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twisted triad vs twisted pair

twisted triad vs twisted pair

twisted triad vs twisted pair

(OP)
Our electrician wants to use twisted, shielded triad (3 conductor) wire for an analog signal (4-20mA). I specified twisted pair, shielded but the question has been posed to me. My instinct says this will not perform as well as a twisted pair because the opposing magnetic fields of the two wires will not be 180 degrees apart due to the extra conductor in the twist.

Anyone try this before? Any feedback?

RE: twisted triad vs twisted pair

(OP)
Thats the problem, the third conductor is not needed and leaving it floating or grounding seems counter intuitive.  

 

RE: twisted triad vs twisted pair

(OP)
I will make them use what I specified.
Thanks IR.

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