Accessible (As Applied to Equipment) : Admitting close approach: not guarded by locked doors, elevation, or other effective means. (NFPA 70 National Electrical Code)
NFPA 79 Electrical Standard for Industrial Machinery, 2002 ed. http://www.nfpa.org/assets/files/AboutTheCodes/79/ 79-A2002-rop.pdf, (Electr Std for Ind Machinery - Amer) {225 NFC}