Relay Wiring; Medium And Heavy Duty Terminal Block Connections; Rs485 Port; M4 90° Crimp Ring Terminals - GE MiCOM P40 Agile Technical Manual

Installation
MiCOM P40 Agile P442, P444
6

RELAY WIRING

This section serves as a guide to selecting the appropriate cable and connector type for
each terminal on the MiCOM relay.
6.1

Medium and heavy duty terminal block connections

Loose relays are supplied with sufficient M4 screws for making connections to the rear
mounted terminal blocks using ring terminals, with a recommended maximum of two ring
terminals per relay terminal.
If required, we can supply M4 90° crimp ring terminals in three different sizes depending on
wire size (see Table 3). Each type is available in bags of 100.
Part number
ZB9124 901
ZB9124 900
ZB9124 904
Table 3 - M4 90° crimp ring terminals
* To maintain the terminal block insulation requirements for safety, an insulating sleeve
should be fitted over the ring terminal after crimping.
The following minimum wire sizes are recommended:
Current Transformers
Auxiliary Supply, Vx

RS485 Port

Other circuits
Due to the limitations of the ring terminal, the maximum wire size that can be used for any of
the medium or heavy duty terminals is 6.0 mm
insulated. Where it required to only use pre-insulated ring terminals, the maximum wire size
that can be used is reduced to 2.63 mm
two wires should be used in parallel, each terminated in a separate ring terminal at the relay.
The wire used for all connections to the medium and heavy duty terminal blocks, except the
RS485 port, should have a minimum voltage rating of 300 Vrms.
It is recommended that the auxiliary supply wiring should be protected by a 16 A high rupture
capacity (HRC) fuse of type NIT or TIA. For safety reasons, current transformer circuits must
never be fused. Other circuits should be appropriately fused to protect the wire used.
6.2 RS485 port
Connections to the RS485 port are made using ring terminals. It is recommended that a 2
core screened cable is used with a maximum total length of 1000m or 200 nF total cable
capacitance. A typical cable specification would be:
Each core:
Nominal conductor area:
Screen:
Wire size
2
0.25 – 1.65 mm (22 – 16AWG)
2
1.04 – 2.63 mm (16 – 14AWG)
2
2.53 – 6.64 mm (12 – 10AWG)
2
2.5 mm
2
1.5 mm
See separate section
2
1.0 mm
2
per ring terminal. If a larger wire size is required,
16/0.2 mm copper conductors
PVC insulated
0.5 mm
Overall braid, PVC sheathed
Insulation colour
Red
Blue
Uninsulated*
2
using ring terminals that are not pre-
2
per core
P44x/EN IN/Hb6
(IN) 14-13