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Q&A

Comments on Is concentric twist a common practice?

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Is concentric twist a common practice?

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I have seen multiple sources on the web discussing what they call concentric twist harnesses. It boils down to having a wiring harness built in layers, where each layer is twisted around the previous one in alternating directions, as shown there :

Picture of a concentric twist harness Original tweet

While most of the arguments in favor of the technique make sense to me (space optimisation, less crosstalk between layers, better strain distribution between individual wires, and overall aesthetics), I cannot find any manufacturer specification, white paper, of other kind of litterature on the topic. It seems to only be used and talked about in motorsport communities, despite some calling it "Milspec wiring"

Is concentric twist a valid and common technique, a niche topic, or a broader concept, maybe under a different name?

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1 comment thread

We usually try to avoid lots of wires for lots of signals. (2 comments)
We usually try to avoid lots of wires for lots of signals.
Olin Lathrop‭ wrote over 1 year ago

Nowadays, you'd try to do that with high speed digital, multiplexing the various signals. I haven't specified a cable harness anything like that in such a long time that I have no idea what is customary with many-wire harnesses these days.

Sclrx‭ wrote over 1 year ago

That I agree with, the time of many-wires parrallel connectors is long gone, but as mentioned in the question, that type of wiring might still exist in niche application, that are high-speed enough to justify staying analog through the whole system. (without necessitating individual coax lines)