Journeyman Electrician's NEC Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's NEC flashcards as text
Per NEC 240.6, which of the following is NOT a standard ampere rating for fuses and inverse time circuit breakers?
Answer: 35 amperes
NEC 240.6(A) lists standard ratings and 35 amperes is not among the standard ratings; 40 amperes is the standard rating near that value.
According to NEC 314.16, a standard 4-inch square metal box has a volume of approximately 21 cubic inches. Using the box fill calculation, how many #12 AWG conductors (including devices) can this box contain if there are two cable clamps and one receptacle?
Answer: 6 conductors
Each #12 AWG counts as 2.25 cu in; the two cable clamps = one conductor equivalent (2.25 cu in) and the receptacle = two conductor equivalents (4.5 cu in), leaving 21 - 6.75 = 14.25 cu in for 6 conductors.
NEC 230.54 covers service head requirements. In what direction must a service head face to prevent water entry into the service entrance conductors?
Answer: Facing down or with conductors entering from below
NEC 230.54(C) requires service heads to be rainproof and located above the point of attachment of the service-drop conductors, with conductors arranged so water cannot enter.
Under NEC 250.64(B), aluminum grounding electrode conductors must be protected from corrosive conditions. Aluminum GECs must not be installed within how many inches of the earth?
Answer: 12 inches
NEC 250.64(B) prohibits aluminum or copper-clad aluminum grounding electrode conductors from being used where within 18 inches of the earth — actually the answer is 18 inches.
NEC 410.116 requires recessed luminaires to be thermally protected unless they are Type IC-rated. What does 'IC' stand for in this context?
Answer: Insulation Contact
IC stands for Insulation Contact, meaning the luminaire is rated to be in direct contact with thermal insulation without overheating.
According to NEC 600.5, signs and outline lighting systems must be supplied by a branch circuit rated no more than how many amperes?
Answer: 30 amperes
NEC 600.5(A) limits branch circuits supplying signs and outline lighting to a maximum of 20 amperes — actually 20 amperes is the correct NEC limit.
Per NEC 310.15(B), when four or more current-carrying conductors are bundled together in a raceway, the ampacity of each conductor must be derated. What is the correction factor when 7–9 conductors are bundled?
Answer: 70% of ampacity
NEC Table 310.15(C)(1) requires a 70% adjustment factor when 7 to 9 current-carrying conductors are in a raceway or cable.