ELECTRICAL WIRING:RESIDENTAL-6 PLANS
18th Edition
ISBN: 9781305098329
Author: MULLIN
Publisher: CENGAGE L
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Chapter 17, Problem 9R
a.
To determine
Find the value of VA load for circuit B9.
b.
To determine
Find the value of VA load for circuit B11.
c.
To determine
Find the value of VA load for circuit B12.
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Calculate the circuit parameters of Figure.
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VRE=_______, IB=VRB/RB =__________, IC=VRC/RC =________,
IE=IC+IB =_________
3. The three bus-bar conductors in an outdoor sub-station are supplied by units ofpost insulators. Each unit
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[38-8 kV]
Most residential general lighting circuits are wired with 14-AWG copper conductors and are protected by 15-amp circuit breakers. However, there are many electricians who install 12-AWG copper conductors and protect them with 20-amp circuit breakers. How will you know which conductor size and which circuit breaker size will be used for the general lighting branch circuits in the house you are wiring?
Chapter 17 Solutions
ELECTRICAL WIRING:RESIDENTAL-6 PLANS
Ch. 17 - What is the total current draw when all six...Ch. 17 - The junction box that will be installed above the...Ch. 17 - Why is it important that the hot conductor in a...Ch. 17 - In the diagram, Load A is rated at 10 amperes, 120...Ch. 17 - Calculate the watts loss and voltage drop in each...Ch. 17 - Unless specifically designed, all recessed...Ch. 17 - Where in the NEC would you look for the...Ch. 17 - What is the current draw of the recessed...Ch. 17 - Prob. 9RCh. 17 - Calculate the total current draw for Circuit B9,...
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- h.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.arrow_forwardIn a CE configuration, the voltage gain is __________ . a.always positive b.negative c.almost zero d.very lowarrow_forwardThe parameters of the _________equivalent circuit are defined in general terms for any operating conditions. a.hybrid-pi b.hybrid c.re d.piarrow_forward
- 10. Main bonding jumpers are required to be made of _______ or other corrosion-resistant material.A. copperB. aluminumC. copper-clad aluminumarrow_forwardWhy Kelvin bridge is used for measurement of low resistance ____________________. a. due to a large current flow b. due to power dissipation across the circuit c. due to contact and lead resistance d. due to emf source usedarrow_forwardi need the answer quicklyarrow_forward
- c.1. Which of the following is one of the three essential functions of an equipment grounding conductor?A. Provide an arc-fault current pathB. Establish groundingC. Establish bondingD. Ensure the system is groundedc.2. What's another name for the three-point method of Earth resistance testing?A. Fall-of-potentialB. Line surgeC. Spatial shieldingD. Leakage current c.3. If the National Electrical Code provides a requirement to ground equipment, it generally implies thatthere will be a direct connection to the Earth of a connection through a/anA. grounding electrode conductor.B. equipment grounding conductor.C. equipotential bonding conductor.D. bonding conductor.arrow_forward8.a. A _______ conductor does not carry current during normal operation.A. neutralB. groundingC. phaseD. grounded8.b. "The complete path of an electric current" describes an electric(al)A. fault.B. circuit.C. source.D. component.arrow_forwardHow the required number of branch circuits can be determined?arrow_forward
- Four No. 12 and four No. 10 conductors are to be installed in a EMT conduit 600 V jacketed. What size EMT conduit is required if a. The conductors are Type T90 Nylon? b. The conductors are Type RW90?arrow_forward15. What does a grounding symbol on a construction drawing convey?A. A single ground rodB. A grounding electrode systemC. A ground-fault current pathD. An equipment grounding conductorarrow_forward- Loads, Service, and Overcurrent Protection 6.a. The general lighting load is based on a _______ per square foot basis.A. kilowattB. number of circuitsC. volt-ampereD. general illumination6.b. What's the primary disadvantage of using copper conductors?A. AvailabilityB. WeightC. CostD. Durabilityarrow_forward
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