Which statement describes the acceptability of using bare wire, cable, and busbars for circuit conductor installations?

• A. Bare wire, cable, and busbars are not an acceptable installation
• B. Bare wire, cable, and busbars are acceptable
• C. Bare wire is acceptable but cable and busbars are not
• D. Only busbars are acceptable

Answer: (A)

The main idea is safety through insulation: conductors that carry a circuit must be protected so people and other conductors can’t be accidentally energized or shorted. Bare wire, bare cable, and bare busbars expose live conductors directly, creating a high risk of shock, arcing, and accidental contact. In typical circuit installations, these conductors must be insulated or enclosed in a protective, nonconductive barrier. Busbars are usually used inside equipment or panels and are either insulated or enclosed to prevent exposure; bare sections would violate safety standards.

Because of that, none of these bare forms are acceptable for standard circuit conductor installations. The statement that any of them is acceptable would ignore the essential safety requirement for insulating conductors.