Electrical Test

17 years ago

Hello, I have been an electrician for over 15 years and its time to once again take the test. I have been doing this for the last two months and I am stuck on a couple. Can you help? I don't do to well with test but I am a good Electrician.

1) the minimum size 75 C transformer secondary conductor, not over 3 m long, for a 480 volt primary is 208 volt secondary transformer supplied by a 200 ampere primary overcurrent device is

A) 10 AWG copper

b) 8 AWG copper

C)6 AWG

d)4 AWG copper

I said A?

2) the ampacity of the capacitor conductors of a 21 ampere rated capacitor connected to the motor terminals of a 25 horsepower, three phase, 2008 volt motor shall not be less then

a) 26.50 ampere

b) 30.85 ampere

c) 33.35 ampere

d) 35.85

I said b

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Comments (3)

bus_driver
17 years ago
Question 1 is one of those tricky ones that includes some information not needed for the correct answer and omits other information that would be required for a more specific answer. Question 2 does not have an answer that exactly matches that results of my calculations. And I suspect that you really meant to type 208 volts.
At the risk of being in error myself, I agree with your answer for 1. My calculations for 2 yielded 31.16 amperes, so C would be the closest.
alannaw
Original Author
17 years ago
Yes, I did mean 208 Sorry. Thanks for your help!! I sent in my test and FAILED. I have been doing this for over 15 years and never burnt or did anything wrong but when it comes to test--ugg
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texasredhead
17 years ago
I don't know where you are but there are many places that give prep courses to help you pass the master's test. In Dallas, you have to be a master to pull a permit.