Why this exact cable keeps turning up in control cabinets

Walk into almost any processing plant and you will find the same cable doing the same unglamorous job. A shielded PVC insulated instrument cable, 2x1.5mm2, running from a pressure or temperature transmitter back to a PLC input card. It is the two-core screened cable engineers reach for when a 4-20 mA loop has to survive a hall full of motors, drives and switching gear.

Shanghai Shenghua Cable has been making this type of cable for 29 years on its own lines in Hebei, China. Cores are stranded and insulated in-house, the copper braid screen is applied on dedicated equipment, and every reel goes through electrical and dimensional checks before dispatch. Test records stay on file, so a buyer can ask for the batch data later and actually get it. A live factory video walkthrough can be arranged, and inspection reports or certificates are shared once an order is confirmed.

What the copper braid screen really does

Signals from sensors are small. A 4-20 mA loop can swing just a few millivolts at the receiving end, and electrical noise from a variable-frequency drive a few metres away is more than enough to corrupt it. The copper braid wrapped around the insulated cores acts as a conductive barrier. Interference that hits the cable is caught by the braid and sent to ground instead of into the signal pair. That single idea is the whole reason shielded construction exists.

Unshielded cable is cheaper and perfectly fine on a short run inside a quiet panel. The moment you pull past a drive, a welding bay or a bank of contactors, the screen stops being a nice-to-have and becomes the reason your readings stay steady.

The 2x1.5mm2 specification, line by line

Where it fits on site

• Process instrumentation loops: pressure, temperature and flow transmitters wired back to the control room.
• Low-level analog and measuring circuits where electrical noise would otherwise distort readings.
• Panel wiring and cable tray runs in manufacturing and processing facilities.

The 1.5mm2 stranded copper is flexible enough for bending in trays, ducts and tight control panels, and the gauge lines up neatly with typical 4-20 mA transmitter and sensor circuits.

Questions buyers ask before ordering

Is it suitable outdoors or for direct burial? The PVC sheath handles moisture and abrasion well in dry and damp indoor areas and protected tray runs. For permanent outdoor UV exposure or direct burial, confirm with the factory whether an added sheath or armour option is available, because the standard build is not designed for it.

Will it fit standard terminals and glands? Yes. IEC 60228 conductor class keeps it compatible with standard terminal blocks and cable glands, so it drops straight into existing panels.

Can I get documents for a tender? Shanghai Shenghua Cable keeps test data for each production batch and supplies inspection reports, plus ISO 9001:2015 and CCC certificates on request. The compliance paperwork supports tender and project submissions.

The short version

If your loop runs anywhere near equipment that switches, specify the screened version. The 2x1.5mm2 shielded PVC insulated instrument cable is the standard answer, and it does the job without fuss.