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物理代写 Question 1: Total General Lighting and Receptacle Load

General lighting load = 3,800 Sq. ft. x 3 VA = 11400 VA

Small…

Question 1: Total General Lighting and Receptacle Load

General lighting load = 3,800 Sq. ft. x 3 VA = 11400 VA

Small-appliance branch circuit load   = 3 Appliance Circuits x 1500 VA = 4500 VA

Laundry branch circuit load.  = 1 Laundry Circuit x 1500 VA= 1500 VA

Total General Lighting and Receptacle Load  = 11400 + 4500 + 1500 = 17,400 VA

Applying demand factors to the general lighting load.

First 3000 VA at 100% = 3000 VA

Remainder at 35% = (17,400 – 3,000) x 0.35 = 5040 VA

TOTAL General Lighting and Receptacle Load = 3000 + 5040 = 8040 VA

Question 2: Fixed-in-Place Appliance Load Graded Project代写

Water heater 28 kVA = 28000 VA

Dishwasher =1,200 VA

Food Disposal  =1,200 VA

Attic Fans  =1,500 VA

Total =31,900 VA

75% of total; for 4 or more appliances = 0.75 x31900 = 23,925 VA

Question 3: Dryer Load

Clothes Dryer: 5 Kw = 5000VA

Question 4: Cooking Equipment Demand Load

12kw demand factor is 80%

Equipment demand load = 12 x 0.8 = 9.6 kW = 9600 VA

Question 5: HVAC Load Determine the total AC loads for the HVAC system in this residence.

3.5 Ton AC system 240 V, 17.9 , Air handler 3.3 A

Load due to AC system = V x I_ac

=240 x 17.9

=4296 VA

Load due to air handler = V x I_ac

=240 x 3.3

= 792 VA

Total HVAC load =4296 + 792

=5088 VA

Question 6: Largest Motor Load Determine the largest motor load for this residence. 物理代考

For the largest motor take food disposal volt-amps x 25% = 1200 x 0.25 = 300 VA 

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).

TOTAL Volt-Amp Demand Load: = 23,925+5000+9600+5088+300 = 43913 VA

Min. Amperes for service = Total VA / voltage = 43913/240 =182.97 a

Min. Size for service conductors/feeders. NEC 240-6. Use next standard size fuse or breaker = 200 A

Size of service and/or feeder conductors.  Use NEC 310-15(b) for the service conductors up to 400 A

Rating > 400 amps min. Size of conductors= 3/0 cu or 250 kcmil al

Min. Size of neutral conductor = no. 2 cu

Size of grounding electrode conductor 200 amp service with 3/0 service conductors, the size = 4 cu

Question 8: Which article of the NEC describes the proper placement of outlets in this type of room?

Article 210.

Question 9: Part 1: According to the NEC, what is the maximum wall space that’s allowed between two adjacent outlets? 

12 feet. 

Part 2: How large must a wall space be to require an outlet?物理学代写

2 feet

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?

YES

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? 物理学代写

20 Amps and not more than 125% of the load 

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.

 

Table 1
Item	Considered to Be Wall Space	Not Considered to Be Wall Space
Fireplace		X
Fixed glass panel	X
Sliding segment of glass door		X
Door opening		X
Bar-type counter	X
Wall space less than 1 foot wide		X
Wall space 3 feet wide	X
Doorway		X
Fixed cabinet		X

 

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? Graded Project代写

Article 210

Part 2: Other than the switch shown in Figure 1, what alternative way can be used to meet the NEC
requirement?

No other way

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?

3.1 Amp or Lower 

Question 14: How many branch circuits that supply the room shown in Figure 1 are required to be GFCI protected according to the NEC? Graded Project代写

= 4

Question 15: What section of the NEC covers the use of GFCI-protected outlets in a residential kitchen?

Article 210.8 

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.

7 Along cabinet and counter

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?

There is no restriction on the number of branch circuits

Question 19: Part 1: What is the maximum distance (in feet) that the receptacle intended for the refrigerator can be from that appliance? Graded Project代写

2 feet and in place appliances

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?

Electric cooker and Oven

Question 20: What is the minimum circuit protection (in amps) and wire size needed for each of the required small appliance circuits? 

38 Amp wire size would be 12

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?

No. It has to be that way.

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? .  Graded Project代写

No. It is under the same code

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?

No 

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.

Yes. Section 210.50

Question 25: Does the NEC allow the lighting circuit for a kitchen to be attached to the small-appliance circuits?

Yes

Question 26: What is the maximum height that the outlets on either side of the sink can be installed above the countertop surface? Graded Project代写

24 to 48 inches

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.

No. Due to limited space.

Question 28: What section of the NEC covers the use of GF protected outlets in a residential bathroom?

Section 210.8

Question 29: How many of the outlets shown are required to be GFCI protected by the NEC

All outlets

Question 30: In what situation would the NEC allow any on of the outlets in this bathroom to supply power to an outlet to another room? . Graded Project代写

None

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?

Sideways

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?

2 feet

Question 33: You’re rewiring the bathroom in Figure 3 as part of a remodeling project. The customer requests a GFC receptacle on the back wall of the bathtub area, 5-feet from the top edge of the tub. Should you comply with the custom request? Site an NEC section to support your answer.

No. Section 210.8 

Question 34: Does the NEC allow the lighting circuit in the bathroom area to be connected to the same circuit as the outlet receptacles?

No

Question 35: What is the demand load for this circuit? Graded Project代写

240 Volts

Question 36: What size TW copper conductor should be used for the branch circuit? 

6 gauge wire.

Question 37: What would be the demand load for this branch circuit?

240 V

Question 38: What is the minimum-size TW copper conductor that should be used for this branch circuit?

6 wire 3-phase

Question 39: What would be the demand load for all of these items? Graded Project代写

4,600 V

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
FIGURE NAME	Description of the NEC violation	NEC article violated
8	Outlet not GFCI protected	210.8
9	Outlet supplied by 15A instead of 20A branch circuit	210.11
10	Outdoor receptacle not GFCI protected	210.8
11	Wrong wall space requirement	210.12
12	Use of 15 A branch on an a outlet	210.11