Quick Hits

QUICK HIT 15

Grouping, Operation & Rating the Disconnect

2026 NEC References: 230.72, 230.74–230.81

🎯 What You'll Learn

Having multiple service disconnects isn't the end of the requirements.

They also have to be properly grouped, identified, operated, and rated.

📍 GROUPING

The permitted service disconnects generally have to be grouped.

Each disconnect needs identification for the load it serves.

Specific fire-pump and emergency/standby arrangements have additional requirements.

⚡ OPERATION

Each disconnect has to open the ungrounded conductors simultaneously.

Where the grounded conductor isn't disconnected by the service disconnect, the applicable separate terminal or bus arrangement is required.

Disconnects can be manually or power operated under the applicable conditions.

Power-operated disconnects must still be capable of being manually opened during a power failure.

📏 MINIMUM RATINGS

The source material identifies these minimum ratings:

15A — single branch circuit

30A — up to two 2-wire circuits

100A — one-family dwelling

60A — other installations

Where multiple disconnects share the load, their combined rating has to meet the applicable minimum.

🚫 NO SOLDER

Connections to the disconnect use approved pressure connectors, clamps, or similar means.

Solder isn't the connection method.

🧠 EXAM-STYLE QUESTION

What's the minimum service disconnect rating for a one-family dwelling?

Answer: 100 amperes.

📌 QUICK TAKEAWAY

A service disconnect has to be:

Located correctly.
Grouped correctly.
Identified correctly.
Rated correctly.
Capable of proper operation.

➡️ Next Quick Hit: Supply-side equipment and overcurrent protection.

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