480v primary to 120/208 -3 phase neutral confusion

[infinity]

Just to be sure everyone is on the same page, you mean like the marked up image below?

Yes where you've added the label that is the neutral connection point.

 

[hillbilly1]

Just to be sure everyone is on the same page, you mean like the marked up image below?

Cheers, Wayne

View attachment 2575005

Yes

 

[ggunn]

Looks like X0 lead on Delta-WYE xfmr diagram below should be 1 of 4 leads, which measures the same Ohm values across each of the other 3 leads.
View attachment 2575000

What does the dashed line to N signify?

 

[ramsy]

What does the dashed line to N signify?

When you hear silence, it means nobody knows

 

[augie47]

What does the dashed line to N signify?

Dash lines show angular displacement between high and low voltage windings

 

[jim dungar]

A dashed line represents the referenced phase angle of the connection point.
On the OP nameplate there is a dashed line shown at 30° from H1. There would then typically be a dashed line or X0 shown at 0°.