---
title: Site Conditions for a 71 m 500 kV Tangent Tower: Wind, Ice, Span and Ground
tags:  #500kv #tangent-tower #site-conditions #power-tower #lattice  
author: [SOLARTODO LIMITED](https://image.docswell.com/user/solartodo)
site: [Docswell](https://www.docswell.com/)
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description: SOLARTODO LIMITED 71 m 500 kV heavy lattice tangent tower: 497 m span, 4-bundle conductors, Class B wind and 15 mm ice, grounding below 10 ohm (4 ohm in high-lightning areas).
published: November 02, 26
canonical: https://image.docswell.com/s/solartodo/57N8L6-site-conditions-71m-500kv-tangent-tower
---
# Page. 1

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SOLARTODO LIMITED | POWER TOWER | SITE CONDITIONS
Site Conditions for a 71 m 500 kV Tangent Tower: Wind, Ice, Span
and Ground
A 500 kV line moves bulk power — the reference page cites typical corridors of 1,000-1,500 MW — so a weak assumption at one tower can affect
an entire grid region. SOLARTODO LIMITED's 71 m heavy lattice tangent tower is designed for 500 kV single-circuit lines with a 497 m design
span.
EN-PT-C18
|
flanged Q420 lattice
|
tangent (suspension) only
What an EPC team should confirm before adopting the tower unchanged.


# Page. 2

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01
THE STRUCTURE
71 m heavy galvanized lattice tangent
tower
Carries a 500 kV line across open plains. Heavy galvanized
Q420 steel lattice, about 54 t, flanged connections.
Electrical: 4 bundled ACSR conductors per phase and 12
composite suspension insulator strings.
Design life is 50 years with inspection and coating maintenance. Foundation is about 62 m3 of concrete per tower. This is a tangent (suspension) structure for straight
sections, not an angle point.
SOLARTODO LIMITED | 71 m 500 kV tangent tower | 2/6


# Page. 3

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02
DESIGN BASIS
Height
71 m, heavy galvanized Q420 steel lattice (about 54 t), flanged.
Electrical
500 kV single circuit, 4 bundled ACSR conductors per phase, 12 composite suspension insulator strings.
Span
497 m design span. About 12-18% fewer towers than shorter-span layouts, with tighter sag, clearance and conductor-temperature checks (IEEE
738).
Loading
Class B wind and 15 mm ice, aligned with IEC 60826 / GB 50545.
Grounding
Below 10 ohm standard; below 4 ohm at high-lightning sites.
Foundation
About 62 m3 concrete per tower. Rocky or soft ground changes the foundation type.
Design life
50 years with inspection and coating maintenance. Supply: installed, commissioned, 1-year warranty.
SOLARTODO LIMITED | 71 m 500 kV tangent tower | 3/6


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03
DESIGN-BASIS TABLE
Confirm these figures against the corridor
Span, wind and ice, grounding and foundation are a design basis, not a
substitute for a site-specific study. Mountain passes, coastal plains and cold
plateaus need local meteorological data before the tower is accepted
unchanged.
SOLARTODO LIMITED | 71 m 500 kV tangent tower | 4/6


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04
FOUR SITE CONDITIONS
Wind and ice
Span length
The Class B / 15 mm ice basis suits many inland corridors. Mountain passes,
coastal plains and cold plateaus need local meteorological data before the tower
is accepted unchanged.
The 497 m span reduces tower count by about 12-18% versus shorter-span
layouts, but it raises the importance of sag, clearance and conductor
temperature checks (IEEE 738).
Lightning exposure
Ground and access
Where ground flash density is high, the grounding target tightens from 10 ohm
to 4 ohm, which may mean extra counterpoise or deeper rods.
62 m3 of concrete per tower and 54 t of steel require an access plan for every
location. Rocky or soft ground changes the foundation type.
SOLARTODO LIMITED | 71 m 500 kV tangent tower | 5/6


# Page. 6

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05
FAQ AND WHERE TO READ THE SPEC
FAQ
Which codes are referenced?
IEC 60826, GB 50545, ASCE 10-15, IEEE 738 and ISO 1461 for galvanizing.
Suitable for angle points?
No. It is a tangent (suspension) structure for straight sections.
What does supply include?
Installed, commissioned, and a 1-year warranty.
Product page
https://solartodo.com/products/power-tower/power-tower-71m-500kv-heavy-lattice-tangent-tower-flanged-2026-07-12
Enquiries: WhatsApp +1 737 395 2103. SOLARTODO LIMITED, No.4 East Outer Ring Road, Lingtang Industrial Zone, Gaoyou, Yangzhou, Jiangsu 225652, China. Founded 2014. ISO 9001:2015, ISO 14001:2015, ISO
45001:2018. https://solartodo.com
SOLARTODO LIMITED | 71 m 500 kV tangent tower | 6/6