What does line voltage refer to in electrical controls?

Line voltage refers to the normal electric supply voltage that is delivered from the power source to the electrical devices and systems within a facility. This is essentially the voltage available at the supply lines and is typically defined by the electrical standards of the region. For example, in North America, common line voltages include 120V and 240V, whereas in many other parts of the world, it can range from 220V to 415V.

Understanding line voltage is crucial for engineers and technicians because it helps in the proper selection and operation of equipment and control systems. Using the correct line voltage ensures that devices receive the appropriate amount of power for efficient functioning, and training in handling line voltage is vital for workplace safety and efficiency.

The other options do not accurately describe line voltage. Rather than focusing on a measure of resistance, the output of low-power devices, or safety voltage levels, recognizing line voltage as the standard supply voltage helps link it directly to operational effectiveness in electrical control systems.