Quick Hits

QUICK HIT 16

Supply-Side Equipment & Overcurrent Protection

2026 NEC References: 230.82, 230.90–230.95

🎯 What You'll Learn

The final section of our Article 230 series looks at what can be connected on the supply side of the service disconnect and the service overcurrent protection requirements.

⚡ SUPPLY-SIDE EQUIPMENT

Only specifically permitted equipment can be connected on the supply side of the service disconnect.

Examples include:

• Cable limiters

• Meters and meter sockets

• Properly rated meter disconnect switches

• Meter-mounted transfer switches

• Instrument transformers

• Impedance shunts

• Load-management equipment

• Splice/tap devices

• Surge arresters and SPDs

• Permanently mounted absence-of-voltage testers

• Certain control/protection circuits

Each item has its own conditions.

🔥 SERVICE OVERCURRENT PROTECTION

Each ungrounded service conductor requires overload protection based on its ampacity, with the applicable allowances for motor starting, standard OCPD sizing rules, and the permitted arrangements involving multiple OCPDs.

An OCPD generally isn't installed in the grounded conductor unless it is part of a breaker arrangement that opens all conductors simultaneously.

⚠️ GROUND-FAULT PROTECTION OF EQUIPMENT

GFPE is required under the specified conditions for certain solidly grounded wye systems and solidly grounded DC systems.

For a qualifying service, the service disconnect rating is:

1000 amperes or more

The source material also identifies the applicable voltage ranges, maximum setting, time-delay limitations, and initial performance-testing requirements.

🧠 EXAM-STYLE QUESTION

At what service disconnect rating does ground-fault protection of equipment become required on a qualifying solidly grounded wye system?

Answer: 1000 amperes or more.

🏁 ARTICLE 230 COMPLETE

You've made it through Services.

We covered:

230.1 — Scope

230.2 — Number of Services

230.4 — Service-Entrance Conductors

230.5–230.10 — Service conductors and building entry

230.22–230.29 — Overhead services

230.30–230.33 — Underground services

230.40–230.44 — Service-entrance conductors

230.46–230.54 — Connections, protection, support & entry

230.62–230.68 — Service equipment

230.70–230.81 — Disconnecting means

230.82 — Supply-side connections

230.90–230.95 — Service overcurrent protection and ground-fault protection

⚡ JOSHTHESPARKY TAKEAWAY

Don't just memorize Article 230.

Learn how the pieces connect:

Service → Conductors → Equipment → Disconnect → Protection

Then go back into the actual NEC and verify the details.

📖 Keep studying. Keep building. Keep learning.

Confirm everything.

➡️ Next Chapter 2 Quick Hit Series: Article 235

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