Electronics & Signal
Communication, Data & Signal Harness
- 30 V to 300 V; 80 °C and 105 °C multi-conductor cable
- 2 to 50 conductors; twisted pairs and individually shielded groups
Electronics & Signal Wire Harness
Shielded data, communication and encoder assemblies where the shield termination and the pair geometry decide whether the signal survives.
2harness lines
7application groups
Signal harnessing is judged by what it rejects rather than by what it carries. An encoder cable that passes a continuity check can still drop counts, because the failure is an imbalance introduced at the termination rather than a broken conductor. The shield has to be continuous, the drain has to land where the schematic says, and the pairs have to stay pairs up to the contact.
The cable lines used here are the shielded multi-conductor styles from the UL flexible industrial control series, chosen for the flex regime the route imposes and terminated with the connector series the equipment uses.
Screen choice follows the threat. A foil tape with a drain conductor is the light option and works well against capacitive coupling at low frequency; it is fragile at the point where it is terminated and it does not survive repeated flexing. A braid is heavier and more expensive, survives movement, and can be clamped to a backshell in a full 360° ring, which is the only way to make a shield useful at radio frequencies. Where the environment has both problems, the two constructions are used together.
Termination decides whether any of that matters. A drain wire picked up on a long pigtail has a self-inductance that negates the screen above a few megahertz, so the drain is brought out hot and landed on the connector shell or the designated pin. Pairs are kept twisted to within a short tail of the contact, and where the cable passes through a splice or a ferrite the pair geometry is restored rather than approximated. In a drag-chain route the shield has the same rule as the conductor: it has to be rated for the flex, not only for the signal.
Class 2 and low-voltage signal runs are a separate set of lines — UL1631, UL1792, UL1637 and UL1745 among them — where the insulation system and the shield are chosen together and the 30 V rating of the standard is not a statement about the signal itself. Equipment that needs a shielded pair at 30 V is not the same as equipment that needs a coaxial 75 Ω run; the coaxial lines such as UL1354 are a distinct family and are quoted as such.
Electronics & Signal harness lines
Each line states the wire it is built on, the conductor range, the termination style and the inspection method.
Electronics & Signal
Sensor & Encoder Cable Assembly
- 30 V to 300 V; 80 °C to 105 °C on the shielded multi-conductor lines
- 4 to 15 conductors — power pair, A/B/Z channels, optional temperature pair
Other harness application groups
Electronics & Signal harness questions
What buyers ask before they send a drawing for this group.
How do you choose between a foil screen and a braided shield?
Foil with a drain is lighter and cheaper and suits a static run where the interference is low-frequency and capacitive; a braid costs more but survives flexing and can be clamped in a full ring. If the cable moves, or if the interference has a radio-frequency component, the braid is the honest answer. A combined foil-and-braid construction is used when the route has both problems.
Where should the shield be terminated?
Where the schematic says, and normally at one end only for a low-frequency signal, or at both ends through the connector shell for a radio-frequency one. What matters is that the decision is deliberate: the drain is brought out hot and landed on the designated pin or the shell, not left on a pigtail. A pigtail looks terminated and behaves as an antenna.
What does a shielded harness fail on in the field?
Almost never the conductor. The failures reported to us are a drain terminated on a long tail, a pair untwisted over the last few centimetres into the contact, a shield crushed under a moulded backshell, or a foil tape that fatigued where the cable flexes. All four are visible in the drawing and in the first article, which is why the sample stage is where they are caught.
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