3 Phase 3 Wire Minimum Size Neutral and EGC

[kwired]

4 wire up to the main, after that its technically 3 wire.

You are only utilizing three wires, the supply system is still three phase four wire. No different from running a single two wire circuit @ 120 or 277 volts from a wye supply.

A three phase three wire "system" is typically a delta supply, can either be ungrounded or corner grounded.

 

[wwhitney]

logic is not considered a technical substantiation

Well there's your problem. : - )

The panel comments will be published as part of the First Draft Report on 7/2. At that point anyone can comment on the panel action in an attempt to change the minds of the panel members.

Prior to 7/2/21, is there any way to see at nfpa.org the panel actions on the public inputs? Or is the only way to know to have "attended" the panel meeting at which the PIs were considered?

Cheers, Wayne

 

[don_resqcapt19]

Well there's your problem. : - )


Prior to 7/2/21, is there any way to see at nfpa.org the panel actions on the public inputs? Or is the only way to know to have "attended" the panel meeting at which the PIs were considered?

Cheers, Wayne

They may publish the "ballot" before then, and the ballot will contain all of the first revisions that were made at the panel meetings, however only the action on the actual ballot is official. The panel meetings only require a simple majority for a PI to become a First Revision. Those FRs must get at least a 2/3s majority to become a FR in the First Draft Report.

 

[don_resqcapt19]

PIs are here?

NFPA 70®: National Electrical Code®

<p>90.2(C) Installations Covered.<br /><br />This Code covers the installation and removal of electrical conductors, equipment, and raceways; signaling and communications conductors, equipment, and raceways; and optical fiber cables for the following:<br /><br /> (1) Public and private...

www.nfpa.org

Yes, just select "view public input". This lets you read all of the public inputs. At this point there is no additional information other than the actual input.

You can also scroll down on that page to each of the Code Making Panels and download the PIs in PDF format by down loading the "public input report". Some panels had so many PIs that the public input report is in two parts.

On 7/2 you can go to the same location and select "first draft report" to see the action on the inputs and at that point you can comment on the action. It will be fairly easy to comment on anything that the code making panel has made a First Revision on, but a little more difficult to find and comment on a PI that was resolved (rejected).

 

[mbrooke]

You are only utilizing three wires, the supply system is still three phase four wire. No different from running a single two wire circuit @ 120 or 277 volts from a wye supply.

A three phase three wire "system" is typically a delta supply, can either be ungrounded or corner grounded.

Typically, however you would not want to call a 3 wire wye system a 4 wire system that does not have a noodle. It creates confusion in the sense that you would expect L-N capability but come reality its not present.

 

[kwired]

Typically, however you would not want to call a 3 wire wye system a 4 wire system that does not have a noodle. It creates confusion in the sense that you would expect L-N capability but come reality its not present.

A wye always has a neutral. If you ground that neutral or utilize it in any way it is definitely a 4th wire of the system. If you leave it floating it is possible to consider it only a three phase three wire system.

Delta "banks" often have a center tap on every phase - whether you actually ground one of them or not is what makes it a three or four wire system.