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need help for pennfoster electrical...
need help for pennfoster electrical examen answers # ***** ( NEC Graded Project).
Submitted: 1 year ago.Category: Homework
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Customer reply replied 1 year ago
Fastened-in-Place Appliances: Water heater (28 kVA), Dishwasher (1,200 VA), Food Disposal (1,200 VA), Attic Fans (2) @ 750 VA (1,500 VA total)
• Clothes Dryer: 5 kW
• Ranges, Ovens, Cooktops: Range 12 kW
Question 7: Total Demand, Service Size and Service Conductors Based on your calculations for questions 1–6, determine the total demand in VA for this residence, the minimum service size, and the minimum conductor sizes (THW) for the ungrounded and grounding electrode conductors (assume the neutral conductor to be the same as the ungrounded conductor). Show your calculations on the lines provided for Question 7 at the end of Part 1 of your project. ANSWERS AND CALCULATIONS FOR PART 1
National Electrical Code6
Answer to Question 6: Largest Motor Demand Load ______________________________ ____________________________________________________________ Answer to Question 7: Total Demand ____________________________________________ Minimum Service Size ____________________________________ Minimum Size Ungrounded Conductor ____________________ Minimum Size Grounding Electrode Conductor ____________ PART 2: RESIDENTIAL ROOM WIRING
Now that you’ve completed your load calculations and determined service size for a single-family dwelling, you’ll move to Part 2 of this project, which will examine the wiring requirements for 3 basic residential room types: general living space (living rooms, dens, family rooms), a kitchen, and a bathroom.
General Living Space
To begin Part 2 of your project, you’ll examine some general living space, one of the most basic wiring assignments in a home. Figure 1 illustrates some wiring that’s found in a typical living room. Study this diagram carefully and review the NEC codes that apply to this type of room. Note that several outlets are shown in Figure 1. These outlets are typically used for lighting and simple appliances, such as entertainment systems and personal computers. The placement of the outlets in the room is important. Once you’ve reviewed the NEC articles that apply to this room, answer the following questions.
Question 8: Which article of the NEC describes the proper placement of outlets in this type of room? ____________________________________________________________ Question 9: Part 1: According to the NEC, what is the maximum wall space that’s allowed between two adjacent outlets? ____________ Part 2: How large must a wall space be to require an outlet? ____________ Part 3: Should an outlet located at 7-feet up the wall from the floor, used to power a light fixture, be included in wall space requirement? ____________________________________________________________ Question 10: If the outlets in this room are s
Customer reply replied 1 year ago
Question 10: If the outlets in this room are supplied by a single 15A or 20A circuit, what is the maximum current that can be supplied (in amps) to a cord-and plug connected load? ____________________________________________________________
S
LIVING ROOM
L
CLOSET
FIGURE 1—Refer to this diagram while you’re working on questions related to the general living space.
Question 11: Look at the items listed in Table 1. Indicate which items are considered to be wall space by the NEC, and which items aren’t considered to be wall space. (Place an “X” in the appropriate column next to each item.)
Question 12: Part 1: In Figure 1, note that a switch is located close to the door. This switch operates an overhead light fixture. This arrangement is a requirement of the NEC. Which article of the NEC covers this regulation for a room of this type? ____________ Part 2: Other than the switch shown in Figure 1, what alternative way can be used to meet the NEC requirement? ____________ Question 13: If the branch circuits supplying the receptacles in the figure are rated at 20 A, what is the minimum ampacity rating of the conductors in the branch circuit? ____________________________________________________________ Question 14: How many branch circuits that supply the room shown in Figure 1 are required to be GFCI protected according to the NEC? ____________________________________________________________
National Electrical Code8
Table 1
Item
Considered to Be Wall Space
Not Considered to Be Wall Space
Fireplace
Fixed glass panel
Sliding segment of glass door
Door opening
Bar-type counter
Wall space less than 1 foot wide
Wall space 3 feet wide
Doorway
Fixed cabinet
Kitchen
Now, you’ll apply your knowledge of the NEC to a simple kitchen layout. Figure 2 shows some wiring in a typical kitchen found in a single-family dwelling. Electrical circuits in kitchens supply current to small appliances, electric ranges, dishwashers, and refrigerators; as well as lighting and general branch-circuit outlets. The NEC is very specific about the installation of wiring in kitchen areas. Study the wiring carefully in Figure 2 and look up the codes that apply to this situation in your NEC codebook. Then, answer the following questions.
Question 15: What section of the NEC covers the use of GFCI-protected outlets in a residential kitchen? ____________________________________________________________ Question 16: How many of the outlets shown in Figure 2 are required to be GFCI protected by the NEC? Identify the location of the outlets you selected on the figure. ____________________________________________________________ Question 17: What is the maximum distance that can separate the two outlets located to the right of the sink in the figure? ____________________________________________________________
ISLAND
KITCHEN
S4
S4
S3
TL
L
S3
REF
FIGURE 2—Refer to this  diagram when you’re working on questions related to the kitchen.
