Prysmian 20109501 is a BFOU(i) marine and offshore power and control cable with four cores of 1.5 mm² and a nominal outer diameter of 21 mm, in grey. The cable is mud-resistance halogen-free, flame-retardant, and fire-resistant to IEC 60331, meeting the S3/S7 requirements of NEK 606 for shipboard and offshore installations. Cross-linked insulation and low-smoke sheath support safety-critical circuits that must remain operational during a fire. Typical use is on vessels, drilling rigs, and offshore platforms for essential control, signalling, and low-power supply circuits.