- Product Detail
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■Product overview
Central Stainless Steel Tube OPGW (SSLT / Uni-Tube) is an overhead ground wire that combines lightning shielding + fault current return with an integrated fiber-optic communication path. Optical fibers are housed in a gel-filled stainless steel loose tube located at the center of the cable, while the surrounding metallic strands deliver the required mechanical strength and electrical performance for transmission lines.
■Typical construction (cross-section concept)
Core optical unit (center):
Stainless steel loose tube (sealed), filled with water-blocking gel
Optical fibers (single-mode types selectable)
Controlled fiber excess length for strain management (design-dependent)
Outer stranded layers (mechanical + electrical):
One or more layers of metallic strands, commonly:
Aluminum-clad steel wires (ACS)
Aluminum alloy wires (AA)
(Optional) other steel strands depending on project requirements
Notes on “Uni-Tube”:
“Uni-Tube” refers to the single central tube optical unit concept (as opposed to multi-tube stranded designs).
■Applications
New build or retrofit of overhead shield/earth wire position (top of tower)
Grid modernization: teleprotection, SCADA, dispatch communications, substation interconnects
■Standards & compliance (commonly referenced)
OPGW requirements are usually specified against a combination of the following:
IEEE 1138 – construction/performance and test requirements for OPGW used on utility power lines
IEC 60794-4-10 – family specification for aerial optical cables along electrical power lines (OPGW), including defined test frameworks (e.g., lightning test parameter definitions, MIT references, etc.)
Fiber and cable test methods are typically aligned with IEC 60793 / IEC 60794 series and fiber recommendations such as ITU-T G.652 / G.655 (project-specified).
■Technical data (project-specific; values depend on strand mix and design)
1.Representative design window (public reference examples)
The ranges below reflect representative central-tube OPGW designs shown in published product tables (examples vary by manufacturer and are not guaranteed values for a specific order).
Parameter Representative window* Notes Fiber count 24–144 Central stainless tube designs commonly cover this range in published examples. Overall diameter (OD) ≈ 11.8–16.8 mm OD varies with RTS/fault-current target and strand count. Weight ≈ 0.35–0.74 kg/m (≈ 350–740 kg/km) Converted from published lb/ft examples; final depends on wire mix/OD. Rated breaking strength (RBS) ≈ 45–108 kN Typical published examples fall in this band. Fault current rating (I²t) ≈ 43–186 kA²·s Typically stated as thermal short-circuit capacity index I²t. Total metallic cross-section ≈ 80–150 mm² Used for electrical/mechanical design trade-off. Max shipping length (per reel type) up to ~7,000 m Example published max ship length values (reel-dependent). 2.Optical configuration (selectable)
Fiber types (typical options):
ITU-T G.652 (SM), ITU-T G.655 (NZDSF), or other types per project requirement
Fiber safety & identification:
Fiber identification typically follows a standardized color/marking scheme (e.g., TIA/EIA color coding practices).
Optical performance:
Optical attenuation, dispersion, PMD, and bandwidth are defined by the selected fiber type and supplier’s fiber specification (values declared in the final datasheet).
3.Mechanical & electrical definitions (how specs are typically stated)
RBS / RTS: breaking strength of the completed OPGW (design target for sag-tension)
EDS: everyday stress used in line design (utility-specified)
Fault current rating (I²t, kA²·s): thermal short-circuit capacity index; coordinated with maximum permissible temperature rise and duration
Metal strand mix: ACS/AA ratio selected to balance conductivity, corrosion behavior, weight, and tensile strength
■Handling & installation guidance (general practice)
Final handling limits (pulling tension, sheave size, torsion control) should follow the project method statement and applicable standards. As a common industry practice, minimum bending radius is often specified as a multiple of cable OD, e.g., ~20×OD during installation in published OPGW cable datasheets.
Typical operating temperature ranges shown in published OPGW cable datasheets are often around -40°C to +70°C (project-dependent).
■Ordering information (what to specify for an accurate quotation)
To produce a guaranteed, buildable design, please specify:
Voltage level and installation environment (normal / coastal / industrial pollution)
Fiber count and fiber type (e.g., G.652, G.655, mixed)
Target OD / weight window (especially for shield-wire replacement projects)
Required RBS/RTS, span data, ice/wind loads (sag-tension design inputs)
Required fault current rating (I²t) and any lightning endurance requirements
Preferred reel type and maximum reel shipping length requirement
■Deliverables (typical)
Product drawing (cross-section + lay details)
Guaranteed technical datasheet (OD, weight, RBS/RTS, I²t, strand materials, fiber schedule)
Test reports per agreed standard/inspection plan (type test / routine test / acceptance test as specified)
Central Stainless Steel Tube OPGW (SSLT / Uni-Tube) – Optical Ground Wire Cable
Central Stainless Steel Tube OPGW (SSLT / Uni-Tube) is an overhead ground wire that combines lightning shielding + fault current return with an integrated fiber-optic communication path. Optical fibers are housed in a gel-filled stainless steel loose tube located at the center of the cable, while the surrounding metallic strands deliver the required mechanical strength and electrical performance for transmission lines.
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FAQ
How can I get a quotation?
Simply send us your inquiry with detailed specifications (product type, quantity, standards). Our sales team will provide a quotation within 24 hours.
Could I visit your factory?
Yes, we welcome and encourage factory visits. It provides an excellent opportunity for clients to gain firsthand insight into our production processes, technical capabilities, and quality control standards.
What payment methods do you accept?
We accept T/T, PayPal, and L/C at sight. Other options may be negotiable depending on the order.
How do you ship the products?
We support multiple shipping options: 1.Express (DHL, FedEx, UPS, TNT) for small orders; 2.Air freight or sea freight for bulk shipments; 3.EXW, FOB, CIF, and DDP terms are available.
What are your main export markets?
Our products are widely used in telecom operators, data centers, ISPs, and system integrators across Asia, Europe, North America, and the Middle East.
Do you provide technical support?
Yes. Our engineering team offers professional technical support, including product selection, network design advice, and troubleshooting assistance.
CONTACT US
Email: bynet@szbynet.com
Phone: +86 19925206282
Shenzhen Headquarter:
No. 45, North Dalang Road, Dalang Street, Longhua District, Shenzhen, Guangdong Province, China
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