<https://blog.uk.tdk-lambda.com/uk/2018/04/04/how-is-the-us-277vac-input-voltage-derived-and-why-is-it-used/>
<http://schema.org/name>
"How is the US 277Vac input voltage derived and why is it used? &#171; TDK-Lambda UK Blog"
<https://blog.uk.tdk-lambda.com/uk/2018/04/04/how-is-the-us-277vac-input-voltage-derived-and-why-is-it-used/>