Exam: 006830rr – transformers and special locations

Exam: 006830RR – Transformers and Special Locations

 

1. With the exception of class 2 or class 3 transformers, if the disconnecting means for a transformer is not in sight of the transformer, the disconnecting means is required to be

A. lockable.

B. weatherproof.

C. moisture resistant.

D. bonded.

 

2. Two electricians are discussing guarding requirements for transformers. Electrician A says that a warning sign indicating the operating voltage of live parts on a transformer is required if the live parts are exposed. Electrician B says that dry-type transformers can be installed without an enclosure. Which of the following statements is correct?

A. Neither electrician is correct.

B. Both electricians are correct.

C. Only Electrician A is correct.

D. Only Electrician B is correct.

 

3. Which of the following is a NEC violation for wiring installed in a place of assembly?

A. Permanent wiring using AC cable containing an insulated EGC

B. Permanent wiring in nonmetallic raceway encased by one inch of concrete

C. Temporary wiring laid directly on the floor

D. Temporary wiring not protected by GFCIs

 

4. In Class II, Division 2, conditions fuses, switches, circuit breakers, and similar devices must be installed in enclosures that are

A. vapor proof.

B. airtight.

C. dust tight.

D. watertight.

 

5. A hazardous location in which flammable gases or vapors exist in sufficient quantities to cause an explosion, as defined by the NEC?

A. Class I

B. Unclassified

C. Class III

D. Class II

 

6. Two electricians are discussing hazardous locations. Electrician A says that hazardous location classifications are determined by the presence of gases, dust, or ignitable fibers. Electrician B says that division 2 conditions would not create a fire or explosion under normal circumstances. Which of the following statements is correct?

A. Both electricians are correct.

B. Neither electrician is correct.

C. Only Electrician A is correct.

D. Only Electrician B is correct.

 

 

 

 

 

7. Two electricians are discussing special requirements for health care facilities. Electrician A says that a nursing home is required to include an emergency system circuit. Electrician B says that GFCI outlets are not required in the bathroom area of some critical-care patient rooms. Which of the following statements is correct?

A. Both electricians are correct.

B. Neither electrician is correct.

C. Only Electrician B is correct.

D. Only Electrician A is correct.

 

8. Ignoring any exceptions, which of the following transformer types is not required to be installed in a vault?

A. Dry-type, indoor, rated over 35 kV

B. Dry-type, indoor, rated 1121/2 kVA or less

C. Oil-insulated, installed indoors

D. Nonflammable fluid-insulated, insulated rated over 35 kV

 

9. According to the NEC, conduit seals are required within _______ inches from a pressurized enclosure when the conduit is not pressurized in Class I, Division 1 protection systems.

A. 24

B. 30

C. 12

D. 18

 

10. To be in compliance with the NEC, transformer vaults must have a fire-resistance rating of _______hours and concrete floors that are at least _______ inches thick, unless protected by automatic sprinkler systems.

A. 2, 3

B. 1, 3

C. 3, 4

D. 4, 4

 

11. What hazardous location designation applies to facilities where flammable gases are handled, processed or used, but under normal circumstances there is not a threat of explosion?

A. Class II, Division 2

B. Class I, Division 1

C. Class I, Division 2

D. Class II, Division 1

 

12. What size primary fuse is required to protect a 5 kVA, 208 V, 3Φ transformer?

A. 17.5 A

B. 13.5 A

C. 15 A

D. 20 A

 

13. Two electricians are discussing transformers. Electrician A says that to insure proper ventilation, the required clearances can be found on the transformer nameplate markings. Electrician B says that exposed live parts on a transformer require the installation of a sign that indicates the operating voltage. Which of the following statements is correct?

A. Only Electrician A is correct.

B. Only Electrician B is correct.

C. Both electricians are correct.

D. Neither electrician is correct.

 

14. What article in the NEC would you reference to determine the wiring requirements for a local dinner theater?

A. Article 520

B. Article 525

C. Article 522

D. Article 530

 

15. Lighting fixtures used in Class III, Division 1 and Division 2 locations are required to be marked with the maximum lamp wattage that can be used without exceeding a fixture surface temperature of _______° F.

A. 165

B. 329

C. 453

D. 250

 

16. What is the T Code for equipment having a maximum surface temperature of 392°F?

A. T4

B. T3A

C. T3

D. T4A

 

17. What size maximum level of primary-only overcurrent protection is required for a 600-volt transformer with a primary current rating of 54 amperes?

A. 70

B. 60

C. 100

D. 50

 

18. All 15 A and 20 A, 125 V receptacles installed in a pediatric playroom in a health care facility must be _______ receptacles.

A. GFCI

B. tamper-resistant

C. nongrounding

D. standard

 

19. What is the maximum size fuse that may be used to protect a 60 kVA, nonsupervised transformer

having a 4,160 V primary and 5% impedance?

A. 35 A

B. 20 A

C. 30 A

D. 25 A

 

20. Which of the following is not a consideration when installing a LFLI transformer indoors?

A. Pressure relief vent

B. Automatic fire extinguishing system

C. Voltage rating

D. Building type

 

 

Order a unique copy of this paper
(550 words)

Approximate price: $22

Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

We value our customers and so we ensure that what we do is 100% original..
With us you are guaranteed of quality work done by our qualified experts.Your information and everything that you do with us is kept completely confidential.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

The Product ordered is guaranteed to be original. Orders are checked by the most advanced anti-plagiarism software in the market to assure that the Product is 100% original. The Company has a zero tolerance policy for plagiarism.

Read more

Free-revision policy

The Free Revision policy is a courtesy service that the Company provides to help ensure Customer’s total satisfaction with the completed Order. To receive free revision the Company requires that the Customer provide the request within fourteen (14) days from the first completion date and within a period of thirty (30) days for dissertations.

Read more

Privacy policy

The Company is committed to protect the privacy of the Customer and it will never resell or share any of Customer’s personal information, including credit card data, with any third party. All the online transactions are processed through the secure and reliable online payment systems.

Read more

Fair-cooperation guarantee

By placing an order with us, you agree to the service we provide. We will endear to do all that it takes to deliver a comprehensive paper as per your requirements. We also count on your cooperation to ensure that we deliver on this mandate.

Read more

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency