Areva MiCOM P921 - Page 329

P92x/EN IN/E11 Technical Guide
Installation
Page 8/10 MiCOM P921-P922-P923
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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, AREVA can supply M4 90° crimp ring terminals in five different sizes
depending on wire size (see Table 3 and Table 4). Each type is available in bags of
100.
Part number Wire Size Insulation Colour
ZB9124 901 0.25 – 1.65 mm
2
(22-16AWG)
P0404XXa
Red
ZB9124 900 1.04 – 2.63 mm
2
(16-14AWG)
P0405XXa
Blue
ZB9124 904 2.53 - 6.64 mm
2
(12-10AWG) Uninsulated*
TABLE 3 : M4 90° CRIMP RING TERMINALS
Part number Wire Size
ZB9128 015 0.75 – 1.5 mm
2
P0406XXa
ZB9128 016 1.5 –2.5 mm
2
P0407XXa
TABLE 4 : M4 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:
- Auxiliary Supply, Vx 1.5 mm
2
- RS485 port See separate section
- Other circuits 1.0 mm
2
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
2
using ring terminals that
are not pre-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
2
per ring terminal. If a
larger wire size is required, 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 300Vrms.