true/ false & Phil in the blank
Where internal bonding means are provided between all entries, nonmetallic boxes shall be permitted to be used with metal raceways or metal-armored cables.
True
Nonmetallic boxes can be used with metal raceways or metal-armored cables if internal bonding means are provided between all entries, ensuring proper grounding and safety.
What is the maximum allowable length for screws to extend when attaching a cover to a box?
3/8 inch
Adjustment factors shall not apply to conductors in raceways having a length not exceeding _____.
24 inches
This article covers general requirements for conductors rated up to and including 2000V and their type designations, insulations, markings, mechanical strengths, ampacity ratings, and uses.
What is Article 310
Article 310 covers the general requirements for conductors rated up to and including 2000V, including their type designations, insulations, markings, mechanical strengths, ampacity ratings, and uses.
What is the ampacity of a #3/0 THWN conductor installed in an ambient temperature of 104 degrees Fahrenheit?
176 amps
#3/0 THWN = 200a x .88 (104 degrees Fahrenheit) T.310.15(B)(2)(A) = 176a
Grounded conductors shall be permitted to be sized _____ than the ungrounded conductors.
Smaller
Grounded conductors are permitted to be sized smaller than ungrounded conductors if they meet the requirements outlined in NEC sections 220.61 and 230.42 for service conductors or 215.2 and 220.61 for feeder conductors.
Boxes, conduit bodies, outlet box hoods, and fittings installed in wet locations shall be _____ for use in wet locations.
Listed
Boxes, conduit bodies, outlet box hoods, and fittings installed in wet locations must be listed for use in wet locations to ensure compliance with safety standards.
Insulated conductors or cables used where exposed to direct rays of the sun shall be _____ as being sunlight resistant.
Listed
Conductors or cables exposed to direct sunlight must be listed as being sunlight resistant to ensure they can withstand environmental conditions without degradation.
When using cable assemblies of Type NM or UF, it is essential that the sheath extends at least _____ inside the box and beyond the end of any cable clamp.
1/4 inch
How many #4 XHHW conductors can you install in a 2" flexible metal conduit?
16
Table 4 - 1.307 sq in.
Table 5 - .0814 sq in.
1.307/.0814 = 16 conductors
A _____ is an enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the enclosure.
Cutout Box
For installations within walls or ceilings finished with noncombustible materials, ensure that the front edge of the box, plaster ring, extension ring, or listed extender is set back no more than _____ from the finished surface.
1/4 inch
Insulated conductors or cables used where exposed to direct rays of the sun shall be _____ as being sunlight resistant.
Listed
When splicing conductors, the distance from the entry of the raceway into the box to the opposite wall must be a minimum of _____ times the size of the largest raceway.
6
The National Electrical Code specifies that the minimum distance for splicing conductors is six times the size of the largest raceway to ensure proper spacing and avoid damage to conductor insulation.
The ampacity of a copper #10 THWN-2 is ____ when there are three conductors in the conduit and the ambient temperature is 70 degrees Fahrenheit
41.6 amps
T.310.15(B)(16) = 40 amps X 1.04 correction factor = 41.6a.
Wiring methods that feature removable covers, such as wireways, multioutlet assemblies, and surface raceways, do not require the use of a(n) _____.
Box
Power monitoring or energy management equipment shall either be identified as a field installable accessory as part of the _____ equipment or be a _____ kit evaluated for field installation in switch or overcurrent device enclosures.
listed
In the designation 'THWN' for conductor insulation, what does the 'W' indicate it is permitted for?
Wet or damp locations
The 'W' in 'THWN' indicates that the conductor is suitable for use in wet or damp locations, as specified in the National Electric Code.
This article covers general requirements for conductors rated up to and including 2000V and their type designations, insulations, markings, mechanical strengths, ampacity ratings, and uses.
Article 310
3" Intermediate Metal Conduit has a total square inch area of _______ square inches.
7.922
Table 4 Total Area 100% = 7.922 sq in.
This article covers the installation and use of all boxes and conduit bodies used as outlet, device, junction, or pull boxes, depending on their use, and handhole enclosures.
This article covers the installation and use of all boxes and conduit bodies used as outlet, device, junction, or pull boxes, depending on their use, and handhole enclosures.
Boxes used at luminaire or lampholder outlets in or on a vertical surface shall be _____ on the interior of the box to indicate the maximum weight of the luminaire that is permitted to be supported by the box if other than 50 lb.
Identified and Marked
The cross-sectional area of a #1 Type A Rigid PVC conduit is _______ sq in.
1.084
Table 4 @ 100% = 1.084
What is the ampacity of four #4/0 THWN copper current carrying conductors in a raceway installed through an ambient temperature of 45 degrees Celsius?
150.9 amps
#4/0 THWN = 230a X 80% (T.310.15(B)(3)(a) = 184a X .82 (45 degrees Celsius) = 150.88a
Determine the allowable ampacity of 13 - #12 THHN conductors in a raceway, when passing through an area where the ambient temperature is 40 degrees Celsius.
13.65 amps
#12 THHN = 30a x 50% (T.310.15(B)(3)(a) = 15a x .91 (40 degrees Celsius) = 13.65a