ALPAR lightning protection cross connector 4-screw model G40

ALPAR lightning protection cross connector 4-screw model G40 is a mechanical and electrical connector designed for use in external lightning protection and earthing networks. The connector provides a four-point fastening arrangement that secures and bonds multiple conductors at a cross junction, ensuring reliable continuity of the lightning down-conductor or earthing conductors while offering corrosion-resistant contact suitable for outdoor installations.

Advantages

The connector’s four-screw design delivers uniform pressure across conductors, improving mechanical stability and low-resistance electrical contact. Constructed from materials suitable for outdoor use, it resists corrosion and maintains conductivity over time. Its compact cross shape allows neat routing of intersecting conductors and simplifies installation at junctions without the need for specialized tools beyond standard hand tools.

Suitable for

• Bonding multiple lightning down-conductors at a cross junction
• Connecting earthing conductors in external grounding systems
• Field installations where corrosion-resistant, durable connections are required
• Retrofit or new-build lightning protection networks

When it may not be suitable

This connector is intended for use with conductors and environments typical of lightning protection and earthing systems; it may not be appropriate for fine-stranded flexible conductors that require specialized clamps, for conductors above the connector's mechanical capacity, or for applications demanding insulated or sealed joints. For buried or fully submerged connections, a dedicated sealed connector designed specifically for such conditions should be used.

Key specifications

• Type of connection: four-screw cross junction for conductor bonding
• Application: external lightning protection and earthing systems
• Contact: corrosion-resistant conductive materials suitable for outdoor exposure
• Mechanical fastening: four threaded screw clamps for secure conductor retention
• Mounting: inline cross configuration for intersecting conductors

How to use

Position the cross connector at the intended junction point and insert each conductor into its respective channel. Tighten each screw progressively and evenly to achieve uniform clamping pressure and secure electrical contact. Ensure conductor surfaces are clean and free of paint or heavy oxidation before making the connection. After tightening, verify mechanical stability and continuity with appropriate testing equipment according to applicable standards and local regulations.

What to consider before purchase

• Compatibility with conductor sizes and types used in your lightning or earthing system
• Environmental exposure and whether additional corrosion protection or sealing is required
• Mechanical capacity for tension, wind load, or other site-specific forces
• Compliance with local lightning protection and electrical earthing standards

Usage recommendations

Use standard torque values recommended for similar screw-type connectors and recheck tightness after initial thermal cycling. Inspect connections periodically for corrosion or loosened screws and replace the connector if signs of degradation appear.