Which of the following is a common safety feature in electrical installations?

Grounding, insulation, and surge protection are all crucial safety features in electrical installations, making 'all of the above' the most comprehensive answer.

Grounding provides a path for electrical current to safely dissipate into the earth, reducing the risk of shock or fire in the event of a short circuit or equipment fault. It helps ensure that the electrical system is safe by preventing the build-up of voltages that can cause dangerous situations.

Insulation, on the other hand, is critical for preventing unintended contact with live wires and protecting against electrical shock. It ensures that conducting parts are safely shielded to minimize the risk of electric shock and injury.

Surge protection is essential for guarding electrical devices against voltage spikes that can occur due to lightning strikes or other disturbances in the electrical system. By using surge protectors, devices are safeguarded against damage that could arise from these spikes.

Collectively, these features work together to enhance the safety and reliability of electrical installations, making the choice that includes all three safety features the correct and most complete answer.