What is the minimum length of free conductor required when entering a standard single-gang device box?

The minimum length of free conductor required when entering a standard single-gang device box is indeed 75 mm (3 inches). This requirement ensures that there is enough conductor length available for proper termination at the device within the box. Adequate length of conductor is crucial for making secure connections without excessive stress or strain on the wires, which can lead to potential failures or hazards.

This standard length helps technicians and electricians easily work with the wires to make connections to switches, outlets, or other devices while also adhering to safety and code compliance. The regulation promoting a 75 mm length is grounded in industry practices that prioritize safety and functionality in electrical installations, ensuring that there are no tight bends or stress on the conductors as they enter the boxes.