jumper said:
But nothing is written in stone.
Gar is an EE and simply missed the "3 phase" part when you wrote 120/240. Ie: if I see 120/208, I assume a 1 phase system derived from a 3 phase 208Y/120 system.There is no mandatory rule, but convention/custom is as I stated. I believe IEEE has a standard that the higher voltage is listed first and the NEC has this:But nothing is written in stone.Gar is an EE and simply missed the "3 phase" part when you wrote 120/240. Ie: if I see 120/208, I assume a 1 phase system derived from a 3 phase 208Y/120 system.
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I can see that having a standard of using the higher voltage first means it is three phase and if the lower number is first it is single phase would possibly have some merit. But I think there is currently too many people not following any such standard to just assume what is written with no additional information to verify just what is there. I remember when I was in school our instructors used the lower voltage first for everything, and that became my habit also simply because that is how I was trained. I usually am looking for additional adjectives to determine just exactly what is there because of the loose use of simply stating voltages in no particular order.
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