Buy Perforated Cable Tray Joint Plate Supplier & Suppliers

A standard flat joint plate (often called a fishplate or splice washer) sits flush against the inner or outer vertical sidewall of the perforated cable tray and is secured via bolts through the pre-punched hole pattern. A wrap-around coupler (or U-shaped base connector) encloses both the sidewall flange and the bottom floor of the tray. Wrap-around couplers are strongly recommended for heavy-duty series trays (widths ≥ 300mm and depths ≥ 100mm) because they provide bidirectional shear stiffness and prevent tray base sagging under extreme copper cable bundle loading.

Yes. When installed using our serrated under-head carriage bolts and serrated flanged nuts, our joint plates bite through the passivation or paint layer, achieving electrical bond resistance well beneath the 50 mΩ ceiling dictated by IEC 61537 and BS EN 61537 standards. For powder-coated containment runs, we provide dedicated copper bonding jumper kits with pre-crimped ring lugs to ensure compliance without requiring manual on-site scraping.

A standard connection requires two vertical joint plates (one for each sidewall). For tray depths of 50mm, 4 bolts per pair (2 bolts per plate) are typical. For depths of 100mm and 150mm, 8 bolts per pair (4 bolts per plate) are standard. For trays wider than 300mm, engineering best practices require an additional bottom splice bar secured across the floor perforation to distribute torsional loading evenly.

Absolutely. Operating 12 assembly lines and over 60 heavy-duty punch presses in Songjiang, Shanghai, we routinely produce custom offset joint plates, vertical adjustable pivot couplers (-90° to +90° for riser transitions), and horizontal tee/cross connectors customized to proprietary architectural constraints. We can tailor hole dimensions, pitch centers, and plate gauges within 48 hours from engineering drawings.

Pre-galvanized (PG) steel is cold-formed from pre-coated coil with a typical zinc coating of 12-20 μm, suitable solely for dry indoor HVAC-conditioned spaces. Hot-Dip Galvanized (HDG) joint plates are fabricated and punched from raw structural steel (Q235B) and subsequently immersed in molten zinc at 450°C, yielding a heavy, self-healing zinc-iron alloy barrier of 65-85+ μm. Outdoor, coastal, or humid installations must always use HDG or stainless steel to prevent rust creep at punched hole edges.

Shanghai Qiongkai produces over 50,000 meters of cable tray and matching couplers monthly across 30,000 m² of factory space. Standard inventory joint plates have an MOQ of 500 units (or consolidated with tray container shipments). Standard lead time is 7 to 14 days for standard galvanized profiles, with accelerated dispatch available through Shanghai Yangshan or Waigaoqiao ports.