Quick Hits

🗓️ May 31st, 2026
⚡ SPARKY BREAKDOWN — NEC 225 SERIES (PART 4)

CLEARANCES ⚡
NEC 225.18–225.19
joshthesparky4 · Josh The Sparky

⚡ OPENING HOOK

Memorize these... or fail. ⚠️

Clearance questions show up everywhere.

Exams.
Inspections.
Field installations.

And unlike some code sections, these are numbers you simply have to know.

🧠 CORE IDEA

⚡ Minimum clearances exist to protect people, vehicles, buildings, and property from energized conductors.

These distances aren't recommendations.

They're mandatory safety requirements designed to prevent accidental contact and maintain safe working space around overhead conductors.

The higher the risk of contact...

The greater the required clearance.

⚡ CODE CONNECTION

225.18 — Clearance Above Ground

Outside conductors must maintain minimum clearances based on the area below.

Common values include:

⚡ 10 ft → Pedestrian-only areas

⚡ 12 ft → Residential property and driveways not subject to truck traffic

⚡ 18 ft → Public streets, roads, alleys, and areas subject to truck traffic

⚡ 24.5 ft → Railroad tracks

These clearances help protect both the public and vehicles passing beneath overhead conductors.

225.19 — Clearance From Buildings

Outside conductors must also maintain required separation from buildings and accessible openings.

Common requirements include:

⚡ 3 ft from windows, doors, porches, balconies, ladders, and similar openings

⚡ 8 ft 6 in above roofs under typical conditions

These requirements reduce the chance of accidental contact during normal building use and maintenance activities.

⚡ MEMORY TIP

Think of clearances as increasing with exposure:

⚡ People walking = 10 ft

⚡ Vehicles driving = 12 ft

⚡ Trucks and traffic = 18 ft

⚡ Trains = 24.5 ft

The greater the hazard below, the greater the required clearance above.

⚡ THE 3 GOLDEN RULES OF CLEARANCES

Know the Numbers

Many Article 225 questions come down to remembering specific clearance values.

Protect Accessible Areas

Windows, doors, balconies, and roofs all create opportunities for accidental contact.

Never Guess Distances

A few feet can mean the difference between compliance and a serious violation.

⚠️ BIG MISCONCEPTION

"If it's overhead, it's probably high enough."

Wrong.

The NEC doesn't use estimates.

It establishes minimum clearances based on exactly what's below and around the conductors.

🔥 WHY IT MATTERS

⚡ Public Safety

Proper clearances reduce accidental contact with energized conductors.

⚡ Vehicle Protection

Overhead conductors must remain safely above traffic and equipment.

⚡ Building Safety

Required spacing protects occupants, maintenance personnel, and first responders.

⚡ Exam Success

Article 225 clearance questions are some of the most commonly tested NEC concepts.

📌 CORE TAKEAWAY

⚡ Clearance requirements protect people, vehicles, and structures.
⚡ NEC 225.18 and 225.19 contain critical exam numbers.
⚡ These values aren't suggestions—they're mandatory safety requirements.

⚡ FINAL LINE

A conductor doesn't have to touch someone to be dangerous.

That's why the NEC requires enough distance to keep contact from happening in the first place. ⚡

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