What three aspects should mechanical jumpers be checked for?

The correct choice emphasizes critical safety and performance considerations when inspecting mechanical jumpers used in electrical applications. Good insulation is essential to prevent electrical failures and ensure safety, as it protects against inadvertent contact with live components and reduces the risk of short circuits. Proper wire size is equally important, as it ensures that the jumper can handle the expected current flow without overheating or causing voltage drops. Tight connections are crucial for maintaining effective conductivity and reducing the likelihood of arcing or equipment failures.

Inspection aspects such as length, flexibility, and weight focus on physical characteristics rather than the crucial safety and electrical performance considerations. While resistance and load capacity are significant factors in some contexts, they are not the primary focus when assessing jumpers before installation or use. The emphasis on good insulation, appropriate wire size, and proper connections aligns directly with industry standards and safety practices in electrical work, making this choice the most pertinent for mechanical jumper inspections.