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

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...

Journeyman Final Exam Questions and Answers 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 -Answer-Answer: 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 and overcurren...

Fundamentals of Physics Exam 4 | Questions and Answers Sonar is a technology used to make maps of the sea floor, as well as to find fish and military targets. Sonar is very similar to medical ultrasound, in that it makes images using sound, but the sonar device is attached to the bottom of a boat and projects downward through the water. While medical ultrasound uses frequencies in the MHz, sonar works best with lower frequencies, because it has to travel longer distances. Calculate the wavele...

ASP Exam Study Guide - Questions and Answers (Complete Solutions) Which is a specific requirement of a hot work permit program? A. Permit must be issued for only cutting operations B. Permit must be issued for all hot work operations C. Permit must be issued for only brazing operations D. Permit must be issued for only welding operations Which is a term used to describe a dust explosion? A. Depression B. Confinement C. Dispersion D. Ignition Which are the four elements necessary to start a fir...

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...

334.10 Look in the NEC index and find uses permitted for NM Cable. The Code Reference for this is? Installed in a storage building for a single-family dwelling Look in the NEC index and find uses permitted for NM Cable. An Example of a permitted use is where? Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:02 / 0:15 Full screen Installed in wet locations Look in the NEC index and find uses permitted for UF Cable. An Exampl...

In dwelling units and guest rooms of hotels and motels, overcurrent protection devices shall NOT be located in _____. - 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. - Answer- 12 AWG Where located in Class I, Division 1 locations, transformers containing oil or a liquid that will burn shall be _____. - Answer- installe...

PSI - Journeyman Electrician Practice Exam Questions And Answers 100% Verified An electrical appliance is rated at 1,500 watts, and is connected to 120 volts. What is the resistance associated with this appliance? - answer9.6 ohms What is the greatest root-mean-square (effective) difference of potential between any two conductors of a circuit defined as? - answerVoltage Approximately how many kilowatts are used by a three-phase, 480-volt ac motor that draws a current of 52 amperes and has...

Journeyman Electrician Exam Questions and Answers 100% Solved Where K=12.9, what is the approximate voltage-drop on a circuit where an 80-ampere, 240- volt, single-phase load is supplied with size 3 AWG copper conductors with THWN insulation, and placed 200 feet from a panelboard? *Chapter 9 tables, table 8 conductor properties (pg. 70-689) - answer7.84 volts voltage-drop formula VD=2KID VD=2 x 12.9 x 80amps x 200ft. =7.84 CM 52.620 CM Given the following information, what is the maxim...

A fitting is a part of a wiring system that is intended primarily to perform which type of function? mechanical When the disconnecting means of a transformer is located remotely it must be? lockable If installed and routed on the outside of a raceway, the length of the equipment bonding jumper shall not exceed how many feet? 6 feet What is an askarel? a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media In which location...