installing cable in an underground vault/manhole

Question 1

When pulling in cable using a wire-mesh grip with a swivel eye, the pulling tension is usually less than ?

Answer 1

1,000 lbs

Question 2

One way a duct can be checked for proper diameter and obstructions is to ? through the conduit.

Answer 2

pull a flexible steel mandrel

Question 3

If a cable is required to make a smooth low-friction 90° turn in a vault, a ? or lip-roller block would be used.

Answer 3

quadrant

Question 4

Depending on the jurisdiction, underground utility vaults (manholes) more than ? deep are considered to be an enclosed space.

Answer 4

4’

Question 5

When a blower is used to provide fresh air in an enclosed space such as a manhole, a blower with a capacity of ? cfm or greater is used.

Answer 5

1,000

Question 6

Historically, about 60% of fatalities involving confined spaces occur when ?

Answer 6

attendants perform a rescue

Question 7

When ventilating a vault (manhole) with a blower, the space should be ventilated for at least ? before entering.

Answer 7

5 min

Question 8

When terminating cable in a vault, the bending radius should be at least ? times the cable diameter to prevent damage to the cable.

Answer 8

12

Question 9

Drop-in anchors for securing cable racks should have a rated pullout working capacity of at least ? lbs.

Answer 9

2,100 lbs

Question 10

When metallic racks support cables in vaults, the cables are held in support insulators made from ?

Answer 10

high grade porcelain