EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 21.1, Problem 5R
To determine
Mention the size rating of the fuses installed when an additional backup overcurrent protection needed.
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Chapter 21 Solutions
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- Lockout is required: During servicing and maintenance where unexpected ener- gization or start-up of equipment could harm employees. During repair and replacement work, and during renovation work. a. b. C. During modifications or other adjustments to powered equipment. d. All of the above. Lockout may involve: Opening a disconnect switch. b. a. Closing a valve. Placing a block in the equipment. d. All of the above. C. Lockout is the process ci Shutting off a machine at the end of a shift. Warning equipment operators about the risks involved in bypassing a machine guard. Preventing the flow of energy from a power source to a piece of equipment, and keeping it from operating. a. b. C. d. Preventing mechanics from starting repairs without the machine operators' knowledge. Tagout: Serves as a warning. b. Physically restrains a person from operating a power source. Must be applied using specialized tagout tools. a. C. d. Must be worn like a badge by the employee who is doing the repairs.…arrow_forwardIn the conduit layout shown in picture attached, determine how many wires are contained in each conduit between each piece of equipment. Identify each wire with a proper terminal marking, as shown in the example, above the disconnect switch.arrow_forwardNeed Answer.arrow_forward
- For motor Branch circuits, the maximum setting of a conventional inverse - time circuit breaker must not exceed____of the full- load current of the motor. a.100% b.125% c.200% d.250%arrow_forwardWhat is the minimum conductor ampacity, overload protection, and dual element fuse rating for a circuit supplying a 560 volt, 3 phase, code J, 40 degree Celcius, 125 horse power motor with a nameplate full load current of 115 amperes?arrow_forwardFinal answer upto two decimal placesarrow_forward
- GRADES: Three-phase system 208 volts All conductors at 75 degrees Celsius Use the maximum standard protections All motors are squirrel cage. 1. System main switch (inverse time switch) 2. Main conductors plus their grounding (ambient temperature is 30 Celsius degrees) 3. Grounding of the grounding electrode and its electrodes (use a delta landing) 4. The main system pipe 5. For 4 motors with nameplate data, see images (they make up a branch of the system) calculate for each:arrow_forward45. A switch or circuit breaker can be used as both the controller and disconnecting means if it a. opens all ungrounded conductors as required by NEC 430.103 b. is protected by an overcurrent device in each ungrounded conductor c. is manually operable, or both power and manually operable d. All of these answersarrow_forwardFault analysis is done to decide the __________________ of switch gear. a. breaking current b. reactance c. negative sequence relay d. relayarrow_forward
- A 25-HP, continuous-duty, three-phase squirrel-cage induction motor is connected to a 240-volt line. The conductors are run in conduit to the motor. The motor does not have a NEMA design code listed on the nameplate. The termination temperature rating of the devices is not known. Copper conductors with THWN insulation are to be used for the motor connection. What size conductors should be used?arrow_forward(b) () Discuss the cascade control scheme for a heat exchanger system with a neat diagram. (ii) List down any two merits and two demerits of a cascade control system over ratio control system.arrow_forwardDraw the schematic diagram of a double line to ground fault andbasic equipment of a substation.arrow_forward
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