Exceptions to 408.3(B)

The prohibition against locating subpanels in attics applies to: Finished attics

These are considered habitable spaces.

Unfinished attics

These are not considered habitable spaces, but the temperature can rise above permissible limits.

Your Situation

Since the attic is being used as a landing/workspace, it is likely considered an unfinished attic. However, it's important to address the following: Temperature Considerations

The attic should be well-ventilated and have a temperature that does not exceed 40°C (104°F). This can be achieved through proper ventilation or air conditioning.

Accessibility

The panelboard should be readily accessible for inspection and maintenance. The door leading to the landing/workspace should provide clear access to the panelboard.

Induction and Overheating

Check that the panelboard and its components are rated for the ambient temperature in the attic. Ensure proper spacing and ventilation around the panelboard to prevent overheating.

NEC Compliance

Consult the latest edition of the National Electrical Code (NEC) for any specific requirements or clarifications regarding subpanel location in attics.

Additional Considerations Local Building Codes

Check with your local building code authority for any additional requirements or restrictions.

Manufacturer's Instructions: Refer to the manufacturer's instructions for the specific panelboard being installed to ensure proper installation and safety guidelines.If all these considerations are met, there should be no prohibition against locating a subpanel in the attic. However, it's recommended to have the electrician consult with the local building code authority to confirm compliance and obtain any necessary permits. Flag for review