Conduit lvl 1 lesson 7

What is the shrink constant for an angle of 5°? Select one: a. 1/16" b. 1/8" c. 3/16" d. 1/4"

1/16

What is the shrink constant for an angle of 15°? Select one: a. 1/16" b. 1/8" c. 3/16" d. 1/4"

1/8

A typical installation is shown with three kicks having been made using 22 1/2° bends. Keep in mind that when making kicks using the multiplier method the technique is very similar to making offsets; however, the bending reference mark for a kick is the center of the bend, not the arrow benchmark.In order to determine the amount of kick needed, a measurement must be taken. In this case, that measurement is made from the wall upon which the three horizontal conduits are mounted, to the back of the kicks, as shown in the photo top right. Presume that the value for the kicks will be 4 5/8 inches for Conduits A and B, and 3 1/4 inches for Conduit C. The stub length for Conduit A is 18 1/4 inches, and 16 1/8 inches for Conduit B. Both of these stubs will be kicked out away from the wall by 4 5/8 inches. The stub length for Conduit C is 32 inches, and it will be kicked out by 3 1/4 inches.Use the multiplier method to calculate the distance from the back of the 90 to the center of the bend for Conduits A and B. (Round the FINAL answer to the nearest whole number.) Click on the image to view a larger version of it. Answer:inches Feedback Distance = Multiplier × Rise= 2.6 × 4 5/8"= 12.025"≈ "

12

Based upon the position of Mark 1 and Mark 2 for Conduit A, and the adjustment value calculated, calculate the position of Mark 2 for Conduit C. Click on the image to view a larger version of it. Select one: a. 12" Incorrect b. 15 1/4" Correct c. 17 1/16" Incorrect d. 18" Incorrect Mark 2 = 22 − 6 3/4"= "

15 1/4

Based upon the position of Mark 1 and Mark 2 for Conduit A, and the adjustment value calculated, calculate the position of Mark 2 for Conduit B. Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 13 5/8" b. 15 7/8" c. 21/16" d. 24 3/4" Mark 2 = 22 5/8" − 6 3/4"= "

15 7/8

Since Conduit A is nearest to the obstruction, it will be used as the reference conduit and its layout done first. Calculate the distance from the end of the conduit to Mark 2 for Conduit A. Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 13 1/8" b. 16" c. 16 1/2" d. 19 1/8" Distance between Bends = Multiplier × Offset Rise= 2 × 3 3/8"= 6 3/4"Mark 2 = Mark 1 − Distance between Bends= 23 1/4" − 6 3/4"= "

16 1/2

Next, the distance between the conduits must be measured as shown. Determine the center-to-center spacing in order to calculate the amount of adjustment that will have to be applied to Conduits B and C so that the three conduits are equally spaced throughout the offset.What is the "between-centers" distance that will be used in determining the adjustment to the bend layout? Note: The values for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 1" b. 2" c. 2 7/16" d. 3"

2 7/16

Two junction boxes are to be connected by a piece of 3/4-inch conduit. The distance between the boxes is 47 1/2 inches, and the conduit will have to be offset by 8 1/4 inches.If the conduit will be cut prior to bending, and the bends will be 22 1/2°, what will be the distance between the bending marks for the offset? (Hint: Use 2.6 as the distance multiplier.) Select one: a. 18 5/8" b. 19 1/2" c. 21 7/16" d. 22 1/4" Distance = Multiplier × Offset Rise= 8 1/4 × 2.6"= 8.25 × 2.6"= 21.45"≈ "

21 7/16

Based upon the position of Mark 1 and Mark 2 for Conduit A, and the adjustment value calculated, calculate the position of Mark 1 for Conduit C. Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 22" b. 22 7/8" c. 23 1/16" d. 24 1/4" Mark 1 = Conduit B, Mark 1 − Adjustment= 22 5/8"− 5/8"= "

22

A 45° offset has been formed in a 3/4-inch EMT conduit. The distance to the obstruction is 28 5/8 inches and the height of the obstruction is 6 1/4 inches.Calculate the distance from the end of the conduit on the left to Mark 2. Click on the image to view a larger version of it. Select one: a. 18 3/8" b. 19 1/2" c. 22 3/16" d. 22 3/4" Distance between Bends = Multiplier × Offset Rise= 1.41 × 6 1/4"= 8.8125"= 8 13/16"Mark 2 =Mark 2 = Mark 1 − Distance between Bends= 31 − 8 13/16"

22 3/16

What is the distance to the edge of the junction box? Note: The values for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 22 3/8" b. 23" c. 24" d. 25 1/2"

