This situation is governed by the National Electrical Code (NEC) and potentially local codes. Here's a breakdown of how the NEC addresses accessibility and working space around electrical equipment, and how it applies to your situation

NEC Considerations:
110.26(A) Working Space

The NEC mandates adequate working space around electrical equipment that is likely to require examination, adjustment, servicing, or maintenance while energized. This space is defined in terms of depth, width, and height. This is the MOST IMPORTANT code here.

110.26(A)(3) Headroom

The working space must have a minimum headroom clearance of 6.5 feet (2 meters) or the height of the equipment, whichever is greater.

110.26(E) Access and Entrance to Working Space

This section deals with the means of getting to the required working space. This is the MOST RELEVANT code here.

(1) Minimum Size of Entrance

Addresses doorway sizes if there's a door to the room.

(2) Large Equipment

For equipment rated 1200 amps or more and over 6 feet wide, at least one entrance must be at least 24 inches wide and 6.5 feet high.

(3) Personnel Doors

If personnel doors are used for entrance to the working space, the door shall open in the direction of egress and be equipped with panic hardware if the door is used as a means of egress.

Readily Accessible (Definition)

NEC defines "readily accessible" as "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."

Applying the Code to Your Scenario


Working Space is Paramount

First and foremost, even with a disconnect, there must be adequate working space around the equipment when it's installed. This means at least 6.5 feet of headroom and the required depth and width clearances. If there's not adequate working space on the platform, the location is not code-compliant.2.

Accessibility for Disconnects

The Code requires that any required disconnects be "readily accessible". If the platform is 11 feet high and there's no permanent means of access, the disconnect is not readily accessible. Using a portable ladder is specifically prohibited by the definition of readily accessible.3.

Subpanel vs. Disconnect

The need for a fixed ladder or stairs is triggered by the need to make the equipment (disconnects or subpanel) "readily accessible" if the NEC requires ready access to it and if that equipment is located in a space requiring working clearances. If only a disconnect is required to be readily accessible, and the disconnect is at an elevation of 11 feet without a permanent ladder or stairs, the disconnect is not readily accessible per code definition, and you need to provide a permanent means of access. If you install a subpanel, you have the same requirement. The subpanel needs to be readily accessible.4.

Enforcement

The local electrical inspector has the final say in interpreting and enforcing the NEC.

Recommendations



Install a Fixed Ladder or Stairs

This is the safest and most reliable way to ensure compliance with the NEC and make the equipment readily accessible for maintenance and emergencies.

Relocate the Equipment

If possible, consider moving the equipment to a location that is readily accessible from ground level. This eliminates the need for a ladder or stairs.

Consult with an Electrical Contractor

It's always best to consult with a licensed electrical contractor to ensure that your installation complies with all applicable codes and regulations. They can assess the specific requirements of your project and recommend the best course of action.

Contact Your Local Electrical Inspector

Discuss your plans with your local electrical inspector before* starting the installation. They can provide guidance on local code requirements and ensure that your project will pass inspection.

In conclusion, an 11-foot platform without fixed access will likely violate the "readily accessible" requirement for disconnects (and definitely for a subpanel). You will almost certainly need to install a fixed ladder or stairs to comply with the NEC.

Disclaimer: I am an AI chatbot and cannot provide electrical advice. Consult with a qualified electrician for all electrical work. Flag for review