Protect Your Security Equipment

1.

Which statement is not true? Low-voltage suspended ceiling power distribution systems _____.

A.

Are not permitted to be used in residential installations
B.

Cannot be installed in damp or wet locations
C.

Cannot be in concealed locations
D.

Shall not be installed where subject to corrosive fumes or vapors

Correct Answer
A. Are not permitted to be used in residential installations

Explanation
NFPA 70, 2017 392.10(3)

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2.

Which of the following NEMA enclosure types does not protect against ingress of water, dripping and light splashing?

A.

1
B.

4
C.

6
D.

13

Correct Answer
A. 1

Explanation
NEMA enclosure type 1 does not protect against the ingress of water, dripping, and light splashing. NEMA 1 enclosures are designed for indoor use and provide basic protection against dust, falling dirt, and non-corrosive liquids. However, they do not have any specific protection against water ingress, making them unsuitable for outdoor or wet environments.

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3.

The only enclosure type that protects against ingress of water when temporarily submerged is type _____.

A.

2
B.

4
C.

6
D.

6P

Correct Answer
D. 6P

Explanation
The correct answer is 6P because the "P" in the enclosure type indicates that it is designed to protect against water ingress when temporarily submerged. The other enclosure types (2, 4, and 6) do not have this specific water protection feature.

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4.

A device having a solid protection IP rating of 6 provides what type of protection?

A.

Limited ingress of dust permitted
B.

Protects against solid object greater than 1.0 mm
C.

Strong jets of water
D.

Dust tight, zero ingress of dust permitted

Correct Answer
D. Dust tight, zero ingress of dust permitted

Explanation
A device with a solid protection IP rating of 6 provides dust tight protection, meaning that zero ingress of dust is permitted. This rating indicates that the device is completely sealed and protected against any dust particles entering it.

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5.

NEMA stands for _____.

A.

National Electrical Manufacturer’s Association
B.

National Electrical Mechanical Association
C.

National Enclosure Measuring Agency
D.

None of the above

Correct Answer
A. National Electrical Manufacturer’s Association

Explanation
NEMA stands for National Electrical Manufacturer’s Association. This organization is responsible for setting standards and promoting the development of electrical equipment and systems in the United States. They work with manufacturers, government agencies, and other stakeholders to ensure the safety, reliability, and efficiency of electrical products.

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6.

The IP and NEMA ratings that provide for protection against ingress of water from long periods of submersion are _____.

A.

13 and 6
B.

6 and 6
C.

6P and 8
D.

0 and 0 (zero and zero)

Correct Answer
C. 6P and 8

Explanation
The IP rating system is used to classify the degree of protection provided by an enclosure against the ingress of solid objects and water. The first digit in the IP rating represents the level of protection against solid objects, while the second digit represents the level of protection against water. In this case, the correct answer is 6P and 8. The "6P" rating indicates that the enclosure is dust-tight and can withstand powerful water jets, while the "8" rating indicates that the enclosure is suitable for continuous immersion in water under specified conditions.

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7.

The IP ratings designation contains two digits. What does each digit represent?

A.

First digit, liquid protection; second digit, solid protection
B.

Each number is one of 99 possible ratings on the list
C.

First digit, solid protection; second digit, liquid protection
D.

First digit, attack protection; second digit, penetration of either liquids of solids

Correct Answer
C. First digit, solid protection; second digit, liquid protection

Explanation
The IP ratings designation contains two digits. The first digit represents the level of solid protection provided by the device, while the second digit represents the level of liquid protection.

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8.

Surface nonmetallic raceways are permitted to be used outdoors for low voltage wiring such as alarm wires, CCTV and other communications wiring.

A.

True
B.

False

Correct Answer
B. False

Explanation
NFPA 70, 2017, 388.10(1)

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9.

Low-voltage suspended ceiling power distribution systems are permitted for equipment capable of a maximum voltage operation of _____ dc.

A.

24
B.

30
C.

60
D.

90

Correct Answer
C. 60

Explanation
NFPA 70, 2017, 393.10(1)

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10.

An IP 66 rating provides what type of protection?

A.

Dust tight and strong jets of water with limited ingress
B.

Limited ingress of dust, water splashed from all directions
C.

Penetration of a solid object greater than 2.5 mm
D.

Limited ingress of dust and strong jets of water with limited ingress

Correct Answer
A. Dust tight and strong jets of water with limited ingress

Explanation
An IP 66 rating provides protection against dust tight conditions, meaning that it is completely protected against the entry of dust. It also provides protection against strong jets of water with limited ingress, indicating that it can withstand powerful water jets from any direction without allowing water to enter in a harmful amount.

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11.

Which of the following is permitted to be used as an equipment grounding conductor?

A.

EMT
B.

ENT
C.

RTRC
D.

LFNC

Correct Answer
A. EMT

Explanation
NFPA 70, 2017, 358.60

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12.

“The practical safeguarding of persons and property from hazards arising from the use of electricity” is the purpose stated in which NFPA code?

A.

1
B.

70
C.

72
D.

101

Correct Answer
B. 70

Explanation
NFPA code 70, also known as the National Electrical Code (NEC), is the correct answer. This code specifically focuses on the practical safeguarding of persons and property from hazards arising from the use of electricity. It provides guidelines and standards for the installation and maintenance of electrical systems to ensure safety. The purpose of NFPA code 70 is to minimize the risk of electrical fires, shocks, and other electrical hazards, making it an essential reference for electrical professionals and building owners.

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13.

Which NEMA enclosure provides protection against corrosive agents?

A.

4 and 4X
B.

6 and 6P
C.

4X and 6
D.

4X and 6P

Correct Answer
D. 4X and 6P

Explanation
NEMA enclosure 4X provides protection against corrosion, while NEMA enclosure 6P provides protection against corrosion as well as temporary submersion in water. Therefore, the combination of 4X and 6P enclosures would provide the highest level of protection against corrosive agents.

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14.

Which NEMA rating does not provide for protection against ingress of solid foreign objects such as circulating dust, lint, or fibers?

A.

1, 2 and 3
B.

12, 12x and 13
C.

2, 4 and 5
D.

1, 2 and 5

Correct Answer
D. 1, 2 and 5

Explanation
NEMA rating 1, 2, and 5 do not provide protection against the ingress of solid foreign objects such as circulating dust, lint, or fibers. These ratings are not designed to prevent the entry of small particles and are therefore not suitable for environments where dust or fibers may be present. NEMA ratings 12, 12x, and 13, on the other hand, do provide protection against the ingress of solid foreign objects and are suitable for environments where dust or fibers may be present.

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15.

Where damage to remote-control circuits of safety-control equipment would introduce a hazard, all conductors of such remote-control circuits shall be installed in all of the following except _____.

A.

MI cable
B.

EMT
C.

FMC
D.

RNC

Correct Answer
C. FMC

Explanation
NFPA 70, 2017, 725.31(B)

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