What connector should be used to splice a 15 kV shielded cable?

• A. Compression
• B. Solder
• C. Crimp
• D. Mechanical lug

Answer: (D)

When working with high-voltage, shielded cables, the splice needs a connection that is mechanically strong and specifically rated for the voltage while preserving insulation and shielding. A mechanical lug is designed to provide a secure, bolted termination that clamps onto the conductor and accommodates the shielding/ drain path as required, with appropriate creepage distances and insulation containment. It offers a robust, field-serviceable connection that resists vibration and temperature cycling, which are common in HV installations.

Solder joins are not suitable for high-voltage splices because they can become brittle and travel changes with heat and stress, leading to unreliable current paths. Crimp or compression methods require precise tooling and are sensitive to proper execution; if not done perfectly, they can introduce resistance and future failure. The mechanical lug method provides a straightforward, certified way to join conductors at 15 kV while keeping the shielding properly connected and the overall splice safely contained.