Which of the following is a safety measure for using electrical equipment in the barber shop?

Ensuring that cords are not frayed and that outlets are grounded is a critical safety measure for using electrical equipment in a barber shop. Frayed cords can expose wires, increasing the risk of electrical shock or fire. Grounded outlets provide a safe path for electricity in case of a fault, reducing the risk of electric shocks and protecting both the equipment and the users. This practice not only safeguards the barber and clients but also helps ensure that the equipment operates efficiently without the risk of malfunction due to poor electrical connections.

Other options do not promote safety. Using any available extension cord can lead to issues with overheating or inadequate support for electrical loads. Keeping equipment plugged in at all times poses unnecessary risks if equipment malfunctions or if there is water present, while allowing water to accumulate near outlets greatly increases the chances of dangerous electrical accidents.