Quick Hits

QUICK HIT 04

Overhead Service Conductors — Insulation, Sizing & Above the Roof

2026 NEC References: 230.22, 230.23, 230.24(A)

🎯 What You'll Learn

Part II of Article 230 starts with overhead service conductors.

⚡ INSULATION

Individual overhead service conductors must generally be insulated or covered.

An exception applies to a bare grounded conductor within a multiconductor cable.

📏 MINIMUM SIZE

The general minimum size is:

8 AWG copper

or

6 AWG aluminum

A smaller conductor can be permitted when the service supplies only a single branch circuit under the specified conditions.

🏠 ABOVE THE ROOF

Standard overhead service conductors require:

8 ft 6 in. vertical clearance

with the required clearance maintained around the roof edge.

There are exceptions involving specific roof configurations, pedestrian and vehicle areas, low-voltage situations, short overhangs, final spans, and guarded or isolated areas.

🧠 EXAM-STYLE QUESTION

What's the minimum vertical clearance for overhead service conductors above a standard roof?

Answer: 8 ft 6 in. (2.6 m).

The required clearance around the roof edge also has to be maintained.

📌 QUICK TAKEAWAY

Overhead service conductors aren't simply:

"Put them above the roof."

You need to know the clearance rules and their exceptions.

➡️ Next Quick Hit: Ground-level clearance.

← View Chapter 2 Home

← Back To Article 210 Home

← Back To Quick Hits Home