This is a good question that highlights a common point of confusion when interpreting the NEC (National Electrical Code) regarding working clearances. Here's a breakdown of how to approach this scenario and a likely interpretation

Understanding the Intent of Working Space Requirements

The primary intent of NEC working space requirements (e.g., 110.26) is to provide sufficient space for qualified persons to safely inspect, operate, and maintain electrical equipment that is likely to require examination, adjustment, servicing, or maintenance while energized.Analyzing Your Situation Disconnect Handles on the Side

The fact that the disconnect handles are on the side is a key point. They are for operation (turning the switch on/off).

Access from the Front

The wiring connections and internal components of the disconnect switches are accessed from the front of the panel.

Likelihood of Work While Energized

This is the critical question. Is it likely that a qualified person will need to perform any maintenance or troubleshooting inside the disconnect switch enclosure while the power is on?

Likely Interpretation and Requirements

Given your description, here's how the NEC is likely to be interpreted:1. Working Space at the Front (Panel Face)

The front of the control panel (where access to the disconnect switch internals is located) absolutely requires the full working space clearances specified in NEC 110.26. This is because this is where the qualified person will be working on the electrical components. The depth of the working space depends on voltage to ground and other factors outlined in 110.26(A).
2.

Clearance at the Side (Disconnect Handles)

This is where it gets nuanced.

If the disconnect handles are solely for operating the switch (on/off) and there is no expectation of maintenance or troubleshooting at the handle location while energized, then the full 3'-6" working space is likely not required at the side. This is because the side isn't considered the primary working space for the equipment. However, there must still be sufficient clear space to operate the handles easily and safely. Think about a person wearing PPE being able to reach and manipulate the handle. Check for other codes requirements for this.

Key Considerations and Recommendations AHJ (Authority Having Jurisdiction)

The final interpretation rests with the AHJ.

Discuss this specific situation with your local electrical inspector or AHJ to get their definitive ruling. Document their decision in writing. They may have specific local interpretations or amendments to the NEC. Panel Layout and Serviceability

Even if the NEC technically allows less than the full working space at the side, consider these factors:

Accessibility

Ensure the handles are easily accessible. A crowded area around the handles could create a safety hazard.

Future Maintenance

Could future modifications or maintenance require working on the disconnect switch at the handle location? Plan for that possibility.

Labeling

Clearly label the disconnect switches with their purpose and the location of the access point for maintenance (i.e., "Disconnect for [Equipment]. Access to internal wiring via the front of the panel.").

Documentation

Keep detailed drawings and documentation that clearly show the layout, access points, and intended working space for the control panel.

Ergonomics

While not strictly a code requirement, consider the ergonomics of operating the handles. Are they at a comfortable height and reach? Can they be operated easily with gloved hands?

Risk Assessment

Perform a risk assessment to identify any potential hazards associated with operating and maintaining the disconnect switches. This assessment can help you determine if additional clearances or safety measures are needed.

In summary: You likely only need working clearance at the front of the panel. You still need adequate space to operate the handles on the side. Always* consult with your AHJ for a definitive ruling. Flag for review