What is the peak voltage in a standard 120/208 VAC system?

In a standard 120/208 VAC system, the peak voltage can be determined using the relationship between root mean square (RMS) voltage and peak voltage. The RMS value of an AC voltage is typically the value that provides the same power to a load as a corresponding DC voltage. To convert the RMS voltage to peak voltage, the formula used is:

[ V_{peak} = V_{rms} \times \sqrt{2} ]

For a 120 VAC system, the RMS voltage is 120 volts. To find the peak voltage:

[ V_{peak} = 120 V \times \sqrt{2} \approx 120 V \times 1.414 \approx 169.7 V ]

This is why the peak voltage is approximately 170 V, which corresponds to the RMS value of 120 V in that system.

When looking at the 208 VAC side of the system, the RMS voltage of 208 V relates to the peak voltage similarly:

[ V_{peak} = 208 V \times \sqrt{2} \approx 208 V \times 1.414 \approx 294.4 V ]

However, in terms of standard expectation with 120/208 systems