600 volts or more - Study guides, Class notes & Summaries

A 150 kVA service transformer has a 480Y/277 volt 3-phase primary and a 208Y/120 volt, 3-phase secondary. What is the approximate full-load ampere rating of the primary of the transformer? - ANSWER-180 amperes Where a conductor is marked RHW-2 on the insulation what does the "-2" represent? - ANSWER-The conductor has a maximum operating temperate of 90 degrees C. For a grounded electrical system supplied by a feeder or branch circuit, the equipment grounding conductor shall be sized in a...

Journeyman Final Exam Questions And Answers 100% Verified Which of the following conductor insulation types, if any, is/are acceptable for wiring in a fluorescent luminaire when the branch-circuit conductor passes within three (3) inches of the ballast? I. THW II. THWN 1.) neither I nor II 2.) both I and II 3.) I only 4.) II only - answerAnswer: both I and II Table 310.4(A) on page 70-153 of the NEC® 2020 Fire pump supply conductors on the load side of the final disconnecting means ...

NICET Prep: Fire Alarms Exam Questions Correctly Answered. Assembly Occupancy's are buildings used for gathering of _____ or more people for deliberation, worship, entertainment, eating, drinking, amusement, awaiting transportation or similar. - CORRECT ANSWER 50 people Class 3 wiring installed under roof decking is required to be at least __ inches below the roof decking - CORRECT ANSWER 1.5 Inches The minimum length of free conductors at outlet boxes is - CORRECT ANSWER 6 Inches ...

Industrial Red Seal Practice Exam Questions and Answers Already Passed NB: Answers appear before each question and are highlighted in yellow. B Which meter will be damaged when used on an energized circuit? A) A wattmeter. B) An ohmmeter. C) An ammeter. D) A voltmeter. D The open circuit voltage of a lead acid battery is 39 Volts, and the terminal voltage is 35 Volts when connected to a 141 Amp load. What is the internal resistance of the battery? A) 4.0 ohms. B) 1.7 ohms. C) 0.283 ohms. D)...

Electrons flow from __________ to ____________. - negative, postitive What is the better conductor of electricity? Copper, Gold, oil, or aluminum - gold One horsepower equals ____________. - 746 watts Transformers are used to lower voltages because very _____ voltages can be transmitted easier and cheaper than 240 volts. - high High voltage is defined as above ____ volts. - 600 Effective voltage is defined as what percent of peak voltage? - 70.7% Formula to fi...

There are six conductors in a raceway connected to 75° rated breakers. Each wire has a 70-amp load using THHN conductors. The minimum size conductor used are #__________ AWG. a. 4 b. 6 c. 8 d. 10 a Thermal insulation shall not be installed within __________ inch(es) of recessed fixtures. a. 1⁄2 b. 3⁄4 c. 2 d. 3 d Brainpower Read More A 1-inch conduit contains three 3-wire circuits. All conductors are #10 TW. Each circuit consist of two phase conductors, one gro...

In dwelling units and guest rooms of hotels and motels, overcurrent protection devices shall NOT be located in _____. correct answer: bathrooms The conductors in multiconductor portable cables, of over 600 volts nominal, used to connect mobile equipment and machinery, shall be at least size _____ copper or larger and employ flexible stranding. correct answer: 12 AWG Where located in Class I, Division 1 locations, transformers containing oil or a liquid that will burn shall be _____. corr...

MASTER ELECTRICIAN REAL TEST QUESTIONS ANSWERED CORRECTLY Given: Two separate Services are identical in voltage and amperage, except that one service serves only motor - loads and the other serves lighting loads only. in the event of a short circuit in these services, the available short circuit current will be: A) The same in either service B) Higher in the motor-load service C) Higher in the lighting -load service D) 25% greater in the service for the motor load - ANSWER The s...

An attached garage shall be separated from all habitable rooms above the garage with not less than 5/8 of an inch gypsum board A structure that is intended for swimming or recreational bathing is considered to be a swimming pool if it contains water over 24 inches What type of fastener do you use to install cabinets? Truss head wood screws The process of preparing sand underneath a concrete slab requires sand to be Compacted Habitable space in a basement shall hav...

Both residential and commercial solar photovoltaic systems operate on the same principle and both pose similar dangers, the greatest hazard of which is ____? correct answers direct current (DC) shock The residential system generally is smaller and may contain fewer safety features than the larger commercial system. Most photovoltaics are made primarily of ____?, the second most abundant element in the earth's crust, and the same semiconductor material used for computers. correct answers S...