- Location
- Windsor, CO NEC: 2017
- Occupation
- Service Manager
Suppose you had a 3-phase 208Y/120 volt system and a 1-phase 120/240 system on the same premises. How would you identify the conductors?
Referring to Article 250.56 [ `14 NEC ], ...or "by other effective means"......Each end"Suppose you had a 3-phase 208Y/120 volt system and a 1-phase 120/240 system on the same premises. How would you identify the conductors?"
Suppose you had a 3-phase 208Y/120 volt system and a 1-phase 120/240 system on the same premises. How would you identify the conductors?
Since I would be placing a label at the service equipment I might go with Black, Red, Blue, White for the 208y/120 and Brown, Orange, Gray for the 120/240.
But that's just me.
Roger
Since I would be placing a label at the service equipment I might go with Black, Red, Blue, White for the 208y/120 and Brown, Orange, Gray for the 120/240.
But that's just me.
Roger
I'd use continuous finish wire for three phase, and blue/red stripe-on-black finish for the single phase system.
i would never use BOG for a single phase 120/240v system. It would cause significant confusion for those that associate grey as a 277v nuetral and orange as a High leg of a 240v delta 3 phase ......
Just not good.
He said single phase on the 120/240
Suppose you had a 3-phase 208Y/120 volt system and a 1-phase 120/240 system on the same premises. How would you identify the conductors?
Many Jurisdictions do not allow Grey as a nuetral in anything other than a 277v/480 system.So doing code compliant work is not good because some people are clueless?
Mea Cupa--- I didn't pay attention to the gray and assumed a phase.. Thanks-Yes and brown orange gray would be hot, hot, neutral respectively.
I figured my reply would raise some eyebrows Bob.So doing code compliant work is not good because some people are clueless?
You would have to provide a label identifying the systems and branch circuits, it's a code requirement, see 210.5(C)If I was forced into the label thing I would use BOY-G for the 3 phase and BBW.
I figured my reply would raise some eyebrows Bob.
Roger
Sounds great until you have to buy it.
:blink:Ok, then I'll fake it.
I'll tape each line of the single phase system with one stripe of tape. And I'll tape each phase of the three phase system with three stripes of tape. All while using the standard black-red-blue-white colors of tape, on wire that is initially black. Not sure what to do about the black-on-black.
Another option is to use the P-touch machine to apply a textual label to wire of the colors black-red-blue-white, identifying each wiring system in words.
That is what I recommended on a drawing set, where an exotic 380V delta system was used. Use BOY to identify that voltage is of a higher variety, and apply a textual label to it, to identify what there is no convention for identifying.