Effective time management is always an issue when taking the electrical exam. Calculation related questions often take the greatest amount of time to answer.
Knowing in advance how to quickly identify the formula required to answer these questions is key to effectively managing your time and achieving a passing score.
How quickly can you answer the following question:
What is the total length of conductor required to supply a 50-amp load supplied by a 240 volt three-phase source if #8 aluminum XHHW-2 insulated conductor is used?
A. 64.95 feet
B. 129.90 feet
C. 194.85 feet
D. None of the above
Solution:
C. 194.85 feet
Use the following formula:
D = CM x VD Permitted/1.732 x K x I
= 64.95 ft. x 3 conductors = 194.85 ft. total length of conductor required.
To choose the right answer you need to ask the questions.
What do CM, VD Permitted, K and I represent?
Why is 1.732 included in the equation?
Why is the distance multiplied by three conductors?
Knowing how to answer these kinds of exam questions is key to passing the electrical exam. Prepare for success. Click on the “Register Now” tab or call 888-919-3926 today.