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. 
2.3.3.6  Current Transformers 
Current transformers would generally be wired with 2.5 mm
2
 PVC insulated multi-stranded copper wire 
terminated with M3.5 ring terminals. The wires should be terminated with rings using 90º rings 
terminals, with no more than two rings per terminal.  
Due to the physical limitations of the ring terminal, the maximum wire size you can use is 4.0 mm
2
 
using ring terminals. 
The wire should have a minimum voltage rating of 300 V RMS. 
 
Caution:  Current transformer circuits must never be fused.