ABB REG316 4 Series Operating Instructions Manual page 605

REG 316*4 1MRB520049-Uen / Rev. C
Screened leads must be used for the c.t. and v.t. wiring from
the terminals to the equipment.
Recommendation
It is also recommended to use screened leads for the binary in-
puts and outputs (BIO's) and the auxiliary supply.
The following applies if the equipment is not installed in a
cubicle:
The terminals should be as close as possible to the equipment
terminals so that the unscreened lengths of cables are very
short!
Screened c.t., v.t., binary input and output and auxiliary supply
cables can be secured in one of the following ways:
Assemblies fitted into panels:
C.t. and v.t. leads to the terminals can be secured, for example,
to a surface (steel rail) using cable clamps. The surface must be
in direct contact with the plant ground and the cable screens
must make good contact with the cable clamps all the way
round.
This, however, is not always the case and the screen is fre-
quently not in contact at the sides which impairs the screening
effect. To overcome this drawback, a special ** copper braid
tape can be wound on top of the cable screen in the region of
the clamps. This then ensures maximum screening efficiency.
** Suitable tinned copper braid tape is available from 3M under
the designation:
"Scotch No. 24"
(Fitting instructions should also be requested.)
Assemblies fitted into cubicles:
(2 alternatives)
a) The c.t. and v.t. cables going to the terminals can pass
through cable glands. Again the cable screens must be in
good contact with the gland all the way round and the gland
with the plant ground (e.g. via the panel or strip material in
which the gland is fitted).
ABB Switzerland Ltd
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