Periodic inspection of wire insulation should be made according to which document?

Periodic inspection of wire insulation should be made according to the MRC (Manufacturers' Recommended Practices). The MRC provides specific guidelines and standards put forth by manufacturers regarding the handling, installation, and maintenance of electrical wiring and insulation materials. This ensures that the electric systems are efficient, safe, and compliant with industry standards set forth by manufacturers.

While ISO Standards establish broad quality and safety standards applicable globally, they do not focus specifically on wire insulation and its periodic inspection. NEC Guidelines provide essential codes for electrical installations and safety, but they may not detail the specific practices for inspection frequency and methods. OSHA Regulations primarily focus on workplace safety as a whole and do not directly cover the specifics of wire insulation maintenance. This makes the MRC the most appropriate choice for ensuring that inspections and practices are tailored directly to the materials and methods recommended by the manufacturers themselves.