If an electric furnace is marked 208/230 single phase 60Hz and a technician reads 200 VAC at the power supply, what does this indicate?

In this context, the reading of 200 VAC at the power supply indicates that the voltage is below the acceptable range for the electric furnace, which is specified as 208/230 volts. Electric furnaces are designed to operate efficiently within this voltage range, and the nominal voltage of 230 volts allows for acceptable variations due to load and supply conditions.

When the voltage drops to 200 VAC, it falls short of the lower end of the specified voltage range (208 volts). Operating an electric furnace at a voltage that is under this threshold can lead to a range of issues, including reduced heating performance, longer operating times, and potential strain on the furnace components. Therefore, measuring 200 VAC signifies that the voltage supply is inadequate for the proper operation of the furnace, which is why this option is the most accurate assessment in this situation.