BICSI Copper Practice Test

Inside a building, the NEC requires cables to be listed for their intended use by a recognized testing laboratory. Listing means the cable has been evaluated and approved for the specific interior environment (walls, ceilings, or conduit) and for the voltage and conditions it will encounter. This certification covers safety aspects like insulation, flame performance, and overall construction, ensuring the installation is compliant and safe. Using cables that aren’t listed would not meet code requirements, even though shielding or unshielded designs themselves can be appropriate or inappropriate depending on the situation. The important point is that the cable itself has to be listed for indoor wiring.