable screen or steel wire armour (or braid), as appropriate,
should be connected to the system (protective) earth. This can be
achieved where the cable enters the cabinet by using a metal cable
gland, or by other suitable means, and avoiding any screen 'tails' within
the cabinet.
Where the cable consists of a separate screen sheath and wire armour
(or braid), the armour should be connected, at the cabinet entry, to the
protective earth and the screen sheath should be connected to the
GROUND terminal of the Quad Relay Interface Card or to a suitable
instrument earth point.
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