Kentucky grid is split across three wholesale areas: Louisville Gas & Electric and Kentucky Utilities operate their own balancing authority, Kentucky Power belongs to PJM Interconnection, and other parts of the state fall under MISO. Facilities are also served by Duke Energy Kentucky and cooperatives supplied through East Kentucky Power Cooperative. Because the available fault current at a service depends on which utility and grid area you sit in, and it changes when that utility upgrades equipment, short-circuit and arc flash studies should be revisited after utility-side work.
Kentucky operates its own OSHA-approved state plan, Kentucky OSH, which covers both private-sector and public-sector employers. The Kentucky program adopts the federal electrical safety standards in 29 CFR 1910 Subpart S, which treat NFPA 70E as the consensus standard for arc flash risk assessment and equipment labeling. A current, PE-sealed arc flash study is the documentation a state inspector or an insurance auditor expects to see.
The authority having jurisdiction for the installation itself is typically the state or local electrical inspection office enforcing the National Electrical Code as adopted in Kentucky. Every study True Power Systems delivers in the Commonwealth is modeled to current IEEE and NFPA methodology and sealed by a Professional Engineer licensed in Kentucky.