Power Supply Connections; Earth Connnection; Current Transformers - GE P642 Technical Manual

P64x
4.2

POWER SUPPLY CONNECTIONS

These should be wired with 1.5 mm PVC insulated multi-stranded copper wire terminated with M4 ring terminals.
The wire should have a minimum voltage rating of 300 V RMS.
Caution:
Protect the auxiliary power supply wiring with a maximum 16 A high rupture capacity
(HRC) type NIT or TIA fuse.
4.3

EARTH CONNNECTION

Every device must be connected to the cubicle earthing bar using the M4 earth terminal.
Use a wire size of at least 2.5 mm
Due to the physical limitations of the ring terminal, the maximum wire size you can use is 6.0 mm
terminals that are not pre-insulated. If using pre insulated ring terminals, the maximum wire size is reduced to 2.63
2
mm per ring terminal. If you need a greater cross-sectional area, use two wires in parallel, each terminated in a
separate ring terminal.
The wire should have a minimum voltage rating of 300 V RMS.
Note:
To prevent any possibility of electrolytic action between brass or copper ground conductors and the rear panel of the product,
precautions should be taken to isolate them from one another. This could be achieved in several ways, including placing a
nickel-plated or insulating washer between the conductor and the product case, or using tinned ring terminals.
4.4

CURRENT TRANSFORMERS

Current transformers would generally be wired with 2.5 mm
with M4 ring terminals.
Due to the physical limitations of the ring terminal, the maximum wire size you can use is 6.0 mm
terminals that are not pre-insulated. If using pre insulated ring terminals, the maximum wire size is reduced to 2.63
2
mm per ring terminal. If you need a greater cross-sectional area, use two wires in parallel, each terminated in a
separate ring terminal.
The wire should have a minimum voltage rating of 300 V RMS.
Caution:
Current transformer circuits must never be fused.
Note:
If there are CTs present, spring-loaded shorting contacts ensure that the terminals into which the CTs connect are shorted
before the CT contacts are broken.
Note:
For 5A CT secondaries, we recommend using 2 x 2.5 mm
P64x-TM-EN-1.3
2
terminated with a ring terminal.
2
PVC insulated multi-stranded copper wire.
2
PVC insulated multi-stranded copper wire terminated
Chapter 18 - Installation
2
using ring
2
using ring
399