A cross arm electric pole is an angle iron fixed horizontally at the top of a utility pole, fitted with porcelain insulators, used to support overhead power lines. It is a crucial component of elevated power lines, its function being to install and fix insulators and other electrical fittings on the tower, supporting conductors and lightning protection wires, and maintaining a safe distance from the line as required.
Product Parameters
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Main material |
Q235B / Q355B structural steel (or other steel grades conforming to national/international standards) |
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Surface treatment |
Hot-dip galvanizing (zinc layer thickness ≥ 86μm, conforming to ISO 1461 / GB/T 13912 standards) |
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Common lengths |
6m, 8m, 9m, 10m, 12m (customizable according to project requirements) |
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Common number of crossarms |
Single crossarm, double crossarm, triple crossarm ("pi" type, "upper" type, etc.) |
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Applicable voltage levels |
10kV, 35kV, 66kV, 110kV (determined based on design load) |
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Design load |
Customized according to engineering requirements (usually including wind load, conductor tension, ice load, etc.) |
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Connection method |
Flange connection, plug-in connection (requires a matching base) |
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Corrosion protection lifespan |
In a galvanized environment, the lifespan is typically ≥ 30 years (depending on the specific environment). |
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Implementation standards |
GB/T 2694 (Standard for the manufacture of power transmission line towers), IEC 60652 (Standard for load testing), etc. |
Product Specifications
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40mm×40mm×5mm |
Suitable for single-phase overhead lines. |
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50mm×50mm×6mm |
Suitable for three-phase four-wire overhead lines with a conductor cross-sectional area of 50mm² or less. |
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56mm×56mm×5mm 63mm×63mm×6mm |
These are the two most commonly used specifications for 10kV overhead lines. |
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65mm×65mm×8mm |
Suitable for three-phase four-wire overhead lines with a conductor cross-sectional area of 50mm² or more. |
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75mm×75mm×8mm |
This larger specification of angle steel is used to provide stronger load-bearing capacity when erecting long-span lines, double-circuit lines, or installing heavier switchgear. |
Product Feature
Load Bearing and Support
Insulated at the top of the pole, it supports the overhead conductors via insulators, bearing the weight of the wires and external loads (such as wind loads and icing loads), ensuring stable conductor installation.
Maintaining the distance between conductors ensures safe spacing of the line, preventing short circuits or interference.
Stability and Protection
Reducing conductor vibration amplitude prevents breakage due to long-term fatigue, extending the service life of the wires.
Some types (such as porcelain crossarms and composite material crossarms) also have insulation functions, improving the line's resistance to lightning strikes and flashover protection.
Production Details
Length Adaptability
The design should be based on the number of overhead lines, span, and pole type to ensure that the conductor spacing meets safety standards.
Matching Fittings
Crossarms must be fixed to the pole/tower using crossarm clamps (U-shaped structure, made of galvanized steel, stainless steel, or composite materials). These clamps should be corrosion-resistant, slip-resistant, and compatible with poles from 80-300mm in diameter, capable of withstanding a 500kg static load and winds up to force 8.
Standardization and Cost
Composite material crossarms have a comparable overall cost to traditional angle iron crossarms, but lower maintenance costs over their 30-year lifespan, offering superior cost-effectiveness
Our Service
Quality Traceability System
Utilizing laser marking and blockchain technology, this system enables end-to-end traceability from raw materials to finished products, reducing customer complaint handling time to 2 hours .
01
Warehousing and Logistics Support
Leveraging our global network and localized distribution capabilities, we provide overseas customers with flexible international transportation solutions, supporting various methods including sea freight, air freight, and cross-border land transport. We also assist with export customs clearance and documentation processing to ensure the safe and compliant delivery of goods.
02
Environmentally Friendly Production Standards
ISO14001 certified, employs zero-discharge technology for electroplating wastewater, reduces unit product energy consumption by 28%, and has been recognized as a provincial-level green factory.
03
Customer Tiered Service System
Establishes exclusive files for VIP customers, providing annual quality reports and regular inspection services. The repurchase rate for major customers reaches 89% .
04
FAQ
Q: Is the connection between the horizontal arm and the vertical post secure?
A: The connection structure is optimized for stress distribution and secured with fasteners, ensuring long-term stability and resistance to loosening.
Q: Is the horizontal arm prone to deformation under prolonged stress?
A: The structural strength is designed to withstand long-term loads, and significant deformation is unlikely under normal operating conditions.
Q: Is the hole position accuracy guaranteed?
A: The hole position machining accuracy is controlled, ensuring consistent dimensions for easy on-site assembly and alignment.
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