Which grounding method is considered the most dangerous that is still in use?

Bracket grounding is considered the most dangerous grounding method still in use because it offers limited fault protection and can create hazardous conditions under certain circumstances. This method involves connecting the grounding system directly to the equipment frame or structure without a proper pathway for fault current to dissipate safely to the earth.

When a fault occurs, bracket grounding can lead to elevated voltage on the equipment and surrounding structures, putting personnel at risk of electrical shock or electrocution. Additionally, bracket grounding does not effectively prevent step and touch potentials, which are key factors in ensuring safety in electrical installations.

While other grounding methods, such as phase grounding, common grounding, and isolated grounding, are designed with safety and reliability in mind, bracket grounding lacks adequate fault current management and protective measures, making it particularly hazardous in practice.