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I have a motor running @ 10% above full load current and the voltage is 10% above motor name plate. What will happen to the current if I get the voltage to nameplate???? 40 HP motor 3 phase, 460 volts nameplate, Wirenut

Contact these people http://www.spectrumtechnologies.net/ They will know.... Wirenut

I passed the PE in April of 2001. I went around to some A&E's and was not too happy with what they had to offer. I recently started a job with a public utility and love it. I know I will never regret getting my PE!!!!!!!!!! I know that it at the very least opened many doors that would have...

PUT A 100 HP MOTOR ON IT. MOVE ON TO OTHER PROBLEMS.... Wirenut

It is very possible that the drive manufactor would offer these resistors as an option. At least they will know how to size it. GET ON THE PHONE!!!!!!!! Wirenut

Be invisible. Enjoy your life away from work. Get a hobby. Don't be a trouble maker. Do what your told at work. Conform. Live long and prosper. Wirenut

Before we are finished we will have you running 0000.... Wirenut

I was assuming you wanted the current from the source, which is the line current. I doesnt matter how the load is connected, the current for the feeder breaker will be the same. Although I have my PE, and have sized cable for industry and Naval ships for years, I am no expert in the NEC...

He did say THHN. I show 90 degrees C with an ampacity of 95 amps. Of course that does not take voltage drop or the fact that you would probably but a 100 amp breaker on the circuit. More than likely he would need but a 100 amp breaker and use #2 awg. Wirenut

86 amps is the current on each phase, 4 awg should work Wirenut

Using the formula AMPS=(KW x 1000)/(VOLTS x 1.73) I come up with 86 amps. Wirenut

WBD Thanks for the information. I have never thought of it that way before now. Wirenut

WBD... What you have said does not make common sense to me, however, I am very trainable. Please provide more detail on how the life of a cable is extended because of heating caused by load current. I have never thought of heat as a benefit to the life of a cable. I do agree with your last...

Your answer does help. As I suspect, and you seem to agree that these distances can't just be looked up in a table. There are many factors to be considered. I can only say that there are no specific standards for this rather unique application. Wirenut

When designing medium voltage switchgear (15kV), do any standards exsist in regard to minim creepage and clearance distances. Should these distances be a factor of envirionmental conditions, scheduled maintenance, etc. Does any one have any references on this subject. Wirenut

I have seen control systems have overload contacts on both sides of the motor starter coil. Wirenut

Good question. I used to know the answer. I'll remember it tonight on my way home. I hope someone comes up with the answer before I leave. Wirenut

Since we are on the subject: What protects the cable on the secondary side??? Would it be the breaker on the HV side??? Wirenut

If you run a 40 hp motor @ 5-10 amps above FLA they will fail. I think you need 50 HP motors. Wirenut

From my experience, motors that drive agitators can be overloaded by a change in the material that is being agitated. A clamp on meter can tell you if you are overloading the motors. Of course proper overload protection should save you, but it sounds like you do not have the proper protection...