Voltage Ratings: 110/115/120, 220/230/240 or 440/460/480

Mike01

Senior Member
Location
MidWest
Thanks for posting this, something that was drilled into my head some time ago by someone [an old timer] I worked with. Now when I call things out this way or go to show someone why its not 120/208 [for a three phase four wire system] they give me funny looks like why dose it matter, for the next one can we dissect transformer vector group notation ex. Dyn1 I still get hung up on these need a good cheat sheet. Thanks all, great stuff!!
 

busman

Senior Member
Location
Northern Virginia
Occupation
Master Electrician / Electrical Engineer
Working on a lot of ships in the past, one of their standard voltages seems to be 460V generation, 450V utilization.

Mark
 

FionaZuppa

Senior Member
Location
AZ
When a local or country has 1 2 3 4 5, or whatever phases in the util distro system, calling out phase should be the standard. This way it does not matter how you write the #'s, having the phase designation removes any Port vs Starboard, Bow vs Stern, Forward vs Aft issue. ;)

"120/240 1ph" = "240/120 1ph"
"120/240 1ph" != "120/240 3ph"

And if you see just "240/120", then it begs the question, how many phases and why was it not labeled correctly/fully?

But that's just me.
 
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