Which of the following is an acceptable way to protect electrical wires?

Using protective conduit or sleeves is the most effective and acceptable method to protect electrical wires. This approach enhances the durability and safety of the wiring by providing a physical barrier against moisture, physical damage, and abrasions that could compromise the insulation or function of the wires. Protective conduits also help to prevent inadvertent contact with live electrical parts, thereby reducing the risk of electrical shock or fire hazards.

Conduits are typically made from materials that are resistant to environmental factors, ensuring the wires are safeguarded over time. Additionally, this method adheres to electrical codes and standards which mandate the proper safeguarding of electrical installations to maximize safety and reliability.

While other options like covering wires with cardboard or running them alongside plumbing may seem like temporary solutions, they do not offer adequate protection. Leaving wires exposed poses significant safety risks, such as potential damage from external factors and increased hazard for electric shock. Thus, using conduit or sleeves stands out as the best practice in protecting electrical wiring.