Quick Hits

QUICK HIT 08

How Many Sets of Service-Entrance Conductors Can You Run?

2026 NEC Reference: 230.40

🎯 What You'll Learn

The general rule limits what each service drop, set of overhead or underground service conductors, or service lateral can supply.

⚡ THE BASE RULE

Each service drop, set of overhead or underground service conductors, or service lateral generally supplies:

ONE set of service-entrance conductors.

But there are exceptions.

🏢 MULTI-OCCUPANCY

Multi-occupancy buildings can have arrangements where individual occupancies or occupancy groups receive their own set.

Where the number of service disconnects exceeds six, identification plaques are required at the appropriate locations.

🔌 OTHER EXCEPTIONS

Additional arrangements can apply to:

• Two through six grouped service disconnects

• One-family dwellings and accessory structures

• Multifamily/multi-occupancy buildings

• Certain supply-side-connected systems

🧠 EXAM-STYLE QUESTION

Can a single-family dwelling's service drop supply separate service-entrance conductor sets to both the house and a detached garage?

Answer: Yes.

The applicable exception permits this arrangement.

📌 QUICK TAKEAWAY

Don't automatically assume:

One service drop = one physical set of entrance conductors.

Always check the exceptions in 230.40.

➡️ Next Quick Hit: Insulation, sizing, and wiring methods.

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