26
Making the electrical connections
Chapter 5
Installing the terminal
3
Making the electrical connections
Always make sure established guidelines for this type of terminal is followed during in-
stallation. When necessary use screened twisted-pair cables to minimize susceptibility.
Otherwise use any kind of regular nonscreened tinned RK cable or equivalent.
When using screened cabling always use 360° full screen cable bushings to ensure
screen coupling. Ensure that all signals of a single circuit are in the same single cable.
Avoid mixing current and voltage measuring signals in the same cable. Also use sepa-
rate cables for control and measuring circuits.
3.1
Connecting the CT circuits
CTs are connected using back-side mounted screw connectors.
Use a solid conductor with a cross section area between 2.5-6 mm
2
(AWG20-10) or a
stranded conductor with a cross section area between 2.5-4 mm
2
.
3.2
Connecting the auxiliary power, VT and signal connectors
Auxiliary power, VTs and signals are connected using COMBICON (Phoenix technol-
ogy) plug-in screw connectors.
Procedure
1.
Connect signals to the COMBICON plug.
2.
Plug the connector to the corresponding back-side mounted
receptable.
3.
Lock the plug to the receptable by fastening the lock screws.
Use a solid or stranded conductor with a cross section area be-
tween 0.5-2.5 mm
2
(AWG24-12). Use a ferrule with plastic collar
to connect two conductors, cross section area between 0.5-1.5
mm
2
(AWG20-18).
Note!
Screened and twisted pair cables is a requirement for galvanic communications in ap-
plication with 56/64 kbit/s. The screen must be earthed at both sides of a cable.
