The National Electrical Code (NEC) dictates the requirements for emergency disconnects. Here's a breakdown of how it applies to your situation

Key Considerations:
Purpose of the Emergency Disconnect

The purpose of the outside disconnect is to provide a readily accessible means to shut off all power to the dwelling in an emergency situation, such as a fire.

Code Reference

The relevant section is generally

NEC 230.85 (Emergency Disconnects). Note that local jurisdictions can amend the NEC, so check with your local authority having jurisdiction (AHJ) for specific requirements. General Requirements Must be readily accessible outside the building. Must be clearly labeled as an emergency disconnect. Disconnecting all ungrounded conductors, meaning it must shut off all "hot" wires supplying the building. For one- and two-family dwellings, must be installed in a readily accessible location either outside of the building or inside nearest the point of entrance of the service conductors.Distance

The NEC itself

does not specify a precise distance from the panel. Instead, it focuses on readily accessible and nearest the point of entrance. Readily Accessible

"Readily accessible" means capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, and so forth. (NEC Article 100 Definitions).

Nearest the Point of Entrance

This means the disconnect should be located as close as possible to where the service conductors enter the building. It's often right next to or immediately inside the wall where the service entrance cable comes in.

MLO Panel without a Main Breaker and the Emergency Disconnect

Since you have a 40-space MLO (Main Lug Only) panel without a main breaker, the emergency disconnect outside becomes even more critical. The outside disconnect essentially acts as the main disconnect for the entire panel. Placement is usually dictated by the utility company's service drop location and the location of the meter.

Common Scenarios and Considerations


Meter on the Outside Wall, Panel in the Basement

If the meter is on the outside wall and the panel is in the basement just inside that wall, the emergency disconnect should ideally be located right next to the meter on the outside of the building. This places it nearest the point of entry of the service conductors.2.

Long Distance from Meter to Panel

If the panel is a significant distance from the meter location, consult with your local inspector. They may allow the emergency disconnect to be located closer to the panel in the basement, even though it's not exactly at the point of entry. But this is less common.3.

Local Amendments

Local codes might have specific distance limitations or placement requirements for emergency disconnects.

Therefore, the best course of action is


Consult Your Local Electrical Inspector

This is the most important step. Discuss your specific situation with the local inspector before* starting any work. They can provide guidance based on local code interpretations and requirements.2.

Consider the Utility Company

In many areas, the utility company also has requirements for the placement of disconnects and metering equipment. Check with them as well.3.

Prioritize Safety and Accessibility

Even without a precise distance rule, the goal is to provide a readily accessible, easy-to-locate disconnect that can quickly shut off power in an emergency.

In summary, while there's no single distance number, the key factors are "readily accessible," "nearest the point of entrance," and compliance with local codes. Consulting your local electrical inspector is essential to ensure your installation meets all requirements. Flag for review