Line Fittings | JBB Series Bolted Parallel Groove Clamp for Overhead Power Lines

YAOGU JBB Series Transition Parallel Groove Clamp is a stepped / transition parallel groove clamp engineered with two differently sized parallel grooves to reliably connect main distribution conductors to smaller tap-off or service drop conductors. Engineered for rigorous utility and industrial transmission and distribution systems, this fitting delivers superior electrical conductivity, robust mechanical holding force, and long-term resistance to atmospheric weathering.

Manufactured from premium-grade materials and precision-machined conductor grooves, each clamp guarantees low contact resistance, excellent current distribution, and sustained clamping pressure under cyclic thermal loading and vibration.

Industry Approvals & Compliance Standards:

• GB/T 2314: General Technical Requirements for Electric Power Fittings
• DL/T 758: Splicing and Connection Fittings for Overhead Power Lines
• IEC 61284: Overhead Lines – Requirements and Tests for Fittings
• ISO 9001:2015: Certified Quality Management System
• ISO 1461 / ASTM A153: Hot-Dip Galvanizing Specification for Fasteners