UNIT 9 VOLTAGE DROP ACROSS CONDUCTORS 81 10. The voltage source across a motor is 238 volts. The motor is located 200 feet from the source voltage. The type of wire used is an alloy, and the CSA is unknown. If the line drop equals 2 volts, find the value of the source voltage. JALuito
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- a. If both elements of the water heater in this residence are energized at the same time, how much current will they draw? (Assume the elements are rated at 240 volts.) b. What size and Type THHN wire is required for the load of both elements? Show calculations.what is the voltage drop percent on two 10 AWG THW copper, stranded, branch- circuit conductors, 120-ft long, supplying a 21 ampere, 240 volt loadSeven 8 AWG copper conductors are run in conduit. Each conductor has type THHN insulation. The conduit is located in an area with an ambient temperature of 138oF. What is the ampacity of each conductors?
- The LRT trolley system 10 miles long is fed by two substations that generate 600 volts and 560 volts, respectively. The resistance of the trolley wire and rail return is 0.3 ohm per mile. If the car is located 4 miles from the 600 volt station draws 200 A from the line. How much is the current supplied by each station?True or False If a metal rack is properly grounded the equipment that is mounted on the rack and in good electrical contact with it is considered to be groundedHow long does it take for the conductors to reach the threshold temperature in a short circuit? Data: 95 mm² PVC/70 conductor, 6 kA presumptive short circuit current.
- Which of the following is an installation requirement for the grounding electrode conductor in acommunications system?A. It must be run as straight as practicable.B. It must be, at minimum, 4 AWG.C. It must be solid or stranded aluminum.D. It must be isolated and covered.Calculate the watts loss and voltage drop in each conductor in the following circuit. Show calculations. Obtain resistance data from Table 8, Chapter 9, of the NEC.The following problems refer to grounding requirements. Give the source of yourresponses. 1. What is the minimum size copper grounding electrode conductor for a service withthree sets of parallel 350 kcmil conductors (three conductors per phase)?
- 20.a. What's the primary disadvantage of using copper conductors?A. DurabilityB. CostC. AvailabilityD. Weight20.b. The NEC requires that each service-disconnecting means be suitable forA. hazardous locations.B. disconnecting the meter.C. wet conditions.D. the prevailing conditions 20.c. As a general rule, each building or structure is limited to a single service. What's an automatic exceptionto this rule?A. A second service deemed suitable for useB. A second service having the proper markingsC. Emergency systems or fire pumpsD. Higher building occupancyDescribe what the following conductor designation means when it is printed on the insulation; RHH/RHW,USEQUESTION 9 When a ground wire is connected to an interior gas piping system and the underground portion of the gas pipe into the building is plastic, which of the following is (or are) true? a A.This would be approved by code as the gas pipe is only being bonded to the electrical system. b B.This installation would be approved by code, as the gas pipe is not a grounding electrode. c C.Both A and B d D.Neither A nor B