1. Mechanical and electrical continuity: The MC cables have been stripped of their outer metallic sheath where they entered the 3-1/2? conduit attached to the panel. This converted one wiring method (MC cable) to a different wiring method (single conductor building wiring) without the proper transition. It is my interpretation of the code that these cables have to be properly terminated before changing wiring methods. For reference : NEC 300.10 ? (Electrical Continuity) ?Metal raceways, cable armor, and other metal enclosures for conductors shall be metallically joined together into a continuous electrical conductor and shall be connected to all boxes, fittings , and cabinets so as to provide effective electrical continuity. Unless specifically permitted elsewhere in the NEC, raceways and cable assemblies shall be mechanically secured to boxes, fittings, cabinets and other enclosures.? Also NEC 300.12 ? (Mechanical Continuity) ?Metal or nonmetallic raceways, cable armors, and cable sheaths shall be continuous between cabinets, boxes, fittings, or other enclosures or outlets.? It is my interpretation of the code that these cables have to be properly terminated on both ends in order to comply with these Code requirements.
2. Building wiring (the wiring method converted to by stripping the metallic sheath from the MC cable) can only be installed in cable tray in industrial installations and only in sizes 1/0 AWG and larger. To allow the stripped MC cables to be installed in cable tray would be a code violation.
