electromug
New member
I am preparing for the City of Chicago's Supervising Electricians Licensure Examination. Within the Study Guide is the following question:
What is the voltage drop in volts across a 10-foot-long single conductor 3/0 RUH copper wire that carries a 300A load?
Tha possible answer given are:
A. 0.03 V
B. 0.04 V
C. 0.23 V
D. 0.24 V
Using table 8 to determine the resistance of 1000 ft of 3/0 copper conductor, I have to select between coated or uncoated conductor. This selection is important due to the fact that, depending on the "coated/uncoated" property, the calculation result will be either answer C or D.
I have worked this problem by simply calculating the resistance of 10 feet and multiplying by the amperage and also working the long way and calculating the exact K. The result is always the same. So, I am down to the point to where I need to know what exactly RUH conductor is and where to find reference to if it is coated or uncoated.
Chicago's electrical code is based on the NEC, but has removed, added, and edited some articles to meet the needs for their city. I am trying to understand where they are comming from with this question so I can develop a decision technique particular to dealing with these kind of questions in this jurisdiction.
Any help will be much appreciated.
Thanks,
Electromug
What is the voltage drop in volts across a 10-foot-long single conductor 3/0 RUH copper wire that carries a 300A load?
Tha possible answer given are:
A. 0.03 V
B. 0.04 V
C. 0.23 V
D. 0.24 V
Using table 8 to determine the resistance of 1000 ft of 3/0 copper conductor, I have to select between coated or uncoated conductor. This selection is important due to the fact that, depending on the "coated/uncoated" property, the calculation result will be either answer C or D.
I have worked this problem by simply calculating the resistance of 10 feet and multiplying by the amperage and also working the long way and calculating the exact K. The result is always the same. So, I am down to the point to where I need to know what exactly RUH conductor is and where to find reference to if it is coated or uncoated.
Chicago's electrical code is based on the NEC, but has removed, added, and edited some articles to meet the needs for their city. I am trying to understand where they are comming from with this question so I can develop a decision technique particular to dealing with these kind of questions in this jurisdiction.
Any help will be much appreciated.
Thanks,
Electromug