Final answer:
Line voltage thermostats can normally operate on 120V, 240V, or 480V, accommodating various power distribution levels at user sites.
Step-by-step explanation:
Line voltage thermostats (t-stats) can normally operate on a range of voltages. They are designed to handle 120V, 240V, or 480V. This variety allows them to be compatible with the different voltage levels that may be stepped down at individual user sites according to power distribution systems. Depending on the application and the country's standard electrical systems, a line voltage thermostat will be rated for the voltage it's intended to handle.