Instrumentation cable

Instrumentation Cable

General Construction and Material Details The
cable is manufactured with the following components. Brief form details of the basic raw materials used are given as customer general information.

CONDUCTOR:
The conductors used are of high purity. H. 99.99% Electrolytic (EC) Copper. Copper is annealed to the standards specified in IS:8130 for best results in terms of conductivity, expandability, flexibility, brightness and oxygen scavenging properties. Generally, ANEALED Tinned Copper is used for electrical cables, and ANEALED BARE COPPER TYPE is used for wires.

INSULATION:
Unless otherwise specified, the following types of insulation are used.
1. PVC (Polyvinyl Chloride) Temperature 70°C
2. PVC (Polyvinyl Chloride) Temperature 85°C

Polyester tape in various thicknesses from 20 microns up to 70 coils 50 microns. These tapes protect cables from moisture and temperature.

SHIELDS:
Cables thus formed are shielded or shielded in the following versions. The entire
copper braid is shielded.
all poly aluminum tape shield
The twisted pairs are individually shielded and covered with poly aluminum tape throughout. Individually
twisted pair and copper braid shield.

INNER JACKET: 

Cable bundles and polyester bandages formed 

after laying are protected with an armored cable by an intermediate layer of PVC. The thickness of the inner jacket is different for each size. The minimum thickness of the inner sheath must be 0.3 mm.

ARMOR:
Armor is provided to protect cables from mechanical damage such as drilling, heavy material damage and being run over by vehicles. The type of armor offered is galvanized iron wire (GI) for diameters less than 13mm or GI strips for diameters greater than 13mm.

 Outer jacket
Cable bundles shielded in this way are protected by an outer jacket made of:
PVC (polyvinyl chloride) Temperature range -15°C to +70°C.
PVC (polyvinyl chloride) temperature range -15°C to +85°C

Instrument cable layout shows instrument cable routing according to plant or platform layout. In addition, Instrument Cable Management displays details related to instrument cables such as:

Location of field devices to be connected

Junction box location

Cable number

Cable goes up/down

Reference Drawing: Instrument Location Plan

In the instrument location plan, ignore the instrument that does not require wiring, such as pressure gauges, pressure relief valve, etc.

Accordingly, direct the electronic device to the nearest junction box (make the necessary separation from the junction box for analog or digital, SIS or BPCS or Fire & Gas, IS or Non-IS).

Route the multi-pair/multi-core cable from the junction box to the control room/other rooms.

Cable runs should be as short as possible, but consider some factors to avoid, such as high interfering noise, hot source, etc. See API 552.

Purpose of device cable arrangement

The instrument wiring arrangement together with the wiring block diagram are to be used as a reference for preparing the instrument wiring schedule when determining the following:

List of required cable and its length

Source and destination connection point of the end of the cable

The arrangement of instrument cables is also a reference to identify the existence of all instrument cables in a plant or platform.

No example is given here because the arrangement of the instrument cables depends on the layout of the plant or platform. However, the symbols below may be used for items related to the device's cable management.