PTE Link Boxes – Essential Cable Sheath Bonding and Protection
Power Transmission Equipment (PTE) is a leading manufacturer of power transmission equipment. Our Link Boxes answer critical challenges in high‑voltage single‑core XLPE cable systems. These boxes manage voltage build‑up, offer easy test access, and improve shield bonding—all to ensure reliable underground power networks.
Addressing Underground Cable Challenges
Underground systems face issues like poor thermal dissipation, space constraints, hidden faults, and high-frequency joint failures. Circulating currents in cable sheaths can cause heat, energy loss, and insulation damage. Lightning or fault surges introduce dangerous over‑voltages. That’s why Link Boxes are vital: they control induced sheath voltages and permit safe connections and bonding.
Benefits and Functions
Our Link Boxes limit sheath voltage while allowing technicians to access shield interruptions for testing. They support sheath bonding systems that:
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Boost current‑carrying capacity
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Enhance personnel safety
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Reduce circulating current losses in cable screens
These boxes keep induced voltages within safe limits by selecting bonding methods based on voltage, circuit length, load and fault currents, and cable layout.
Bonding Configurations Explained
PTE offers various bonding options using Link Boxes:
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Single‑Point Bonding: Ground sheath at one point. Simple but requires strong insulation elsewhere.
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Both‑End Bonding: Grounds the sheath at both ends through specialized enclosures. Best suited for circuits longer than 500 meters with minimal circulating current.
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Split Bonding: Introduces midpoint grounding with surge voltage limiters (SVLs), extending the effective range of single-point bonding while enhancing protection.
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Cross Bonding: Connects cable sheaths across segments to counteract induced currents. It balances voltages and minimizes energy losses across the system.
PTE Link Boxes: Reliable Performance
GCC utilities, contractors, and cable makers trust PTE Link Boxes for their durability. We build them to handle electrical, mechanical, and environmental stress. Each unit is type-tested to meet IEC standards. Enclosures use SS‑316, brass, and fiberglass. Each unit undergoes routine testing to guarantee high insulation, low contact resistance, and waterproof reliability.
Thanks to removable isolation links, operators enjoy easier installation and testing. PTE offers versions for both single‑core and coaxial cable bonding, with or without SVLs.
Design Features
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Compact IP‑67 enclosures (SS‑316, fiberglass, brass) suitable for indoor/outdoor or underground use
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Custom cable glands and lug sizes
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Compatible with IEEE, IEC 60529 (Ingress), IEC 60060‑1 (Insulation), IEC 60230 (Lightning Impulse), IEC 62271‑1 (Short‑Circuit) standards
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Included ZnO-based SVLs from Insulect (AK Power) to handle surge events
Choose PTE Link Boxes for superior reliability, proven compliance, and long-term performance in high-voltage underground cable systems.
