CODE HUNTER — Listing, 2014 NEC

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1287

Questions

To play this game, you need a sharp eye, a quick mind and a 2014 National Electrical Code book.
(Fill-in-the-blank questions are looking for the exact word(s) used in the NEC.)

1) Use of the system employed by the listing organization allows the ___________ to identify a listed product.

A) Owner
B) Electrician
C) Qualified person
D) Authority having jurisdiction

2) Cables shall be concealed within walls, floors, or ceilings that provide a thermal barrier of material that has at least a __________ finish rating as identified in listings of fire-rated assemblies.

A) 15-minute
B) 1-hour
C) 2-hour
D) 3-hour

3) Where subject to exposure to __________, vapors, splashing, or immersion, materials or coatings shall either be inherently resistant to chemicals based on their listing or be identified for the specific chemical reagent.

A) Oil
B) Gasoline
C) Chemical solvents
D) Corrosive environments

4) Only fittings listed for use with LFMC shall be used.  _________ connectors shall not be concealed. Straight LFMC fittings shall be permitted for direct burial where marked.

A) Angle
B) Straight
C) Removable
D) Compression

5) Listed or labeled equipment shall be installed and used in accordance with any __________ included in the listing or labeling.

A) Tools
B) Diagrams
C) Instructions
D) Torque values

6) All luminaires, lampholders, and __________ shall be listed.

A) Lamps
B) Ballasts
C) Retrofit kits
D) Fixture wires

7) Where __________ or tinsel cord is approved for and used with a specific listed appliance or luminaire, it shall be considered to be protected when applied within the appliance or luminaire listing requirements.

A) Fixture wire
B) Flexible cord
C) Festoon wire
D) Multiconductor cable

8) An surge protective device (SPD) shall be a listed device.

A) True
B) False

9) If a combustible gas detection system is used as a protection technique in an industrial establishment, the equipment listing must be documented.

A) True
B) False

10) Informative Annex A contains a comprehensive list of all product standards used for listing electrical equipment specified in the NEC; any product standard not included in the list is not allowed for evaluation of equipment used in accordance with the NEC.

A) True
B) False

Bonus Question

[WpProQuiz 7]

 

Answers

1) D, Authority having jurisdiction. In Article 100, the definition for “Listed” identifies the requirements for a listed product or service. The listing organization must be acceptable to the authority having jurisdiction (AHJ), must maintain a published list of evaluated products, must perform periodic inspections or evaluations, and must state that the listed product or service meets appropriate standards or is suitable for a specific purpose. The Informational Note gives additional information to the AHJ about identifying listed products, including the statement in the question.

2) A, 15-minute. Section 334.10(3) indicates that within Types III, IV, and V construction (other than dwelling occupancies as covered in list items (1) and (2)), Type NM, NMC and NMS cables are permitted as long as they are concealed within the structure behind surfaces that provide at least a 15-minute finish rating. Type NM-B is the most commonly found version of this wiring method, and the “-B” indicates that the conductor insulation is rated for 90C as required in 334.112. Construction type descriptions can be found in Annex E of the NEC.

3) C, Chemical solvents. This language, found in 300.6(C)(2), applies to nonmetallic equipment, which is often used in corrosive and wet environments to prevent deterioration of enclosures. Corrosion costs the U.S. billions of dollars in the electrical industry; careful evaluation of the installed environment and choosing equipment and systems that resist corrosion are important steps for minimizing failures and increasing safety.

4) A, Angle. The sentence restricting angle connectors was the only requirement found in 350.42 in the 2011 NEC. In the 2014 NEC, two additional requirements were added. The first sentence was added to highlight the fact that connectors listed for LFMC are required, since many times PVC connectors were being used. The last sentence was added to indicate that straight LFMC connectors are allowed to be used for direct burial, but only if marked for the use.

5) C, Instructions. This requirement is found in 110.3(B). Qualified electrical testing laboratories evaluate equipment to determine whether it meets the requirements found in a product standard or other investigational document. The installation instructions associated with the equipment must be followed to ensure that the equipment will operate in the field the way it was intended by design and evaluated by testing.

6) C, Retrofit kits. The requirement in 410.6 Listing Required was updated to include “retrofit kit” since so many lighting upgrades are being performed to increase the energy efficiency of luminaires. A new definition for “Retrofit Kit” was added to Article 100: A general term for a complete subassembly of parts and devices for field conversion of utilization equipment.

7) B, Flexible cord. Found in 240.5(B)(1), this language states that the supply cord of a luminaire or appliance must be protected by branch-circuit overcurrent protection as indicated in the listing information. The language goes on to say that this requirement applies equally to portable and permanent luminaires. Flexible cords and tinsel cord requirements are found in Article 400.

8) A, True. Section 285.5 requires that surge protective devices (SPDs) be listed. Article 285 applies only to SPDs rated 1000 volts or less. SPDs are classified as Type 1, Type 2, etc., and each type has specific location and application restrictions.

9) A, True. Section 500.7(K) permits the use of a combustible gas detection system as a means of protection in industrial establishments with restricted public access and where the conditions of maintenance and supervision ensure that only qualified persons service the installation. Documentation must include the type of detection equipment, the listing, installation location(s), alarm and shutdown criteria, and calibration frequency.

10) B, False. Since Annex A is an informative annex, it is not a mandatory or enforceable part of the NEC. Its purpose is to provide information to code users as to which standards are used to list electrical products. At the beginning of the Annex, it is stated that: It is recognized that this list is current at the time of publication but that new standards or modifications to existing standards can occur at any time while this edition of the Code is in effect.