Instrumentation cables are used to connect various instruments for communicating with each other or with the control systems, mainly in process plants. These are also used for connecting controlling & monitoring devices & signal transmission.
Variants of Instrumentation Cables:
Instrumentation cables are available in Unshielded or shielded as well as Un-armoured & Armoured constructions. These are mostly used for fixed installations or limited flexing applications.
The shielded cables are typical with a foil shield, braid shield, or combination of the two.
These cables are mostly in Pairs or Triads. Various instrument cable types are available in the market.
Type of Insulation & Sheathing:
Best Instrument cables generally have PVC or XLPE insulation & PVC or XLPE sheathing. However, other insulating & sheathing materials are also used based on the type of application & place of installation such as TPE; PUR; LSZH; Nylon; EPR rubber; Teflon, etc
Conductor: Stranded bare copper or tinned copper of Class 2 or Class 5
Insulation: XLPE or PVC (mostly) or TPE/ Halogen-free compound
Cores laid & twisted to form pairs or Triads.
For Pairs- two cores are twisted together with short lay-lengths
For Triads- three cores are twisted together.
For Shielded Version: Aluminum Foil with Drain wire or Tinned copper braiding for EMI/EMC protection in Instrumentation Cables.
Outer Sheath: PVC/ XLPE/ POLYURETHANE/ EPR/ HALOGEN FREE COMPOUND / SILICON / TEFLON etc
Outer Sheath Colour – Black or Grey for general applications & Blue for Intrinsically Safe areas.
Typical Voltage Grades:
300/ 500 V or 600/ 1000 V
EN 50288 (formerly BS 5308) is the widely used standards
RoHS/ REACH / CE