Describe the purpose of ground fault circuit interrupters (GFCIs) in pipefitting.

The purpose of ground fault circuit interrupters (GFCIs) in pipefitting is to prevent electrocution by shutting off electricity. GFCIs monitor the electrical current flowing through a circuit and can detect any imbalances that may occur, such as when electricity is leaking from a device, potentially through a person's body to the ground. If an imbalance is detected, the GFCI rapidly disconnects the power supply, greatly reducing the risk of serious injury or fatality from electrical shocks. This is particularly important in pipefitting, where workers often operate in damp and potentially hazardous environments, making the risk of electric shock significantly higher.

The other choices do not accurately reflect the primary function of a GFCI. Enhancing circuit efficiency, increasing electrical output, or providing a backup power source are not objectives of GFCIs. Instead, their sole focus is on ensuring safety by minimizing the risks associated with electrical shock.