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screened vs unscreened mining cable

5 Min Read
Shielding is one of the most critical structural elements in medium and high voltage mining cables, performing multiple vital functions that extend far beyond electromagnetic interference (EMI) protection. According to the U.S. Mine Safety and Health Administration (MSHA) regulations and IEC 60502 standards, shielding forms the first line of defense against ground faults, current leakage, and electromagnetic interference in harsh industrial environments. The letter "C" in German cable designations (such as NTSCGEWÖU) indicates the presence of a copper wire braided screen, while "CY" refers to compact copper shielding that provides 85% to 95% surface coverage, ensuring maximum protection in critical applications. In mining environments where equipment operates with variable frequency drives (VFDs), high-power motors, and sensitive monitoring systems, proper shielding is essential for both electrical safety and operational reliability. The IEEE 1580 standard for marine cables and ICEA S-75-381 for mining cables both specify detailed requirements for shielding construction and performance.
Technical Department
on16/01/2026

ما وظيفة التدريع في كابلات التعدين ومتى يكون تدريع CY ضرورياً؟

mining cable shielding, CY shielding, copper wire braid screen, EMI protection, MSHA cable, IEC 60502, DIN VDE 0250, ground fault protection, semiconductive layer, partial discharge, underground mining cable, trailing cable, VFD cable shielded, كابلات التعدين المدرعة, 礦用電纜屏蔽, electromagnetic interference, NTSCGEWÖU, NTMCGEWÖU, shield grounding
19 Min Read
BS 6708 Type 21 Trailing Cable
Technical Department
on17/11/2025

What is BS 6708 Type 21 Trailing Cable?

BS 6708 Type 21 mining cable represents an advanced variant of galvanized steel pliable wire armoured flexible cables specifically engineered for demanding mining and quarrying applications requiring a dedicated fourth earth conductor. This four-core configuration distinguishes Type 21 from the three-core Type 20, providing enhanced safety features and compliance with electrical regulations that mandate separate protective earth conductors in mining installations. Key Identification: Type 21 cables feature four unscreened cores (three phase conductors plus one earth conductor) laid up around an elastomeric cradle without contacting each other, protected by galvanized steel pliable armour between inner and outer sheaths. Rated at 640/1100V with a 3kV test voltage, these cables are designed for use in deep mines where explosive gases and dust can accumulate, as well as surface operations supplying excavating, crushing machines and equipment.
20 Min Read
Type 20 BS 6708 Mining Cable
Technical Department
on17/11/2025

What is Type 20 BS 6708 Mining Cable?

BS 6708 Type 20 mining cable represents a specialized category of galvanized steel pliable wire armoured flexible cables engineered for the most demanding mining and quarrying applications. This cable type is characterized by its robust construction featuring three unscreened cores laid up around an elastomeric cradle without contacting each other, protected by galvanized steel pliable armour that provides exceptional mechanical protection while maintaining the flexibility essential for mobile mining equipment applications. Key Identification: Type 20 mining cables are classified within BS 6708 as cables with galvanized steel pliable wire armouring, featuring unscreened cores and a rated voltage of 640/1100V. These cables are specifically designated for use in deep mines where explosive gases and dust can accumulate, as well as surface operations for supplying excavating, crushing machines, and equipment requiring robust mechanical protection.