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MASTER ELECTRICIAN TEST QUESTIONS AND ANSWER 2026
Typology: Exams
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A dry - type TRANSFORMER may be LOCATED in a suspended ceiling space where it is not ready ACCESSIBLE if the voltage is 600 volts or less and has a maximum rating of ____________ kva A) 10 B) 25 C) 50 D( 112 - answ✔✔ 50 (article 450.13 (B) ) A SERVICE head can be located no further away from the point of attachment than ____________ inches A) 18 B) 24 C) 36 D) 48 - answ✔✔24" (article 230.54) (C) (exceptions)
ACCEPTABLE METHODS of connecting GROUNDING and BONDING conductors include all the following, EXCEPT: A) Solder joints B) Terminal bars C) Exothermic weld D) Listed pressure connectors - answ✔✔solder joints (article 250.8 (A) The amount of available fault current at the service depends upon the : A) Method of bonding B) Method of grounding C) Size and impedance of the service transformer D) Ampere rating of the over current protection device - answ✔✔Size and impedance of the service transformer ( general knowledge )
SERVICE CONDUCTORS passing through a building are CONSIDERED OUTSIDE THE BUILDING if: A) The service is rated B) Only one service exists C) They are encased in 2in. of concrete D) There is ground - fault protection of equipment - answ✔✔They are encased in 2in. of concrete (article 230.6 (1) ) A 240 volt, twist - lock RECEPTACLE installed on a TEMPORARY power system of a construction site would require which of the following? A) GFCI protection B) AFCI protection C) LCDI protection D) No protection or testing required - answ✔✔Gfci protection (article 590.6 (B) (1) )
The available current-interrupting rating of a circuit breaker is the maximum _____________ the device is designed for. A) Load B) Voltage C) Fault current D) Ampere rating (marked on the handle of the breaker) - answ✔✔Fault current (article 110.24 (A) ) Where overhead SERVICE-DROP conductors of a 120/240-volt service pass over a roof that has a slope of 6:12 and the roof is not an overhanging roof, the minimum clearance from the roof to the overhead conductor is ___________ ft. A) 1. B) 3 C) 4 D) 8 - answ✔✔3 feet (article 230.24) (exceptions #2)
C) Simi- accessible D) Readily accessible - answ✔✔Accessible (article 100) Which of the following is a multi - wire branch circuit? A) Multiple conductors made up in the form of a cable B) Conductors used to connect the non - current - carrying metal parts of appliances C) A circuit that direct connects the service equipment to the main circuit breaker D) A circuit that consists of two or more ungrounded conductors and a grounded conductor - answ✔✔A circuit that consists of two or more ungrounded conductors and a grounded conductor. (article 100) A listed assembly of two , three, or four insulated circuit conductors within a NONMETALLIC jacket, an extruded thermoplastic covering, or a
sealed nonmetallic covering that can be mounted directly on the surface of walls and ceilings is the definition for: A) Flat conductor cable B) Flat cable assemblies C) Nonmetallic sheath cable D) Concealable nonmetallic extension - answ✔✔Concealable nonmetallic extension (article 382.2) A group of devices that serve to govern in some predetermined manner the electric power delivered to the apparatus to which it is connected is a? A) Device B) Controller C) Disconnect D) Circuit breaker - answ✔✔Controller (article 100)
When a combination of transformer and utilization equipment are supplied by a FEEDER OVER 600 VOLTS, the conductor ampacity shall be not less than the sum of the nameplate ratings of the transformer and the equipment that will be operated simultaneously at ______________ percent. A) 75 B) 100 C) 125 D) 150 - answ✔✔125% article 215.2 (B) (2) Given: Each occupant of a multi - family dwelling is required to have ready access to their SERVICE DISCONNECT. - answ✔✔Yes, for building under continuous management supervision. article 230.72 (C) Given: Each occupant of a multi - family dwelling is required to have ready access to their SERVICE DISCONNECT. Are there any exceptions to this code provision?