22 3/8

Based upon the position of Mark 1 and Mark 2 for Conduit A, and the adjustment value calculated, calculate the position of Mark 1 for Conduit B. Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 21 3/8" b. 22 5/8" c. 23/16" d. 24 1/4" Mark 1 = Conduit A, Mark 1 − Adjustment= 23 1/4" − 5/8"= "

22 5/8

22 1/2° offset has been formed in a 3/4-inch EMT conduit. The distance to the obstruction is 37 5/8 inches, and the offset rise is 6 1/4 inches.Calculate the distance from the end of the conduit to Mark 2. Click on the image to view a larger version of it. Select one: a. 22 9/16" b. 24 13/16" c. 26 3/16" d. 28 3/4" Distance between Bends = Multiplier × Offset Rise= 2.6 × 6 1/4"= 16.25"= 16 1/4"Mark 2 = Mark 1 − Distance between Bends= 38 13/16" − 16 1/4"= " The correct answer is: "

22 9/16

Since Conduit A is nearest to the obstruction, it will be used as the reference conduit and its layout done first. Calculate the distance from the end of the conduit to Mark 1 for Conduit A. Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 23 1/4" b. 24" c. 24 3/4" d. 25 1/2" Shrink = Constant × Offset Rise= 1/4" × 3 3/8"= 0.84375"= 7/8"Mark 1 = Distance to Obstruction + Shrink= 22 3/8"+ 7/8"= " The correct answer is: "

23 1/4

Which of the following is not a standard angle used for offsets

25

Three 1/2-inch EMT conduits start at the box on the top left and must clear the junction box on the top right. Notice that the lowest offset, the one in Conduit A, has been pre-positioned to make the end of the bend align with the left side of the 4 11/16-inch box. The bend angle will be 30°. In order to determine the amount of offset rise needed, a level is extended from the top of the 4 11/16-inch box to the box on the left, and then a measurement is taken from the bottom of the level to the lowest connector.How much offset rise is needed to allow the bottom conduit to go over the top of the 4 11/16-inch box? Note: The values for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 7/8" b. 2 1/4" c. 3" d. 3 3/8"

3 3/8

What is the most common angle used when making offsets

30

A 45° offset has been formed in a 3/4-inch EMT conduit. The distance to the obstruction is 28 5/8 inches and the height of the obstruction is 6 1/4 inches.Calculate the distance from the end of the conduit on the left to Mark 1. Note: The values calculated for this question will be used in additional questions. Hint: Use the fraction provided in the shrink constant table for your calculations. Select the closest answer. Click on the image to view a larger version of it.

31

A 22 1/2° offset has been formed in a 3/4-inch EMT conduit. The distance to the obstruction is 37 5/8 inches, and the offset rise is 6 1/4 inches.Calculate the distance from the end of the conduit to Mark 1. Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 36 3/8" b. 38 13/16" c. 39 3/16" d. 41 3/4" hrink = Constant × Offset Rise= 3/16" × 6 1/4"= 1.1719"≈ 1 3/16"Mark 1 =Mark 1 = Distance to Obstruction + Shrink= 37 5/8" + 1 3/16"= 38.8125"= "

38 13/16

Perform the necessary calculations to pre-position the bends for the 30° offset in the photo. Calculate the position of Mark 2. Click on the image to view a larger version of it. Select one: a. 38" b. 38 7/8" c. 39 3/16" d. 41 1/2" Distance between Bends = Multiplier × Offset Rise= 2 × 4"= 8"Mark 2 = Mark 1 − Distance between Bends= 46 7/8" − 8"= " The correct answer is: "

38 7/8

Perform the necessary calculations to pre-position the bends for the 30° offset in the photo. Calculate the position of Mark 1. (Distance to obstruction = 45 7/8".) Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 42 3/16" b. 46 7/8" c. 50 3/16" d. 51 1/2" Shrink = Constant × Offset Rise= 1/4 " × 4"= 1"Mark 1 = Distance to Obstruction + Shrink= 45 7/8" + 1"

46 7/8

Conduit A has a stub-up length of 18 1/4 inches, a leg length of 33 1/8 inches, and a22 1/2° kick of 4 5/8 inches. If the bender used has a gain of 3 1/2 inches, how long will the conduit have to be if it is to be cut prior to bending? Click on the image to view a larger version of it. Select one: a. 47" b. 47 7/8" c. 48 1/16" d. 48 3/4" Feedback Your answer is incorrect. Shrink = Constant × Rise= 3/16" × 4 5/8"= 0.867"≈ 7/8"Total Length = Stub-up + Leg + Shrink − Gain= 18 1/4" + 33 1/8" + 7/8" − 3 1/2"= 52.25 − 3 1/2"= "

