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Science Engineering Journeyman Electrician Practice Test Electrical Engineering
Journeyman Electrician Practice Test
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Conductors with _____ marked on the insulation are NOT THHN approved for use in a wet location. conductors with THHN insulation are approved for use in dry and damp locations only and conductors with THWN, THHW, and THW insulation are recognized for use in dry and wet locations. Given: A one-family dwelling unit with a demand load of 4/0 AWG 200 amperes is supplied with a 120/240 volt, single- phase, electrical system from the local utility company. one-family dwelling 120/240 volt, single-phase, service-entrance conductors to What is the MINIMUM size aluminum THW conductors be sized at an ampacity of not less than 83% of the service rating. Therefore, required for use as service-entrance conductors for this 200 amperes x 83% = 166 amperes; size 4/0 AWG THW aluminum conductors residence? with an allowable ampacity of 180 amperes should be selected for this dwelling. Where a 150 kVA, single-phase transformer having a 625 amperes secondary voltage of 120/240 is installed at a multi- family dwelling, the full-load current rating, in amperes, To find the full-load current rating of the single-phase transformer apply the of the secondary is _____. single-phase current formula as shown:I = (150 kVA x 1000) / 240 volts = 15,000/240 = 625 amperes Which one of the following listed circuit breakers is 75 amperes NOT a standard ampere rating? the standard ampere ratings for fuses and circuit breakers. A circuit breaker with an ampere rating of 75 amperes is not a standard ampere rating. The MINIMUM length of free conductor to be left at 6 inches each junction box for the purpose of splicing conductors, or making connections to illuminares or free conductor is to be left at each junction box for splices or the connection devices shall be _____. of luminaires or devices. The intent of this rule is to ensure enough conductor slack for the terminal connections or splices to be made easily. 1/
4/30/26, 1:31 PM Journeyman Electrician Practice Test In general, overhead service-drop conductors shall 8 AWG copper NOT be smaller than _____. overhead service-drop conductors to be not smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum. Do not get service-drop conductors, the overhead conductors between the utility electric supply system and the service point, confused with the service-entrance conductors, the conductors from the service point from the utility company to the service disconnecting means. When a galvanized eye-bolt is to be used as the point 10 ft. of attachment for an electrical service, the NEC requires the eye-bolt to be installed NOT less than _____ provide adequate vertical clearance of the conductors and prevent physical above finished grade. damage to the conductors and prevent persons from making accidental contact with the conductors which may create a shock hazard or electrocution. In no case shall the point of attachment of the service-drop conductors to be less than 10 ft. above finished grade. Why is electrical continuity required for metallic To establish an effective ground-fault path and facilitate the operation of the conduit? over-current protective device. Electrical continuity is required for metallic conduit to establish an effective ground-fault path and facilitate the operation of the overcurrent protective device. In dwelling units, receptacle outlets installed for 20 inches countertop surfaces, must be located above, but NOT more than _____ above the countertop or work surface. receptacle outlets installed for countertop or work surfaces in dwelling units may be located on or above, but not more than 20 in. above the countertop or work surface. The intent of this rule is to eliminate the use of unsightly extension cords (which reduces the amount of usable countertop space) on the countertop or work surface to supply cord-and-plug connected appliances. Also, receptacles located more than 20 inches above countertops or work surfaces may interfere with the cabinetry to be installed. When conductors are installed in a conduit or tubing 24 inches nipple of _____ or less in length, the ampacity adjustment factors for more than three (3) current-carrying adjustment factors for more than three (3) current-carrying conductors in conductors in the raceway, are not required to be raceways shall not apply where the raceway is not more than 24 inches in applied. length. Where more than 3 current-carrying conductors are installed in short lengths of conduit or tubing, the heating effect caused from the additional conductors is insignificant therefore, the allowable ampacity of the conductors is not greatly reduced. In compliance with the NEC, the total marked rating of 50% a 120-volt, cord-and-plug-connected room air conditioner shall not exceed _____ of the rating of a the special provisions for room air conditioners which are (1) rated not over branch circuit when lighting units, general-use 250-volts ac, single-phase and (2) which are cord-and-attachment plug receptacles, or other appliances are supplied from the connected. In order to prevent overloading the branch circuit, as per Section branch circuit. 40.62(C), the total rating of the A/C unit shall not exceed 50% of the rating of a branch circuit where lighting units, general-use receptacles or appliances are also supplied. https://quizlet.com/522564245/journeyman-electrician-practice-test-flash-cards/?funnelUUID=ac3b3d21-29f2-46a1-8c6e-4974ed340c48 2/
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