3 phase motor...

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masterelect1 said:
NO, you can not
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Why not? I can think of a case, as with smaller motors, where the OCPD might suit both the motor and the fixture, as long as 210.23(A)(2) wasn't exceeded by the motor. I think the general answer might be no, but I'm sure you could set up a case where it would be okay.
 
3 phase motor-- does that mean no neutral? What voltage lighting? Lots of questions-- amp of motor, etc. Can you give us more info
 
3 phase motor...

The system we use 3 phase, 4w, 50 hz, 415/240 V. The motor is rated 3phase, 3.0hp, 9.6 amp.

I'm sure you could set up a case where it would be okay. I don't want to re-invent the wheel...I just want to know if that is possible? But most of you answered NO!!!

Thank you much...
 
What size is the wire feeding the light? What size is the breaker for the lighting circuit? Is there three 1-pole breakers for the lights, or one 3-pole? How many lights are already on the circuit? What do they draw for amperage? Is voltage drop going to be a problem with the motor hooked up to this circuit? Are you going to provide proper protection for the motor and the conductors feeding it? Are the lights on a switch/contactor/photocell/timer that will prevent the motor from operating when the lights are off? Lastly, why do you want to do it this way?

Possible? Yes. Good design? IMPO, no.
 
3 phase motor...

Actually it just came up with my mind and since you're the expert on this matter I just wanted to know it. Because my engineer will ask me question(s) sometime(s)/most of the time and I don't have idea about it and I need to research it first so I do the research ahead of time.

Question(s) like; Can a motor rated 3 phase can be run by a single phase source? before I don't know the answer, but know I have an idea how I can run the motor using rotary converter, etc....and question(s) that I might able to use in the future.

By asking question(s) ahead of time from people who are expert on their field like you, I believe that's the best thing I can do because I want to learn and want to participate on the discussion(s) with my engineer. It's awkward when people are saying something and you don't have idea on what is going on. And ofcourse use it when I will work as an engineer.

Thank you!!!
 
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question

480sparky said:
In other words, this was a hypothetical question. :wink:
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and he got a hypothetical answer (possibly s.o.p.)
 
Eduardo Maun said:
Actually it just came up with my mind ... I just wanted to know it.
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No problem. Please PM all the respondants with your name and address so that they can send you a bill for their time. ;)
 
Eduardo Maun said:
The system we use 3 phase, 4w, 50 hz, 415/240 V. The motor is rated 3phase, 3.0hp, 9.6 amp. ...
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Did anyone pick-up on that ?

Eduardo Maun said:
...
By asking question(s) ahead of time from people who are expert on their field like you, I believe that's the best thing I can do because I want to learn and want to participate on the discussion(s) with my engineer. It's awkward when people are saying something and you don't have idea on what is going on. And ofcourse use it when I will work as an engineer.
....
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I suggest your get out ASAP to a few of the jobs that they have on Paper. Take the Riser diagram and the Floor plan and see how the expect in the field put it together, hopefully in the rough in stage. Walk all of the riser and note what going on in all the electrical room(s) or distrubation panels. Then you can have some basic questions IMO.
Please note all the things that are not Engineered in the Design. Alot of things are presented in the specificiations, read your own electrical section of the Specifications, additional articles dealing with the Local Building Codes, the AHJ, or other requirements based are all based on the structure type of building.

In general but not always with heavy commerical or industristral do you really get into the Odd electrical applications, VFD's, MCC, large motors, relays, contacts, Etc.
 
Eduardo Maun said:
In a 3 phase system can I tap a lighting fixture in 3 phase motor connection?
Is this allowed by the code?
Eduardo.
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You might end up having to put OCPD in the supply to the light fixture, but I can't see any reason it would be prohibited.
 
3 phase motor...

YES...

This is not ralated with forum discussion(s), It's about other oppurtunity(s) for me.

I know most of the member here are professional and working in different Company(s). I think you can help me reach my goal in life to live and work in USA God's will,do you know Company(s) who sponsor a foreign skilled worker? I was interviewed by a recruiter and said I'm qualified for the position I'm applying for but at the end of the interview he asked me what is my visa status I told him I don't have visa in USA. He told me that they don't sponsor a foreign skiled worker. He is technical recruiter at Think Energy Group.

I'm currently working with U.S. Army Central Command, Camp As Sayliyah Doha,Qatar thru ITT Industries, Systems Division under Department of Public Works - Architectural & Engineering Group as a Cad - Technician. I have a degree in B.S. Electrical Engineering and pass the Registered Master Electrician given by the Professional Regulation Commission - Philippines. My other work experience(s); Maintenance Engineer,Cad Engineer, Maintenance Clerk/ Scheduler. I'm proficient in Auto-Cad, knowledge in Primavera, Programmable Logic Controller (PLC ),Micro Station V 7.1 SE & V8 and other Engineering design software.

I believe my education and work experience are the basic requirements to have a visa. I need a Company who can sponsor me and I strongly believe you can help me to find a sponsor. Or a US citizen who have a business and with atleast 10 employee(s).

I can work as an entry level engineer,staff, cad tech.,drafter, electrician or other position(s) that suited my qualifications. I know US standard is high but my present job with USA Army will be my steppping stone to get my goal.

Thank you!!!

May God Bless you all...

Eduardo
 
mdshunk said:
Why not? I can think of a case, as with smaller motors, where the OCPD might suit both the motor and the fixture, as long as 210.23(A)(2) wasn't exceeded by the motor. I think the general answer might be no, but I'm sure you could set up a case where it would be okay.
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So, in other words, the motor has to be running for the light to be on, making it ( motor) in effect, a switch. After all, he did say in the motor connection.
 
Where would you tap off of this circiut? and what kind of light fixture would you be using incandescent or flourescent? 3-phase motor circuits dont have a grounded nuetral conductor. If you did happen to have a nuetral conductor in a j-box somewhere along the way the motor and you did connect it to a luminare I would think that the ballast and bulb would have a shortened life-span due to the motor starting up and the initial influx of current.
 
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