To establish an equipotential zone, what must be placed in parallel with the worker?

To establish an equipotential zone, placing a low resistance shunt in parallel with the worker is essential because it allows for the equal distribution of electrical potential across a given area. This means that all points within the equipotential zone are at the same voltage, which significantly reduces the risk of shock to the worker. When a low resistance connection is established, it minimizes potential differences that could exist between a worker and their environment, thereby creating a safety zone where the electrical potential is uniform.

The other choices do not serve this purpose effectively. A high resistance shunt would fail to create a low-resistance path, which is necessary for maintaining the equipotential condition. An insulator does not facilitate electrical flow, making it unsuitable for maintaining an equipotential zone, as it would leave points of varying potential. A transformer is used for voltage conversion and does not create an equipotential zone, as it is primarily concerned with electrical energy transfer rather than grounding or equipotential considerations. Thus, the selection of a low resistance shunt is crucial for ensuring safety in the work environment.