Journeyman Electrician practice test 1(100% Correct)

Journeyman Electrician practice test
1(100% Correct)

when an electrical circuit tested with ohm meter, a short circuit is indicated by a reading of... -
ANSWER0



voltage drop formula - Single phase - ANSWER2 * K-factor * Amp * Length / Circular mils or KCmils of
the conductor used



voltage drop formula - 3-phase - ANSWER1.732 * K-factor * Amp * Length / Circular mils or KCmils of
the conductor used



What is the K-factor for copper and aluminum? - ANSWERCopper: 12.9

Aluminum : 21.2



Motor in a continuous duty application shall have a ampacity of not less then - ANSWER125%



Where do I find conductor size for its ampacity - ANSWERTable 310. 15 (b) (16)



Where do I find standard fuse or breaker size in NEC? - ANSWER240. 6

How to find the K-factor - ANSWERChapter 9,table 8

Multiply resistance of conductor per foot by the Circular mils size of the conductor



Where do I find conductor properties - ANSWERChapter 9, table 8



Where do I find the Full load current for 3 phase, alternating current motor - ANSWER430. 250

If the panel board rating is 100 amperes, what shall be the overcurrent device rating located in
panelboard? - ANSWERNEC 408.36

the overcurrent device rating must not be greater than panel board rating in which is located