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Lightning Rod Protection Calculator

Science & Engineering

GB 50057 rolling sphere, hr = 30/45/60 m, radius at hx

Quick Answer

Lightning Rod Protection Calculator: GB 50057 rolling sphere, hr = 30/45/60 m, radius at hx. Lightning Rod Protection Calculator uses standard science & engineering formulas to compute accurate results instantly.

Rod & protected object

m
m
Protection radius at 2m24.32 m

Ground-level radius 39.69 m

Calculation (rolling sphere)

  1. 1Ground radius r₀ = √(h(2hr−h)) = √(15 × 105) = 39.69 m
  2. 2√(hx(2hr−hx)) = √(2 × 118) = 15.36 m
  3. 3rx = r₀ − 15.36 = 24.32 m
Per GB 50057-2010 rolling-sphere method: rx = √(h(2hr−h)) − √(hx(2hr−hx)) for h ≤ hr. Sphere radius hr = 30/45/60 m for class I/II/III buildings; a stricter class (smaller hr) shrinks the protected zone. Height beyond hr adds no protection. This is the single equal-height rod formula — multiple/unequal rods need the code graphic method. The zone means significantly reduced strike probability, not absolute protection; real design must follow the full code.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Lightning Rod Protection Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Lightning Rod Protection Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: GB 50057 rolling sphere, hr = 30/45/60 m, radius at hx.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Lightning Rod Protection Calculator formula

Lightning Rod Protection Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Lightning Rod Protection Calculator?
Open the page and fill in the input fields — results update automatically. GB 50057 rolling sphere, hr = 30/45/60 m, radius at hx.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Lightning Rod Protection Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/lightning-rod

Results provided by this tool are for reference only and do not constitute professional advice.