Photo Source: Summerhill

Ensure That:

• A Layer of drywall is installed either under or over the plywood prior to installing the electrical panel, to provide the required fire rating (or fire protection coating is applied)
• Electrical panel is secured to plywood/osb backing
• All wiring leading to the panel comes through the plywood or drywall backing

(These are suggested best practices. Check local building code for requirements in your area.)