A) Yes, for an industrial building B) No, the NEC provides no exceptions C) Yes, for buildings under continuous management supervision D) Yes, for services of at least 400 amperes under continuous management supervision - answ✔✔Yes, for building under continuous management supervision. article 230.72 (C) Devices with SCREW SCELLS shall have the screw shell connected to which conductor? A) Hot B) Grounded C) Grounding D) Ungrounded - answ✔✔Grounded article 200.10 (C) The purpose of using an insulated EQUIPMENT GROUNDING CONDUCTOR connected to an isolated grounding receptacle is:
D) An outdoor receptacle serving a balcony outside the kitchen with no grade - level access - answ✔✔a receptacle for electrical controls of a gas range and cook - top article 210.52 (B) (2) exceptions In a single - family DWELLING BASEMENT which has two entrances, how many LIGHTING OUTLETS are required where the basement is used for STORAGE only? A) 0 B) 1 C) 2 D) 3 - answ✔✔ 1 article 210.70 (A) (3) What is the minimum wiring space in inches, required between the bottom of a SWITCHBOARD and non - insulated busbars? A) 6 B) 8
D) 12 - answ✔✔10 inches table 408. Where liquid tight flexible metal conduit is installed outdoors above grade, the interior of this raceway is considered to be a ____________ location A) Dry B) Wet C) Damp D) Raintight - answ✔✔Wet article 300. At an electrical control panel which has exposed live parts 0f 120 volts to ground , the depth of clear WORKING SPACE shall be at least ____________ inches. A) 30 B) 36 C) 42
D) 2 1/2 - answ✔✔ 1 - 1/ article 300.4 (A) (1) MINIMUM COVER REQUIREMENTS for the underground rigid metal conduit with voltage UNDER 600 volts located in a commercial parking lot shall be __________ inches. A) 6 B) 18 C) 24 D) 30 - answ✔✔ 24 table 300. ARE CLASS 2 REMOTE - CONTROL cables permitted to be STRAPPED or otherwise attached to RACEWAYS for support? A) No, this is prohibited B) Yes, if the raceway is supported properly according to the NEC
C) Yes, if the raceway is not flexible but rigid, such as rigid metal conduit, electrical metallic tubing, etc. D) Yes, if the raceway contains power supply conductors for equipment which the class 2 circuit conductors control - answ✔✔No, this is prohibited article 725. Where flexible cord is connected to the building ceiling with a suitable " tension take - up device" the maximum length of the cord from the supply joint to the take - up device is _____________ feet. A) 2 B) 4 C) 6 D) 8 - answ✔✔ 6 article 368.56 (B) (2) All of the following WIRING METHODS are permitted in a ceiling space used as a return - air plenum except:
Are single conductors with UF insulation permitted to be direct - buried ? - answ✔✔Yes , when all conductors are run in the same trench article 300. Threadless fittings used with RIGID METAL CONDUCT installed in a WET LOCATION shall be : - answ✔✔Listed for use in wet locations The minimum width of clear WORKING SPACE required for a 24- inch wide electrical panel supplied by 240/120 - volt supply is _______ inches. - answ✔✔ 30 article 110.26 (2) What is the maximum number of overcurrent devices that the National Electrical Code permits in one PANELBOARD for lighting and appliance branch circuits? - answ✔✔ 42 article 408.36 (exceptions #2) The CONTINUITY of the GROUNDED CONDUCTOR of a branch circuit is NOT permitted to be dependent on receptacle device connections in ___________ circuits. - answ✔✔Multiwire
article 200.2 (B) ( informational notes) All of the following types of 120 - volt LIGHTING FIXTURES are permitted on the ceiling of a clothes closet EXCEPT a(n): - answ✔✔Incandescent open lamp article 410.16 (B) An ATTACHMENT PLUG is permitted to be used as the disconnect for a room AIR CONDITIONER where: - answ✔✔Approved means is provided on the unit article 440. Electric APPLIANCE nameplates are required to be visible, or to be _____________ - answ✔✔Easily accessible article 422.60 (B) EQUIPMENT shall be installed and used in accordance with instructions included: - answ✔✔In the listing or labeling
