I forget but the third one YEAH
Change the measurement from mils to inches. (Round the FINAL answer to three decimal places.) 125 mils = ? inch
0.125
Change the measurement from mils to inches. (Round the FINAL answer to four decimal places.) 187.5 mils = ? inch
0.1875
Change the measurement from mils to inches. (Round the FINAL answer to one decimal place.) 500 mils = ?_ inch
0.5
What is the temperature correction factor for a cable that contains three current-carrying conductors with THHN insulation if the cable is run through an attic with an ambient temperature of 106°F?
0.87
Allowable ampacities of conductors found in Table 310.15(B)(16) are nwo based on an ambient temperature of 30°C with not more than three current-carrying conductors in which of the following types of installations?
1. Cable II. Directly buried in the earth III. Raceway
A service-entrance cable, Type SE, is terminated at a 2-pole circuit breaker in a garage. The conductors are 3 AWG copper conductors with insulation rated at 90°C. The circuit breaker terminations are labeled not to (exceed) 75°C. The allowable ampacity of the conductors is ? .
100 amperes
One inch is equal to ?.
1000 mils
The minimum size aluminum conductor as permitted by Section 310.106(A) for 600-volt building wire is a ?.
12 AWG
The minimum size copper-clad aluminum conductor as permitted by Section 310.106(A) for 600-volt building wire is a ?.
12 AWG
Convert the measurement to mils. 0.125 inch = ?_mils
125
What is the diameter in mils of a conductor with the cross-sectional area of 18,225 cmil?
135 mils
The minimum size copper conductor as permitted by Section 310.106(A) for 600-volt building wire is ?.
14 AWG
An installation consisting of 11 armored cables, Type AC, is bundled together and run through a ceiling for a distance of 46 feet. Each cable allowable ampacity for each of copper with THWN insulation. What is the contains two current-carrying conductors. The conductors are 12 AWG the current-carrying conductors?
15 amperes
Given the diameter in mils, calculate the circular mil area of the conductor. 125 mils = ? circular mils
15625
Using Table 310.15(B)(16), determine the allowable ampacity of the following conductors. They are all the same size and material, but each has a different type of insulation.
2 AWG Copper, THHN Insulation = 130 A 2 AWG Copper, THW Insulation = 115 A 2 AWG Copper, THWN Insulation = 115 A 2 AWG Copper, TW Insulation = 95 A
According to Table 310.15(B)(16), the ampacity of a 12 AWG copper conductor with THHN insulation is 30 amperes. In general, Section 240.4(D) does not allow the overcurrent protective device for a 12 AWG copper conductor to exceed ?.
20 amperes
The voltage rating of conductors covered by Table 310.15(B)(16) is 0 to ?.
2000 volt(s)
A raceway containing five current-carrying conductors is installed in an copper conductor with THWN attic with an ambient temperature of 106°F. Each conductor is a 10 AWG insulation. The allowable ampacity of each conductor will be ?. (Round the FINAL answer to two decimal places.)
22.96 amperes
A six-circuit panelboard is added to the existing service equipment in a dwelling unit. An 18-inch long EMT nipple is used to connect the subpanel to a junction box. The junction box is used to extend the length of the existing branch-circuit conductors, so they can reach their respective termination points in the new panelboard. The raceway contains twelve 12 AWG copper conductors with THWN insulation. Each of the 12 conductors is current-carrying. The allowable ampacity of each of the conductors is ?.
25 amperes
Given the diameter in mils, calculate the circular mil area of the conductor. 500 mils = ? circular mils
250000
Convert the measurement to mils. 0.25 inch = ? mils
250
What is the diameter in mils of a of 4,225 cmil? conductor with the cross-sectional area
65 mils
(T/F)Table 310.15(B)(17) applies to the single insulated conductor installed in free air where the heat generated within the conductor may be more easily dissipated than when enclosed in a raceway or cable jacket.
