|
1. |
300.6(B) Revised to require supplementary corrosion protection for aluminum metal conduits and equipment encased in concrete or in direct contact with the earth.
Aluminum Metal Equipment
Aluminum raceways, cable trays, cablebus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, elbows, couplings, nipples, fittings, supports, and support hardware embedded or encased in concrete or in direct contact with the earth shall be provided with supplementary corrosions protection.
Question: Aluminum conduit in direct contact with the earth or encased in concrete is required to have _________________ .
|
|
|
|
|
|
|
|
|
a)
|
supplementary corrosions protection
|
|
b)
|
nonmetallic sleeves
|
|
c)
|
a steel coating
|
|
|
|
|
|
|
|
2. |
300.9 Raceways in Wet Locations Above Grade
Where raceways are installed in wet locations above grade, the interior of these raceways shall be considered to be a wet location. Insulated conductors and cables installed in raceways in wet locations above grade shall be listed for wet locations. This generally requires that conductor insulations with a “W” are required. For example: XHHW, THWN, RHHW, are listed for wet locations.
When using Class 2 cables, a direct burial type cable may be required since some Class 2 and 3 cables are not listed for wet locations only, but are listed for direct burial which includes the wet location test.
Question: Conductors and cables installed in raceways located above grade in a wet location shall be listed for __________ according to 310.8(C).
|
|
|
|
|
|
|
|
|
a)
|
damp locations
|
|
b)
|
wet locations
|
|
c)
|
direct burial
|
|
|
|
|
|
|
|
3. |
300.11(A(2) Non Fire Rated Assemblies
A new revision requires independent means of support for raceways and permitted wiring methods and permits this means of support to be attached to the ceiling support assembly.
Question: Support wires installed specifically for supporting wiring methods above non fire rated ceiling assembly are _______ to be attached to the assembly.
|
|
|
|
|
|
|
|
|
a)
|
required
|
|
b)
|
permitted
|
|
|
|
|
|
|
|
4. |
300.12 Exception No. 2 Mechanical Continuity - Raceways and Cables
Exception No. 2: Raceways and cables installed into the bottom of open bottom equipment such as switchboards, motor control centers, and floor or pad mounted transformers shall not be required to be mechanically secured to the equipment.
Question: Raceways and cables installed into the bottom of open bottom equipment such as switchboards, motor control centers, and floor or pad mounted transformers _________________ to be mechanically secured to the equipment.
|
|
|
|
|
|
|
|
|
a)
|
shall be required
|
|
b)
|
shall not be required
|
|
|
|
|
|
|
|
5. |
Table 300.50 Note 3 and Footnote d
New provisions for depth reduction for industrial establishments where 2 inch concrete cover is used.
Note 3 In industrial establishments where conditions of maintenance and supervision ensure qualified persons will service the installation the minimum cover requirements for other than rigid metal conduit and intermediate metal conduit shall be permitted to be reduced 6 inches for each 2 inches of concrete or equivalent that is placed entirely within the trench over the underground installation.
Question: In industrial establishments for other than rigid metal conduit and intermediate metal conduit where qualified persons service the installation the minimum cover requirements in Table 300.50 are permitted to be reduced ______ for each 2 inches of concrete or equivalent placed in the trench over the underground installation.
|
|
|
|
|
|
|
|
|
a)
|
2 inches
|
|
b)
|
12 inches
|
|
c)
|
6 inches
|
|
|
|
|
|
|
|
6. |
Table 300.50 Note 3 Footnote d
Warning ribbon shall be used for underground direct buried cables and located no less than 12 inches above the cable.
d. Underground direct buried cables that are not encased or protected by concrete and are buried 30 inches or more below grade shall be identified by a warning ribbon that is placed in the trench no less than 12 inches above the cables.
Question: Underground direct buried cables that are not encased or protected by concrete and are buried 30 inches or more below grade shall be identified by a warning ribbon that is placed in the trench _________above the cables.
|
|
|
|
|
|
|
|
|
a)
|
no less than 12 inches
|
|
b)
|
no less than 6 inches
|
|
c)
|
within 12 inches
|
|
|
|
|
|
|
|
7. |
310.6 Shielding
Conductors with a solid dielectric insulation operating above 2000 volts in permanent installations shall be shielded and shall have the metallic insulation shield connected to a grounding electrode, grounding electrode conductor, or the grounding busbar in the equipment.
Question: Conductors with a solid dielectric insulation operating above 2000 volts in permanent installations shall be shielded and shall have the metallic insulation shield connected to _______________________________________ .
|
|
|
|
|
|
|
|
|
a)
|
a grounding electrode,
|
|
b)
|
a grounding electrode conductor,
|
|
c)
|
the grounding busbar
|
|
d)
|
either a, b, or c
|
|
|
|
|
|
|
|
8. |
310.7 (NEW) Direct Burial Conductors Exception No. 2 Airfield lighting cable used in series circuits that are rated 5000 volts and are powered by regulators shall not be required to be shielded.
(NEW) fine Print Note: Federal Aviation Administration Advisory Circulars provide additional practices and methods for airport lighting.
Question: Airfield lighting cable used in series circuits that are rated 5000 volts and are powered by regulators __________be required to be shielded.
|
|
|
|
|
|
|
|
|
a)
|
shall not
|
|
b)
|
shall
|
|
|
|
|
|
|
|
9. |
310.15(B)(2)(c) NEW Table added for adjusting temperature for derating of conductors installed in conduits above roofs exposed to direct sunlight.
Where conductors or cables are installed in conduits exposed to direct sunlight on or above roof tops, the adjustment factors shown in Table 310.15(B)(2)(c) shall be added to the outdoor temperature to determine the applicable temperature for application of the ambient derating factors shown in Tables 310.16 and 310.18.
Question: When conduits are installed where subject to direct sunlight the conductors or cables are subject to _____________ that are shown in Table 310.15(B)(2)(c).
|
|
|
|
|
|
|
|
|
a)
|
adjustments in temperature
|
|
b)
|
derating factors
|
|
|
|
|
|
|
|
10. |
312.4 Repairing Noncombustible Surfaces. The words plaster, drywall, and plasterboard have been replaced by "noncombustible surfaces" so this section applies to other types of noncombustible surfaces such as masonry and tile.
Noncombustible surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than 1/8 inch at the edge of the cabinet or cut out box that uses a flush type surface mount cover.
Question: Gaps or open spaces greater than ________ at the edge of the cabinet or cut out box that uses a flush type surface mount are not allowed.
|
|
|
|
|
|
|
|
|
a)
|
1/4 inch
|
|
b)
|
1/16 inch
|
|
c)
|
1/8 inch
|
|
|
|
|
|
|