According to NETA, for low voltage cables a visual inspection must verify that:

The correct answer isCbecause the API guide repeatedly emphasizes that source inspection and surveillance of electrical equipment must verify installed wiring and connections against the governing project drawings. In the guide’s inspection activities, items such as“One-line Wiring Diagram Review”and confirmation that components conform to drawings and specifications are specifically identified as part of the inspection checklist. For electrical equipment inspections more broadly, the guide also requires inspectors to compare equipment and circuitry with drawings and verify that electrical details conform to those drawings.

The other options are weaker. The guide discusses low-voltage cable identification and notes that NEC mandates only certain conductor colors for neutral and protective grounding, not a blanket requirement that color codes must comply with IEEE. Also, cable shields are discussed in the context ofMV/HV cable constructionthrough conductor screens and shielding-related design features, not as a universal low-voltage visual inspection criterion. Finally, the guide does not require all terminations to use ring tongue lugs. Therefore, verifying that cableconnections match the single-line diagramis the best verified answer.