National Electrical Code10
Question 18: The outlets along the countertop are to be used for small appliances. What is the minimum number of branch circuits that would be needed to supply just these small-appliance outlets? ____________________________________________________________ Question 19: Part 1: What is the maximum distance (in feet) that the receptacle intended for the refrigerator can be from that appliance? ____________ Part 2: Name two common kitchen appliances that may require receptacle locations to be closer than required by 210.50 due to restrictions on cord lengths? ____________ Question 20: What is the minimum circuit protection (in amps) and wire size needed for each of the required smallappliance circuits? ____________________________________________________________ Question 21: In Figure 2, note that an electrical outlet is shown on the island in the kitchen area. Is this outlet required by the NEC, or does it represent an NEC violation? Briefly explain your answer. ____________________________________________________________ Question 22: Looking again at the island counter in the kitchen. If the countertop above the outlet was extended 12 inches beyond the base of the cabinet to allow bar-stool seating at the counter, would that change the NEC status of the outlet? Briefly explain your answer. ____________________________________________________________ Question 23: Suppose that a built-in dishwasher is to be installed in this kitchen. Does the NEC allow the dishwasher to be connected to the existing small-appliance circuits? ____________________________________________________________ Question 24: Can any of the receptacles required for the countertop space be mounted in the actual countertop? Cite an NEC section and condition to support your answer. ____________________________________________________________
Question 25: Does the NEC allow the lighting circuit for a kitchen to be attached to the small-appliance circuits? ____________________________________________________________ Questi
Customer reply replied 1 year ago
Question 25: Does the NEC allow the lighting circuit for a kitchen to be attached to the small-appliance circuits? ____________________________________________________________ Question 26: What is the maximum height that the outlets on either side of the sink can be installed above the countertop surface? ____________________________________________________________ Question 27: If the distance between the outlets on either side of the range in Figure 2 is less than 4 feet, are both outlets required per the NEC? Briefly explain your answer. ____________________________________________________________
Bathroom
You’ve worked through the general living area and the kitchen, and next you’ll look at the electrical wiring of a small residential bathroom. Figure 3 shows some wiring that’s to be installed in a bathroom. Study the wiring shown in the figure carefully, and review the NEC articles that apply in these situations. Once you’ve reviewed the appropriate articles, answer the following questions about this wiring diagram.
S S
L
FIGURE 3—Refer to this  diagram while you’re working on questions related to the bathroom.
National Electrical Code12
Question 28: What section of the NEC covers the use of GFCI-protected outlets in a residential bathroom? ____________________________________________________________ Question 29: How many of the outlets shown are required to be GFCI protected by the NEC? Circle your selections (if any) on Figure 3. ____________________________________________________________ Question 30: In what situation would the NEC allow any one of the outlets in this bathroom to supply power to an outlet in another room? ____________________________________________________________ Question 31: The receptacle near the basin in figure can be mounted on the countertop and, if a listed assembly, in the countertop. In what position may the receptacle not be mounted? ____________________________________________________________ Question 32: Looking again at the receptacle near the basin. What is the maximum distance the outlet can be away from the outside edge of the basin? ____________________________________________________________ Question 33: You’re rewiring the bathroom in Figure 3 as part of a remodeling project. The customer requests a GFCI receptacle on the back wall of the bathtub area, 5-feet from the top edge of the tub. Should you comply with the customer request? Site an NEC section to support your answer. ____________________________________________________________ Question 34: Does the NEC allow the lighting circuit in the bathroom area to be connected to the same circuit as the outlet receptacles? ____________________________________________________________
PART 3: BRANCH CIRCUIT SIZING
You’ve had a chance to test your skills at load calculations and service sizing, as you’ve just completed your evaluation of some basic room wiring. The next important skill you’ll practice is the proper sizing of the various branch circuits that feed specialized equipment such as ranges, and water heaters. In Part 3 of your project, you’ll determine the proper size of the branch circuits for three wiring scenarios involving cooking equipment. As you work through this exercise, please show all of your calculations on the calculation sheet at the end of Part 3. To receive credit for the questions, you must show exactly how you arrived at each solution. (Use scrap paper for preliminary calculations, if you need to, before you transfer your final calculations to the calculation sheet at the end of Part 3.) Example 1: Suppose that you’re working in a home that has a 15 kW oven that operates on 240 V. The oven is on a branch circuit by itself, as shown in Figure 4.
Question 35: What is the demand load for this circuit? (Show all of your calculations on the calculation sheet at the end of Part 3.) ____________________________________________________________
13
15 kW OVEN
PANEL BOX
FIGURE 4—Diagram for Example 1
Question 36: What size TW copper conductor should be used for the branch circuit? (Show all of your calculations on the calculation sheet at the end of Part 3.) Example 2: Suppose that you’re working in a kitchen that contains one 8 kW counter-mounted cooking unit and two 6 kW wall-mounted ovens. All three appliances are served by the same 240 V branch circuit. This situation is illustrated in Figure 5.
