Hi Leg Delta Transformer

[phawk48]

In a 3 phase panel with a high leg, doesn't the high leg have to be identified? I can't find it in the code book.

 

[roger]

See 110.15 and 230.56

Roger

 

[electricalperson]

the high leg needs orange to identify it

 

[roger]

the high leg needs orange to identify it

Not necessarily.

Roger

 

[electricalperson]

i dont have a code book handy but i remember the question was on my test. the color of the high leg of a 120/240 3 phase system has to be orange if im not mistaken

 

[roger]

i dont have a code book handy but i remember the question was on my test. the color of the high leg of a 120/240 3 phase system has to be orange if im not mistaken

It would depend on how the question was worded.

Roger

 

[electricalperson]

i never worked in a system like that..where are they normally located and what are the reasons for a 120/240v 3 phase system? sorry to turn the thread around

 

[realolman]

If you have lots of 240 3 and 1 ph loads and not so much 120v loads.



I'll bite... what the heck...:smile:

What "other effective means" besides orange is OK to mark the hi leg?

 

[jrannis]

i never worked in a system like that..where are they normally located and what are the reasons for a 120/240v 3 phase system? sorry to turn the thread around

Heres how they send open delta to you. For those that missed it.

 

[realolman]

No comprendo I thought we were talking about a delta connected three phase, with one transformer center tapped for 120v? Which has a phase that is about 190 v to neutral?

Don't make it harder for me. I hardly ever know what's going on as it is.

 

[roger]

Realoman, Jr's post was a joke.

As far as marking the high leg.

110.15 High-Leg Marking
On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, only the conductor or busbar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is orange in color or by other effective means. Such identification shall be placed at each point on the system where a connection is made if the grounded conductor is also present.

Other effective means could be tagging for example.

Roger

 

[infinity]

Realoman, Jr's post was a joke.

As far as marking the high leg.

110.15 High-Leg Marking
On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, only the conductor or busbar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is orange in color or by other effective means. Such identification shall be placed at each point on the system where a connection is made if the grounded conductor is also present.

Other effective means could be tagging for example.

Roger

Roger,

I would agree that other effective means could be orange tape but a tag? Would this really satisfy the code? I would have a problem with a tag being effective. If I were to open a panel an orange conductor or busbar would be highly noticeable, IMO a tag may not be.

 

[iwire]

I think the other effective means line opens the door to any method at all that the inspector deems effective.

I think some areas use purple as the high leg mark, and other areas move it to phase C instead of B which is what 408.3(E) Exception recognizes

 

[roger]

Rob, using the wording there would be nothing prohibiting tagging or labeling the conductor, it is as Bob said, what ever is accepted/approved by the AHJ.

Roger

 

[realolman]

Realoman, Jr's post was a joke.

Roger

I don't get it:smile:

 

[don_resqcapt19]

The 2008 code also requires a label on the outside of the panel stating the phase and voltage of the high leg. 408.3(F).