Shielded Cable for CT & PT Wiring

[Sunny_92]

Is it typical to use shielded cable for CT and/or PT secondary wiring? I'm working on a design for a small substation and would like to get a better idea of when it's best practice to use shielded cable. Thanks!

 

[ATSman]

I don't know what the code states but in all my 46yrs in the field I have never seen shielded cable in this application or any problems caused by not using it.

 

[Ingenieur]

same here (only 35 years though, lol)
never saw shielded used

 

[Open Neutral]

Shielded vs. twisted pair?

The CT loop will be very low impedance; I'm dubious about it picking up anything coupled.
PT is another story

 

[epimetheus]

Shielded is typically used in extra high voltage substations (230kV and up), and sometimes in lower voltage subs for cap banks.

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