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Old 05-17-2017, 07:51 AM   #1
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Default 3 Phase Transformers

Just have a general question, what gauge wire is typically used by lineman for 3 phase transformers. What practical use are 3 phase transformers used for?
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Old 05-17-2017, 09:32 AM   #2
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Homework huh? What size is typical? There is no answer that fits because you would need to know what size transformer. As far as why use a 3 phase transformer, easy. To supply a 3 phase load.
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Old 05-17-2017, 10:29 AM   #3
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Quote:
Originally Posted by drewburiak2 View Post
Just have a general question, what gauge wire is typically used by lineman for 3 phase transformers. What practical use are 3 phase transformers used for?
The conductor size will varies a bit depending on transfomer size.

Useally on POCO side anything over #6 gauge is typical but again that is very wide answser.

three phase transfomer is used for three phase load.


study up the connection diagram that will keep you busy for a while. there is a few connections diagram ya will memorized. and look back in the fourm there is alot of answers in here.
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Old 05-17-2017, 04:31 PM   #4
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Let's say its a 3-phase transformer with a rating of 225 kVA. What size conductors will I need to fit within the guidelines?
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Old 05-17-2017, 04:42 PM   #5
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Let's say its a 3-phase transformer with a rating of 225 kVA. What size conductors will I need to fit within the guidelines?
What voltage primary, what voltage secondary, in raceway, in free air?
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Old 05-17-2017, 05:36 PM   #6
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Another place 3-phase (wye) is good is if you have a lot of 120V loads, you can have 50% more power available by just adding one conductor (and the 3-phase equipment).
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Old 05-17-2017, 05:37 PM   #7
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Let's say its a 3-phase transformer with a rating of 225 kVA. What size conductors will I need to fit within the guidelines?
Who's guidelines?
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Old 05-17-2017, 06:08 PM   #8
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Let's say its a 3-phase transformer with a rating of 225 kVA. What size conductors will I need to fit within the guidelines?
I am with Backstay on this question..

there is alot differnt way to address the 225 KVA transfomer..

and what guidelines are you refering to that ??

Also what the rough idea of load it will be feeding from this transfomer.,,
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Old 05-17-2017, 08:26 PM   #9
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Electricians don't deal in guidelines for things like this, they deal in requirements and your answers are spelled out for you in the National Electric Code. If you don't know that, you are not an electrician, in which case why are we dealing with you here?
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Old 05-17-2017, 08:53 PM   #10
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dealing with assholes I see, especially JRaef. No I am not an electrician Im am going to school to become and Im only in my first term which is the why of electricity. Didnt realize I was going to be treated this way on a discussion forum. And yeah by guidelines I meant requirements by NEC. Im supposed to ask a question then print out my answers for a project. but just get harrassed thanks
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Old 05-17-2017, 08:56 PM   #11
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Quote:
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dealing with assholes I see, especially JRaef. No I am not an electrician Im am going to school to become and Im only in my first term which is the why of electricity. Didnt realize I was going to be treated this way on a discussion forum. And yeah by guidelines I meant requirements by NEC. Im supposed to ask a question then print out my answers for a project. but just get harrassed thanks
You need to be up front, tell us who you are, what you want and why.
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Old 05-17-2017, 09:03 PM   #12
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couldnt tell that from my question that I obviously have no field experience? and im just learning this stuff? Js
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Old 05-17-2017, 09:04 PM   #13
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Quote:
Originally Posted by drewburiak2 View Post
dealing with assholes I see, especially JRaef. No I am not an electrician Im am going to school to become and Im only in my first term which is the why of electricity. Didnt realize I was going to be treated this way on a discussion forum. And yeah by guidelines I meant requirements by NEC. Im supposed to ask a question then print out my answers for a project. but just get harrassed thanks
If ya say so in first place it will be alot better and some members have to do it for good reason due some of peoples dont bother look for hard fact when it is right on their face.

we can guide them but they have to use them themself.


I am not being mean but if ya keep it driectally to the point and when you are in the traning centre or school they will expain more details too so you will have couple source to find the answer.

There is alot of answer in the forum all just hit the keyword it will show up alot of hit for that subject you are looking for.
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Old 05-18-2017, 06:17 AM   #14
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dealing with assholes I see, especially JRaef.
Drew, you are completely wrong about this, I mean COMPLETELY!

You seem to have a chip on your shoulder, lose it.
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Old 05-18-2017, 03:41 PM   #15
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don't take us wrong,we can be a little grouchy every now & then. but that goes along with the territory.we all have bad days too.what you asked was very broad. kinda like. getting a three phase motor. leaves a lot of details out.
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Old 05-18-2017, 04:02 PM   #16
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couldnt tell that from my question that I obviously have no field experience? and im just learning this stuff? Js
Instead of insulting this or that fellow....

Read the back threads... pretty much all of them...

They're almost instant experience.
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Old 05-18-2017, 04:10 PM   #17
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Quote:
Originally Posted by drewburiak2 View Post
Let's say its a 3-phase transformer with a rating of 225 kVA. What size conductors will I need to fit within the guidelines?
Let's say instead:
112.5KVA, 600Vprimary, 120/208V secondary:
Primary wire size: #1*
Secondary wire size: 500MCM *
*or close enough for a school project.

Now, let's see if you're as quick to say thank you when you're helped as
you were to get angry.
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Old 05-18-2017, 04:25 PM   #18
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couldnt tell that from my question that I obviously have no field experience? and im just learning this stuff? Js
From your question it was obvious ... from your profile, nosumush

About drewburiak2
What is your electrical related field/trade:Residential Electrician

Some of the guys were asking under what reg's ... Because saftey code, and what a lineman (poco) does, are worlds apart


P.S... It's OK to put 1st yr apprentice for your trade
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Old 05-21-2017, 01:39 AM   #19
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If anybody has found any calculator link for this calculation, please share it.
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Old 05-21-2017, 09:43 AM   #20
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Quote:
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If anybody has found any calculator link for this calculation, please share it.

http://wiresizecalculator.net/
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