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3 Phase Panel fed from Single Phase Panel #106957
02/17/01 11:33 PM
02/17/01 11:33 PM
Admin  Offline
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Joined: Oct 2000
Posts: 3,524
NY, USA
<img border="0" src=&q...uot;300" height="400">

<font face="Arial" size="2">Click Photo for a closer look</font>


Three phase main lug only panelboard is fed from a single phase service

panelboard 30 ft. away. A 100 Amp. three pole breaker in the single
phase

panelboard is protecting feeder conductors and sub panel.
Frank Cinker

Pittsburgh, PA.

2017 / 2014 NEC & Related Books and Study Guides
Re: 3 Phase Panel fed from Single Phase Panel #106958
02/18/01 07:00 AM
02/18/01 07:00 AM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,371
So..would this be the infamous "Delta Breaker" in 384-16-f ?

Re: 3 Phase Panel fed from Single Phase Panel #106959
02/18/01 08:58 AM
02/18/01 08:58 AM
C
cinkerf  Offline
Member
Joined: Dec 2000
Posts: 84
Pittsburgh, Pennsysvania. ...
Sparky,

You are correct. I presented this code violation in a previous post. (Code Forum) I thought I would send a photo of the sub-panel. As you can see at a glance, it looks perfectly legal. (Without taking voltage readings) Once the Inspector had the service panelboard cover removed the code violation was quite obvious.

Frank (cinkerf)

Re: 3 Phase Panel fed from Single Phase Panel #106960
02/19/01 07:55 PM
02/19/01 07:55 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,371
Frank;
The Delta breaker deal has been, to my knowledge, a no-no for 2 or 3 decades.

There is confusion as to how the introdution of a third leg ( or in this case 2-A legs, 1-B leg ) was accomplished, simply because nobody is going to advertise this .

This makes it something of a curious oddity to newer trade members as I , who have really only been seriously involved at it since the mid-80's

Perhaps you could give us a little history thread on this sometime here?

PS- I wonder if that 2-pole GFI would work on A+A phase ??
[Linked Image]

[This message has been edited by sparky (edited 02-19-2001).]

Re: 3 Phase Panel fed from Single Phase Panel #106961
02/19/01 08:31 PM
02/19/01 08:31 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,903
NY, USA
Sparky,

Frank said that a 3pole 100a breaker was in the singlephase panel that fed this. That's where the 3 wires come from - ABA or BAB sequence I would assume.

Bill

Re: 3 Phase Panel fed from Single Phase Panel #106962
02/22/01 01:56 AM
02/22/01 01:56 AM
T
therain4  Offline
Member
Joined: Dec 2000
Posts: 38
Dunmore,Pa. U>S.A.
Sparky go to electricalzone.com click on
article search and type delta breaker.If I can think of any more references I will keep you posted.

Re: 3 Phase Panel fed from Single Phase Panel #106963
02/23/01 08:32 PM
02/23/01 08:32 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,371
http://www.electricalzone.com/archive/search_display.asp?ID=19970201ecm

Delta breaker article, worth reading, thanks Rain
[Linked Image]

Re: 3 Phase Panel fed from Single Phase Panel #106964
02/23/01 09:08 PM
02/23/01 09:08 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,903
NY, USA

Re: 3 Phase Panel fed from Single Phase Panel #106965
02/23/01 09:53 PM
02/23/01 09:53 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,371
Thanks Bill
[Linked Image]
This Delta deal is a well thought, but dangerous arangement


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