ISO 1461 Certified 33kV Slip-Joint Transmission Steel Electric Pole 15m Q420B Anti-Corrosion
ISO 1461 Certified 33kV Slip-Joint Transmission Steel Electric Pole
Product Overview
The ESP-33kV-15M-SJ is a heavy-duty transmission steel pole purpose-built for 33kV sub-transmission networks. Constructed from Q420B high-tensile steel (yield strength ≥420 MPa) and protected by ISO 1461 hot-dip galvanization with ≥100μm zinc thickness, this 15-meter pole provides exceptional load-bearing capacity for long-span and multi-circuit configurations.
Key Features
- Q420B High-Tensile Steel: 420 MPa minimum yield strength allows longer spans with fewer intermediate poles, reducing total project cost
- ISO 1461 Galvanization (≥100μm): Superior zinc coating thickness exceeding ASTM A123 minimums, certified for C4 (high-corrosivity) environments
- Slip-Joint Quick Assembly: Engineered overlap connections eliminate on-site welding; each section nests securely with guided alignment
- Multi-Circuit Ready: Pre-engineered for double-circuit and single-circuit configurations with factory-welded arm attachment points
- Seismic Resistant Design: Compliant with IEC 60826 loading criteria for wind zones up to 180 km/h and seismic zone IV
Technical Specifications
| Parameter | Value |
| Rated Voltage | 33kV |
| Pole Height | 15m (embedment 2.2m) |
| Material Grade | Q420B (equivalent S420MC) |
| Top/Bottom Diameter | 220mm / 480mm |
| Wall Thickness | 5mm-10mm (tapered) |
| Design Standard | IEC 60826 / ASCE 48-11 |
Applications
Designed for 33kV overhead sub-transmission lines, grid interconnection projects, industrial feeder lines, wind farm collector circuits, and mining site power distribution where high mechanical strength and corrosion resistance are critical.
Quality Assurance
Rigorous QA protocol includes: 100% automated submerged arc welding (SAW) with UT inspection, dimensional compliance per GB/T 2694-2018, zinc coating uniformity testing per ISO 1461, base plate flatness within 0.5mm, and full MTR (Material Test Report) documentation with each shipment.
Customization Options
Available in heights from 12m to 24m, single or double circuit configurations, custom cross-arm mounting patterns, step bolts and climbing devices, aviation warning paint, and anti-climbing guards. Engineering design review included for orders over 10 tons.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.