Question 37: What would be the demand load for this branch circuit? (Show all of your calculations on the calculation sheet at the end of Part 3.) Question 38: What is the minimum-size TW copper conductor that should be used for this branch circuit? (Show all of your calculations on the calculation sheet at the end of Part 3.) Example 3: Suppose that you’re working in a building that contains commercial kitchen equipment. The kitchen contains three 3 kW ovens, a 20 kW water heater, and a 3 kW deep fryer, as shown in Figure 6.
National Electrical Code14
8 kW COOKTOP
6 kW O
Customer reply replied 1 year ago
Answer to Question 37: ____________________________________ Show all calculations to determine the demand load for Question 37: ____________________________________________________________ ____________________________________________________________ Answer to Question 38: ____________________________________ Show all calculations to determine the wire size for Question 38: ____________________________________________________________ ____________________________________________________________ Answer to Question 39: ____________________________________ Show all calculations to determine the demand load for Question 39: ____________________________________________________________ ____________________________________________________________ PART 4: DETERMINING RECEPTACLE LOCATIONS
In this exercise, you’ll evaluate the floor plan for general living space in a typical home and determine the proper locations for the electrical outlets in the room. The NEC covers not only the electrical wiring of devices, but also (in many cases) the proper location for each device. Look at the living room shown in Figure 7. Imagine that you want to install in this room the minimum number of outlets required by the NEC. To complete the exercise, you’ll need to determine the minimum number of outlets needed for this room, and indicate the correct location where they should be installed in the room. You’ll mark the location of the outlets directly on Figure 7 in your project booklet.
To receive full credit for this exercise, you’ll need to do the following four things: 1. Indicate the location of each outlet in the figure by using the appropriate symbol 2. Indicate the distance that the outlet should be placed along the adjoining wall 3. Show how the branch circuit(s) would be connected 4. Indicate the proper spacing between outlets to meet NEC code requirements
3 ft 3 ft
7 ft
5 ft
4 ft
16 ft
FIREPLACE
4 ft
8 ft
4 ft
DOORWAY
GLASS SLIDER
GLASS FIXED
5 ft5 ft
FIGURE 7—Mark this diagram with receptacle locations and symbols.
Keep in mind that there are several different ways that this job can be done correctly. However, remember that you’re trying to install the minimum number of outlets. Therefore, you may have to try several different patterns to determine which configuration uses the minimum number of outlets. (Try sketching your ideas on scrap paper first; then, mark your final answers directly on Figure 7.) PART 5: NEC CODE VIOLATIONS
Part 5 of your NEC project will be similar to previous exercises in that you’ll be asked to evaluate simple electrical wiring diagrams. However, these diagrams will contain NEC violations. It will be your job to locate and identify the code violations. For example, suppose that you’re looking at a kitchen wiring diagram and notice that GFCI outlets weren’t placed near the sink. Well, the NEC requires that any outlet near water must be fitted with a GFCI outlet for protection from electrical shock. For the exercise, you would recognize that this installation violates the NEC; you would then describe the violation and reference the article or section of the NEC that supports your answer. The best approach to completing this exercise is to look over the illustrations in the project very carefully, paying attention to each and every detail. Then, use your knowledge of the NEC to check each circuit shown. Checking each circuit in an organized manner is the fastest and easiest way to complete the project. Now, you’re ready to begin this part of your project. Carefully study the wiring diagrams shown in Figures 8 through 12. At least one NEC violation is shown in each diagram. Identify each violation, and then describe the violation in Table 2. You’ll also need to indicate which article of the NEC is involved in the violation.
National Electrical Code18
To be sure that you understand how this exercise works, one example has been completed for you in the table. Figure 8 shows a typical residential bathroom. As you can see in the figure, the outlet receptacle next to the basin isn’t GFCI protected. This is a violation of the NEC. (Article 210.8(A) (1) indicates that all electrical outlets in bathroom areas must have GFCI protection.) So, you would describe the problem as shown in the first line of Table 2. Question 40: Review the figures, note all NEC violations in each one, and determine which NEC article has been violated. Use this information to complete the remainder of Table 2. ____________________________________________________________
L
S S
FIGURE 8—Note any NEC violations in Table 2.
Table 2 Figure Number Description ofthe NEC Violation NEC Article Violated 8 OutletnotGFCIprotected Article 210.8(A)(1)
9
10
11
12
National Electrical Code20
CLOSET
BEDROOM #3
14/2 15 A 120 V
6 ft
8 ft 8 ft
6 ft
8 ft8 ft
FIGURE 9—Note any  NEC violations in Table 2.
GFCI
S
S
GFCI
12/2 20 A 120 V
L
L
BATH #1
BATH #2
FIGURE 10—Note any  NEC violations in Table 2.
Customer reply replied 1 year ago
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