True
Where the edge of a bored hole in a framing member where a nonmetallic-sheathed cable passes through is less than 1 , inches from the nearest edge of the framing member, a steel ? at least 1/16 inch thick and of appropriate length and width shall be installed to cover the area of the wiring.
bushing or plate
A 6 AWG copper conductor is ? than a 10 AWG copper conductor.
larger
When the number of current-carrying conductors in a cable or raceway exceeds three, the allowable ampacity of each conductor found in Table 310.15(B)(16) shall be ? as shown in Table 310.15(B)(3)(a).
reduced
To find the cross-sectional area of a wire in circular mils, ? the diameter expressed in mils.
square
The letters kcmil stand for ?.
thousand circular mils
What is the definition of a mil-foot?
À wire one foot iong with a cross sectionai area of one circular mil (100%)
A 10-foot length of armored cable, Type AC, is installed in a basement between two surface-mounted handy-boxes. The minimum number of straps required on this installation of Type AC cable is ?.
3 (100%)
The ampacities listed in Table 310.15(B)(17) are based on an ambient air temperature of ? or 86°F.
30 °C
The minimum number of straps required on the following exposed installation of Type NM cable is ?.
4 (100%)
The radius of a 90° bend in nonmetallic sheathed cable shall not be less than ? times the cable diameter.
5
Three 8 AWG copper conductors with THW insulation are installed in a raceway. Each conductor is current-carrying. The allowable ampacity of each conductor is ?.
50 amperes
Armored cable is permitted to be installed as an unsupported fixture whip for lighting fixtures in an accessible ceiling when the fixture whip does not exceed ? in length, from the last point of support.
6 feet
An 8 AWG copper conductor with THHN insulation is installed overhead in free air. The conductor terminates at a lug that is marked with a temperature rating of 60°C. The conductor has a maximum allowable ampacity of ?.
60 amperes
An existing installation consists of a raceway containing three 6 AWG copper conductors with THHN insulation. Each of the conductors is current-carrying. If two additional 6 AWG copper current-carrying conductors with THHN insulation were added to the raceway, the adjusted ampacity of the conductors will be ?.
60 amperes
Armored cable installed in thermal insulation shall have conductors rated at 90°C. The ampacity of cable installed in these applications shall not exceed that of a ? rated conductor.
60 °C
Given the diameter in mils, calculate the circular mil area of the conductor. 25 mils = ? circular mils
625 (100%)
Convert the measurement to mils. 3/4 inch = ?_mils
750
A cable contains five current-carrying conductors. The allowable ampacity of each current-carrying conductor shall be reduced to ? of the maximum allowable ampacity permitted by Table 310.15(B)(16).
80 %
The ampacities listed in Table 310.15(B)(16) are based on an ambient air temperature of 30°C or ?.
86 °F (100%)
Type NM cable is required to be constructed with ? rated conductor insulation.
90 °C
Type UF cable is permitted to be installed as a substitute for nonmetallic- sheathed cable, provided the conductor insulation is rated at ?.
90 °C
(T/F) Type UF cable is permitted to be used for service-entrance cable.
False
(T/F) Type USE service-entrance cable is identified for use underground and is constructed with a moisture resistant and flame-retardant covering.
False
(T/F) Where run parallel to the sides of floor joists in accessible attics, Type NM cable shall be protected by substantial guard strips that are at least as high as the cable.
False
Type UF cable is permitted to be installed in which of the following locations or applications?
Underground as direct-burial cable
A run of type AC cable passes through holes bored in wooden framing members. The distance from the edge of the framing member to the cable measures one inch. Is this acceptable or a violation?
Violation
The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not to exceed the lowest temperature rating of any connected ?.
conductor device termination
The ambient temperature correction factor table shows that as the ambient air temperature increases, the ampacity of the conductor will 2.
decrease
Armored Cable, Type AC, is permitted to be installed in ?.
dry locations
In general, service-entrance cable installed to supply branch-circuits shall be permitted for use where the insulated conductors are used for the circuit wiring and the uninsulated conductor is used only for ? purposes.
equipment grounding
In general, a fitting to protect wires from abrasion and a(n) ? or its equivalent protection shall be provided between the conductors and the armor at all points where the armor of Type AC cable terminates.
insulating bushing
