Summary

If having issues with your installed CTs, they likely stem from one or more of the issues covered in the troubleshooting steps below. Please complete the steps below, then follow up with your ETB point of contact. 

Steps

1. Ensure twisted pair wiring was used for any CT lead extensions (if not, replace it with 18 AWG twisted pair wire).
    
2. Ensure the CTs are fully seated(closed). 
   1. For Split Core: Ensure they have “snapped” together.
   2. For Rogowski Coil: Ensure the twist lock is fully engaged. 
       
3. Verify that the CT lead splice is good by performing continuity testing. 
   1. eGauge: How to Extend CT Leads
       
4. Verify that the CT lead wires are firmly connected to the 2-pin terminal block and not tightened onto any of the wire insulation. 
    
5. Ensure 2-pin terminal blocks are fully seated in the egauge sensor port.
    
6. Move any CT leads as far away from AC power conductors as possible with wire management and ensure CT leads do not share conduit with AC power conductors.
    
7. Field shorten any bundles of excess CT lead wire
   1. Example:
      
      
      
      
      
8. For Rogowski coils, ensure the black clasp is not touching  conductor. Eliminate as much of the orange part of the Rogowski coil from touching the conductor as possible. 

Next Steps

If the steps above corrected your issue, please notify your ETB point of contact and skip the steps below.
If you have tried all of the steps above and still have issues, continue with the steps below then coordinate with your ETB project manager for field support.

1. Perform continuity testing with the CT lead sets to ensure you have one positive and one negative going from the CT splice to the same 2 pin terminal block.
   1. If wires are switched between pairs, this can cause metering to appear to have a very flat wave form, low frequency and low power factor. 
       
2. Ensure CT placement is on the same voltage as the reference voltage.
    
3. Make sure reference voltage and CT location are on the same side of all transformers in the system
   1. If this is not the case it can cause a phase rotation error where the CT sine wave will not be able to line up with the voltage(reference voltage) sine wave.