job info 2 lesson 2

Match the following inches to their correct conversion in mils. I. 125 mil II. 250 mils III. 750 mils IV. 1,333 mils V. 4,000 mils VI. 80,000 mils

0.25 inches = mils 0.125 inches = mils 1/4 inch = mils 3/4 inch =. mils . a. 0.25 × 1,000 = 250 mils b. 0.125 × 1,000 = 125 mils c. convert 1/4 to 0.25 0.25 × 1,000 = 250 mils d. convert 3/4 to 0.75 0.75 × 1,000 = 750 mils

What is the resistance of 3,302 feet of 8 AWG copper wire that has a circular mil area of 16,510?

1,651 feet per ohm 3,302/1,651= 2 Ω

A person has a piece of wire that is 12 strands of 118.3 mils diameter. What is the approximate size of wire? This is the second step in a three step process. You will need this answer for the next question. Second Step: Multiply circular mil area by number of strands.

13,995 × 12 = 167,940 cmil

In general the smallest size building wire used in construction power and light circuits under 600 v is __ Awg copper or __ awg aluminum or copper clad aluminum.

14/12 nec 310.106

The largest size wire listed in wire gauge number is ? .

4/0

How many strands of 10 AWG wire would it take to make a 500-kcmil cable?

49

Match the following mils to their correct conversion in inches. I. 1/8" II. 3/16" III. 1/4" IV. 5/16" V. 3/8" VI. 1/2" VII. 3/4"

500 mils = inches 375 mils = inches 750 mils = inches 187.5 mils = inches . a. 500/1,000 = 0.5" or 1/2" b. 375/1,000 = 0.375" or 3/8" c. 750/1,000 = 0.75" or 3/4" d. 187.5/1,000 = 0.1875" or 3/16"

In general, all conductors __ awg and larger, installed in a raceway shall be stranded

8 nec 310.106 c

The allowable ampacities in Table 310.15(B)(16) and Table 310.15(B)(17) are based on an ambient temperature of ? °F.

86°F

Which formula is used to find circular mil area?

A = Dm2

A person has a piece of wire that is 12 strands of 118.3 mils diameter. What is the approximate size of wire? This is the third and final step in a three step process. Third Step: Use Chapter 9, Table 8 of the Code to locate size closest wire size. The AWG for a wire made up of 12 strands that is 118.3 mils diameter is ? .

Awg 3/0

The ? of a conductor is defined as the diameter of the conductor in mils, squared.

Circular mil area

What is the circular mil area of wires having the following diameters? I. 10.404 II. 100 III. 250 IV. 1,000 V. 10,404 VI. 25,000 VII. 250,000

I. 10.404 II. 100 III. 250 IV. 1,000 V. 10,404 VI. 25,000 VII. 250,000 500 mils = circular mil area 10 mils = circular mil area 0.1020 inch = circular mil area . a. 500 × 500 = 250,000 cm or 250 kcmil b. 10 × 10 = 100 cm c. 102 × 102 = 10,404 cm or 10.404 kcmil

Indicate the allowable current-carrying capacity for each of the following conductors. I. 100 II. 120 III. 150 IV. 180 V. 230 VI. 250

I. 100 II. 120 III. 150 IV. 180 V. 230 VI. 250 Amperes for 3 1/0 AWG, THW, copper in conduit. 3 Amperes for a single 1/0 AWG, THW, copper conductor in free air. 5 Amperes for 3 1/0 AWG, THW, aluminum in conductor in conduit. 2 Amperes for a single 1/0 AWG, THW, aluminum conductor in free air. 4

To find the resistance of a given conductor, drop the ? digit from the circular mil area. The result is the number of ? per ohm.

Last/ feet

Match the circular mil area of the following wire sizes. I. 4,110 cm II. 6,530 cm III. 10,380 cm IV. 16,510 cm V. 26,240 cm VI. 41,740 cm 10 AWG circular mil area Choose...IV.VI.I.III.V.II. Correct 8 AWG circular mil area Choose...IV.VI.I.III.V.II. Correct 6 AWG circular mil area Choose...IV.VI.I.III.V.II. Correct 14 AWG circular mil area Choose...IV.VI.I.III.V.II. Correct 4 AWG circular mil area Choose...IV.VI.I.III.V.II. Correct 12 AWG circular mil area

Match the circular mil area of the following wire sizes. I. 4,110 cm II. 6,530 cm III. 10,380 cm IV. 16,510 cm V. 26,240 cm VI. 41,740 cm 10 AWG circular mil area 3 8 AWG circular mil area 4 6 AWG circular mil area 5 14 AWG circular mil area 1 4 AWG circular mil area 6 12 AWG circular mil area. 2

To find the area of a wire in circular mils, square the diameter expressed in ? .

Mils

Which formula determines the resistance of a conductor?

Rohms = K × Lfeet / ACM

What is the resistance of 1,000 feet of No. 14 copper wire? Use given properties. Given: copper = 10.4 ohms per circular mil foot No. 14 wire circular mil area = 4,110 cmil

Rohms = K × Lfeet / ACM = 10.4 × 1,000/4,110 = 2.53 Ω

What might happen to thermoplastic insulation at temperatures colder than -10°C (+14°F)?

The insulation might stiffen

In reference to wire size, AWG stands for American Wire Gauge.

True

What length of 12 AWG copper wire would be required to produce a resistance of five ohms? (Use the approximation method.)

cm area is 6,530 cm 653 feet per ohm 5 × 653 = 3,265 feet

A person has a piece of wire that is 12 strands of 118.3 mils diameter. To determine the size of wire will require three steps. The first step is to calculate the circular mil area for each strand. (Round the final answer to a whole number.)

cmil 118.3 × 118.3 = 13,995

There are no color coding requirements for grounded conductors found in the NEC.

false nec 200.6

Write out in words what 250 kcmil means.

two hundred and fifty thousand circular mils