Skip navigation

Voltage Variations

When it comes to the proper way to write system voltages, first you have to know which voltage you’re actually talking about.

I knew I was missing something important when as a mid-level electrical engineer, I used to wonder which voltage value I should be using in my calculations. Was it 110V, 115V, 117V, or 120V? Was it 208V, 220V, 230V, or 240V? Was it 120/240V, 240/120V, 120/208V, 208/120V, 277/480V, or 480/277V?

Register to view the full article

Register on EC&M and gain access to premium content, including this article and much more.

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.