202 302 10.2 E1 402 I4 502 I5 E3 16 +) E2 If E1=19 Volts,E2=D23 Volts, and E3=22 Volts, calculate the values of the indicated currents using KCL and KVL equations. 1= A, 12= A, 13= A, 14= A, 15= A, 16=
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- According to the Code, what trade size EMT is required for each of the following combinations of conductors? Assume that these are new installations. Show all calculations. Refer to Chapter 9, NEC, Table 4, Table 5, and Table 8. a. Three 14 AWG THHN, four 12 AWG THHN __________________ b. Two 12 AWG THHN, three 8 AWG THHN __________________ c. Three 3/0 AWG THHN, two 8 AWG THHN __________________1- The recommended limit of voltage drop on a lighting circuit for a single-phase supply as per IEE Wiring regulations is equal to 6.3 volt. Then the value of supply voltage is a. 290V b. 250V c. 210V d. 230V 2- Which of the following statement is TRUE ? a. Resistance is not proportional to length of the material and Resistance is proportional to area b. Resistance is proportional to length of the material and Resistance is proportional to area c. Resistance is not proportional to length of the material and Resistance is inversly proportional to area d. Resistance is proportional to length of the material and Resistance is inversly proportional to areaIf E1= 27 Volts ,E2= 3 Volts ,and E3= 23 Volts, calculate the values of the indicated currents using KCL and KVL equations.
- Switching, Cords and Cables, Motors, and Related Systems 17.a. What's the maximum-rated ampacity of 10 AWG copper, type STO flexible cord, having two currentcarrying conductors?A. 25 AB. 30 AC. 40 AD. 35 A 17.b. The provisions of Article ___ apply to all switches, switching devices, and circuit breakers (CBs) usedas switches.A. 352B. 100C. 300D. 404equipment grounding 1. The only exception to the need for all information technology equipment to be satisfactorily grounded is where the equipment is A. DC powered.B. backup generator powered. C. double-insulated.D. isolated equipment. 2. Which section of the National Electrical Code lists sizing requirements for wire-type equipment grounding conductors? A. 250.66 B. 250.118 C. 250.4 D. 250.12219.b. In a DC system, the bonding jumper between the negative of the supply and ground is normally madeat the source or at theA. end of the DC line.B. first disconnecting means.C. first device on the supply.D. entrance to the building.
- 1. Electric utility installations and equipment under the exclusive control of the utility donot have to conform to the National Electrical Code. However, they do have to conform to the . 2. Assume you are an electrical apprentice. The electrical foreman on the job tells youto connect some equipment grounding conductors to the ground bus that runs alongthe front bottom of a dead-front switchboard. The system is 480Y/277-volt solidlygrounded wye. The building is still under construction, and a number of other tradesare working in the building. The switchboard has already been energized, and it istotally enclosed except for two access covers near the front bottom where the groundbus runs. The ground bus already has the proper number of and size of lugs for theequipment grounding conductors. You ask permission to turn off the main power sothat you can work on connecting the equipment grounding conductors to the groundbus without having to worry about accidentally touching the phase buses…1.A. When a grounding electrode conductor is connected to the grounded conductor within a serviceequipment enclosure, it's required to be connected to the _______ terminal bus.A. service bonding jumperB. equipment groundingC. grounded conductorD. main bonding jumper1.B. The grounding electrode conductor for a DC system will have that conductor sized no smaller than_______ AWG aluminum.A. 8B. 6C. 10D. 121.C. What are the two key aspects of the installation of the grounding electrode conductor?A. Sizing and protectionB. Bonding and accessibilityC. Materials and placementD. Location and safety1. The only exception to the need for all information technology equipment to be satisfactorily grounded is where the equipment is A. DC powered.B. backup generator powered. C. double-insulated.D. isolated equipment. 2. Which section of the National Electrical Code lists sizing requirements for wire-type equipment grounding conductors? A. 250.66 B. 250.118 C. 250.4 D. 250.122 3. Which of the following statements about grounding electrical equipment is true?A. If no wire-type equipment grounding conductors are present with the branch circuits, the equipment grounding terminal bar isn't required.B. Grounding electrical equipment increases the possibility of metal parts remaining energized.C. The nonmetal parts of some electrical equipment are required to be connected to an equipment grounding conductor. D. Equipment grounding conductors can be spliced together outside of a grounded metal box. 4. Which of the following is a condition that must be met in order to qualify for the exemption…
- The following problems refer to grounding requirements. Give the source of yourresponses.1. What is the proper size copper grounding electrode conductor for a 100-ampere service that consists of 3/0 AWG ungrounded conductors?Explain each option & Choose the correct option. 4) The _ calculated load is rarely placed on an electrical system.A. optionalB. standardC. total 5) What's the primary disadvantage of using copper conductors?A. CostB. AvailabilityC. Weight 6) You're evaluating the components of a multioccupancy building that won't have an on-site employee. To be compliant with the NEC, each occupant will need to have access to their ownA. service-disconnecting means.B. service conductor.C. cable attachment point.D. emergency fire water pump disconnect ..What size branch circuit THW conductors would you need (bare minimum) for an AC 3 phase 40 horse power motor operating at 460 volts ? 8 AWG 6 AWG 10 AWG 12 AWG ...