Three-Phase Cables Need More Than a Cable Tie

In three-phase power installations using single core cables, the arrangement and restraint of the cable grouping is an engineering requirement, not a cable management preference. Under normal operating conditions, single core cables in a three-phase system carry unbalanced magnetic fields that create inter-phase forces between conductors. Under fault conditions, those forces multiply dramatically and can violently displace cables that are not properly restrained. Trefoil cable cleats are the engineered solution to this requirement, and Paprsky Trefoil Cable Cleats are built to hold three single core cables in the correct trefoil configuration securely, permanently, and in compliance with the demands of medium and high-voltage power installations.

What Are Trefoil Cable Cleats?

Trefoil cable cleats are two-part mechanical fixing devices designed to hold three single core cables simultaneously in a trefoil arrangement - a triangular grouping where each cable occupies one of three formed profiles within the cleat body. The upper and lower halves of the cleat are bolted together around the cable group, fixing all three conductors in their correct relative positions and securing the entire assembly to the installation surface. This arrangement maintains the required spacing between conductors, prevents cable movement under electromagnetic forces, and ensures the installation meets the structural and electrical requirements of three-phase single core cable systems. Paprsky Trefoil Cable Cleats are manufactured from aluminium alloy with an epoxy coating, incorporating rubber inserts within the cable contact profiles to protect cable outer sheaths from abrasion during installation and throughout the service life of the cleat.

Product Information

Paprsky Trefoil Cable Cleats are available in twelve variants covering cable outer diameters from 30mm up to 180mm, accommodating the single core cable sizes used across medium voltage distribution, high-voltage power infrastructure, and large-scale industrial power installations. The range spans ALTCP-301-EC for 30 to 40mm cable OD through to ALTCP-312-EC for 160 to 180mm, providing complete coverage of the cable diameters encountered in three-phase single core cable installations from sub-transmission through to main distribution level. Each cleat is supplied with three MS zinc passivated plated bolts, nuts, and plain washers for direct structural surface fixing. The aluminium alloy body with epoxy coating provides corrosion resistance for both indoor and outdoor installation environments, and the non-magnetic material construction ensures the cleat body itself does not contribute to eddy current losses or electromagnetic interference in the cable system.

Key Features 

• Twelve size variants covering cable outer diameters from 30mm to 180mm for three-phase single core cable installations
• Non-magnetic aluminium alloy construction with epoxy coating prevents eddy current losses and provides corrosion resistance
• Rubber inserts within cable contact profiles protect cable outer sheaths from abrasion at the cleat fixing point
• Trefoil configuration design maintains correct inter-phase spacing and cable arrangement throughout the installation
• Supplied with three MS zinc passivated plated bolts, nuts, and plain washers for complete structural fixing
• Two-part bolt-together body allows installation around existing cable runs without requiring cable end access
• Suitable for indoor and outdoor installation environments across medium and high-voltage power cable systems

Industrial and Professional Applications

• Medium and high-voltage power distribution for securing three-phase single core cable groups along cable ladders, trays, and structural supports in substation and switchroom environments
• Industrial power infrastructure for fixing large single core feeder cable groups between transformers, switchgear, and distribution boards in plant and manufacturing facilities
• Utility and grid infrastructure for restraining three-phase single core transmission cables in cable tunnels, underground routes, and overhead support structures
• Renewable energy and solar installations for securing three-phase AC output cable groups from large inverters and transformers along support structures and cable routes
• Construction and building services for fixing three-phase single core main supply cables in plant rooms, riser shafts, and primary electrical service routes

Engineering the Cable System to Stay in Place

A three-phase single core cable installation that is not properly cleated in trefoil is a system that relies on luck rather than engineering to survive a fault event. Paprsky Trefoil Cable Cleats remove that risk entirely, providing twelve size variants that cover every cable diameter from 30mm to 180mm, non-magnetic aluminium construction that contributes nothing unwanted to the cable system, and a rubber-lined profile that protects the cable at every fixing point. This is the cleat specification that three-phase single core cable installations are built around.

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Trefoil Cable Cleat