What is a common requirement for bathrooms regarding electrical installations?

In bathroom installations, one of the key requirements is the use of GFCI (Ground Fault Circuit Interrupter) protection. This is mandated to enhance safety in areas where water and electricity may come into contact, which is especially prevalent in bathrooms. GFCI devices are designed to quickly shut off power in the event of a ground fault, thereby significantly reducing the risk of electrical shock.

The other choices, while they may seem relevant to bathroom electrical installations, do not represent common or necessary requirements. For instance, having a ceiling fan is beneficial for ventilation but is not an electrical code requirement. Similarly, a direct power line is not a specification required for bathroom electrical setups, and using a 240-volt outlet is typically inappropriate for bathroom circuits, which are usually wired for 120 volts to accommodate standard lighting, receptacles, and small appliances. Thus, the requirement for GFCI protection stands out as a critical safety measure to mitigate risks associated with electrical hazards in damp locations.