Select the best answer:

1. If four 12-2 Type NM cables measuring 0.48 in. by 0.20 in. in cross section are run in a raceway along a wall 70 ft between. two pull boxes, what size raceway must be installed? The cross-sectional area of the cable is 0.075 [in.sup.2].

a. 1-in.

b. 1 1/4-in.

c. 1 1/2-in.

d. 2-in.

2. Now suppose the same basic installation as in the first question is wired with similar cable that is the same thickness but only 0.46 in. wide, reducing the cross-sectional area to 0.072 [in.sup.2]. If five cables will be installed, now how large would the race-way need to be?

a. 1-in.

b. 1 1/4-in.

c. 1 1/2-in.

d. 2-in.

3. Suppose the five 12-2 Type NM cables in the second question are to be installed in Schedule 80 PVC rigid nonmetallic conduit. Now how large would the raceway need to be?

a. 1-in.

b. 1 1/4-in.

c. 1 1/2-in.

d. 2-in.

4. If PVC conduit will be exposed to direct sunlight outdoors, the manufacturer recommends using 140 [degrees] F for the maximum design temperature. Assuming you are working on a 40 [degrees] F day in an area that can reach -30 [degrees] F in the winter, how much room must be left in the piston cavities of the expansion fittings? There will be four fittings, each with a 4-in. maximum throw in a 200-ft total run. Assume the expansion fittings are evenly spaced over the run, and the conduit is free to move.

a. 1.4 in. to a maximum of 2.05 in.

b. 2.05 in. to a maximum of 2.6 in.

c. at least 3.45 in.

d. fittings not required

5. What is the combined ampacity of a parallel make-up, for a 3-phase ungrounded power load, of three sets of 600kcmil THHN single conductors in a cable tray installed under appropriate engineering supervision? The air temperature is expected to reach 120 [degrees] F.

a. 1169A

b. 1439A

c. 1727A

d. 1919A

6. What is the combined ampacity of a parallel make-up of three sets of 600kcmil THWN conductors installed under appropriate engineering supervision in three parallel ducts buried in the earth? Figure the true ampacity that could be used for actual loading, and not as would be used with Art. 220 load calculations. Assume generally applicable earth temperature and heat-transfer conditions.

a. 1113A

b. 1260A

c. 1404A

d. 1425A