48 3/4

Two junction boxes are to be connected by a piece of 3/4-inch conduit. The distance between the boxes is 47 1/2 inches, and the conduit will have to be offset by 8 1/4 inches.If the conduit will be cut prior to bending, and the bends will be 22 1/2°, the length of the conduit will be ? . Select one: a. 37 5/8" b. 41 1/2" c. 45 7/16" d. 49 1/16" Shrink = Shrink Constant × Offset Rise= 3/16" × 8 1/4"= 1 9/16"or Shrink = 0.19 × 8.25= 1.5675≈ 1 9/16"Total Length =Total Length = Run Length + Shrink= 47 1/2" + 1 9/16"

49 1/2

Perform the necessary calculations to pre-position the bends for the 15° offset shown in the photo. Calculate the position of Mark 2. Click on the image to view a larger version of it. Select one: a. 49 7/16" b. 58 7/8" c. 59 3/16" d. 64 7/8" Mark 2 = Mark 1 − Distance between Bends= 64 7/8" − 15 7/16"= "

49 7/16

Calculate the amount of adjustment that will have to be applied to Conduit B and Conduit C in order to keep the spacing between the offsets equidistant throughout the bends. Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 3/8" b. 5/8" c. 13/16" d. 1" Adjustment = Constant × Distance between Centerlines= 1/4" × 2 7/16"= 0.25" × 2.4375"= 0.609"≈ "

5/8

Perform the necessary calculations to pre-position the bends for the 15° offset shown in the photo. Calculate the position of Mark 1. (Distance to obstruction = 64 3/8".) Note: The values calculated for this question will be used in additional questions. Click on the image to view a larger version of it. Select one: a. 58" b. 58 7/8" c. 59 3/16" d. 64 7/8" Mark 1 = Distance to Obstruction + Shrink= 64 3/8" + 1/2"= "

64 7/8

Calculate the distance from the back of the 90 to the center of the bend for Conduit C. Click on the image to view a larger version of it. Select one: a. 7" b. 7 7/8" c. 8 1/16" d. 8 7/16" Feedback Your answer is correct. Distance = Multiplier × Rise= 2.6 × 3 1/4"= 8.45"≈ "

8 7/16

When making an offset, the bender must face in opposite directions for both bends. Select one: True False

False

An offset can be used for which of the following purposes? I. To avoid the use of fittings II. To change the direction of the conduit III. To change the elevation of the conduit IV. To enter a knockout in a box or enclosure V. To go around an obstruction Select one: a. I., II., and III. b. II., III., and IV. c. III., IV., and V. d. IV. and V. only

III, IV, V

Why should sharp angles of bend be avoided when making offsets

Sharp angles should be avoided becasue they will make it more difficult to pull the conductors

The total reduction in the length of a run that results from making an offset is called the ______

Shrink

The most common method for making an offset is the multiplier method. T or F

T

Which of the following identifies proper offset measurements

Top to Top, or Bottom to Bottom

The measured rise method for bending an offset should be used when the angle of the bend cannot be predicted or measured accurately. Select one: True False

True

To calculate the overall length of conduit needed to fabricate an offset, it is necessary to calculate the shrink and ? the amount to the length of the run. Select one: a. add b. divide c. multiply d. subtract

add

What tools can be used to check the accuracy of the angle marks on a bender? Select one: a. A plumb bob b. A protractor level c. A spirit (torpedo) level d. a. and b. e. b. and c.

b and c

The inside edges of the bend are extended by using a straightedge and marking with a pencil. The point at which the lines intersect is where the ? is located. Select one: a. center of the bend b. first bend of an offset c. rise of the bend d. second bend of an offset

center of the bend

The distance between offset bends is determined by multiplying the amount of offset needed by the ________ of the angle

cosecant

What is the term for an offset that has been made without its two bends being made with the conduit rotated exactly 180°? Select one: a. Dogleg b. Kick c. Springback d. Wew

dogleg

Which of the following factors should be considered when fabricating an Offset? i. The amount of offset needed ii. The amount of space available iii. the angle of bend to be used. iv. the total degrees of bend in the conduit run v. the difficulty of pulling wire through increased angles of bend.

i ii iii iv v

Whether a measurement is taken vertically or horizontally the amount of offset needed is called the ? . Select one: a. calculation b. drop c. rise d. span

rise

Shrink is determined by multiplying the ? by the offset rise. Select one: a. cosecant b. diameter of the conduit c. offset multiplier d. shrink constant

shrink constant

Which benchmark on the bender is typically used when making offsets? Select one: a. The angle markings b. The arrow c. The rim notch d. The star

the arrow