ABB REG316 4 Series - Guidelines for Wiring Rack Assemblies

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. C
7-6
7.2.2.2. Guidelines for wiring rack assemblies
Where digital protection devices (individual units) or protec-
tion systems are supplied in a rack, it is essential that the bi-
nary inputs and outputs (BIO’s) and the auxiliary supply which
have to be wired from the rack to the cubicle terminals be run
separately from the c.t. and v.t. cables (not in the same duct or
loom).
This precaution reduces the parallel coupling of conducted
interference.
Should this not be possible along the whole route, parallel cou-
pling can be reduced by crossing at right angles. Complete
separation, however, is to be preferred.
RE. 316*4
Aux. supply
Aux. supply
Crossing
c.t's/v.t's
c.t's/v.t's
Terminals
Fig. 7.4 Separation of rack wiring in a cubicle