What do you mean by 240Y / 131 V network specification?

Question

I was referring an industrial control panel guide for North American market for the network specifications. The specification mentioned a voltage rating 240Y/131V. I am curious, how would one get a phase voltage of 131V for 240V line to line, since for the star network the formuala is: Eline=√3×Ephase and it should be √3×131=226V (which is far away from 240). Am I using the wrong concept ? However, for other Y networks shown, the Eline=√3×Ephase formula works -
277×√3=479.778(480V approx.) and √3×347=601.021(600V approx.)

Answer 1

The specification mentioned a voltage rating 240Y/131V. I am curious, how would one get a phase voltage of 131V for 240V line to line

It's likely a typo or a miscalculation. You just can't trust everything you read. It's not a million miles off so no big deal because most equipment designs should easily work without fault (or glitch) with a 5% or 10% variation. 230 x 1.05 = 241.5 volts hence, it really shouldn't be a problem.

In EE design engineering, it's always best to double check what you can (just as you have done in your question - good work).