What does a personal jumper consist of in electrical work?

A personal jumper, used in electrical work, is designed to provide a temporary and safe electrical connection for grounding purposes. It typically consists of one or more ground cables that are equipped with clamps, which allows the jumper to be securely attached to electrical equipment or structures.

The multiple ground cables in personal jumpers enable flexibility and enhanced safety, as they can connect to various grounding points as needed based on the electrical configuration. The clamps ensure that these connections are tight and reliable, helping to prevent accidental disconnection or exposure to electrical hazards during maintenance or fault conditions.

In contrast, the other choices are limited in that they do not encompass the full functionality or configuration of a personal jumper. For example, a single ground cable may not provide the redundancy or secure connection necessary for safe electrical work. Ground cables and a transformer, or ground cables and an insulator, reference components not typically associated directly with personal jumpers for grounding purposes, focusing instead on power distribution and electrical isolation, respectively. Thus, the correct choice accurately represents the essential elements that constitute a personal jumper in the field of electrical work.