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Commonly seen CT Chain Installation errors
Commonly seen CT Chain Installation errors

This article highlights the most frequently observed mistakes during CT chain installations, such as incorrect polarity, loose connections, mismatched CT ratings, and improper grounding.

Updated over 2 weeks ago

Data Cable - Common errors

  1. Cable connector is not well-seated in the socket. It can be easily pulled off.

Data Cable - Correct Way

  1. Insert data cable connector to the socket until hearing a “click” sound. It cannot be easily pulled off once well-seated.

HCIM - Common Errors

  1. Pins of the large current CTs are not well-seated in the HCIM.

  2. color of the CT2’s pins do not match terminal blocks’ color.

HCIM - Correct Way

  1. Press the button on top of each block terminal to open up the clip.

  2. Insert pins of the large current CTs into the HCIM block terminals.

  3. Well-seated pins cannot be easily pulled out.

  4. The color of each pair of pins match terminal blocks’ color.

Smart CT - Common errors

  1. Ends of the CT left open

  2. CT’s load arrow goes into the breaker (right)

Smart CT - Correct Way

  1. CTs are well clipped with both ends touching firmly.

  2. Load direction goes away from the breaker

Hinged CT - Common Errors

  1. CT is not well clipped.

  2. Load arrow goes into the breaker.

  3. Hinged CT is not well clipped. It can be easily pulled off.

Hinged CT - Correct Way

  1. Push the clips till fully closed.

  2. Well-clipped CTs cannot be pulled open easily

Rogowski Coil - Common Errors

  1. Loosely connected coil can be easily pulled open.

Rogowski Coil - Correct Way

  1. Make sure the connectors are clipped well and it cannot be easily pulled open.

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