Chapter 13 Pathways

Question 1

WHAT IS SOFT DIGGING?

Answer 1

The process of locating
underground facilities through
the use of nondestructive
vacuum excavation
TDMM: Page 13-30

Question 2

Name 3 methods for
locating underground
facilities.

Answer 2

1 .Electronic
2.Water vacuum
3.Air vacuum
TDMM: Page 13-31

Question 3

What is the purpose of
warning tape?

Answer 3

Helps to prevent
accidental dig-up
TDMM: Page 13-31

Question 4

What type of warning tape
should be used with optical
fiber cabling?

Answer 4

Detectable warning tape
TDMM: Page 13-31

Question 5

What is the
recommendation regarding
the depth of a trench?

Answer 5

The minimum depth should
allow for =610 mm (24 in) of
cover from the top of the cable
to final grade.
TDMM: Page 13-32

Question 6

What is the minimum
separation that must be
maintained between a gas
pipe and telecom cables
when they cross in a trench?

Answer 6

:152 mm (6 in)
TDMM:Page 13-32, Table 13.3

Question 7

What is the minimum
separation that must be
maintained between a street
railway and telecom cabling
in a trench?

Answer 7

1 m (3.28 ft) below top of rail
TDMM:Page 13-32, Table 13.3

Question 8

Why is a backhoe
considered to be the most
appropriate way to dig
large trenches for multiple
ducts or cables?

Answer 8

Because it requires the work
area to be fenced in after
working hours, which addresses
the safety of the nearby
community
TDMM: Page 13-33

Question 9

Name 4 disadvantages
associated with using a
backhoe to dig trenches.

Answer 9

I .Frequent repositionina to
accommodate the backhoe’s
reach
2.Substantial space required
beside the trench to temporarily
hold excavated dirt
3.Extensive surface restoration
requirements after installations
are complete
4.Restriction to open areas
TDMM: Page 13-33

Question 10

Name 3 alternatives to the
traditional backhoe method
for placing underground
and direct-buried facilities.

Answer 10

1 .Compact trencher
2.Vibratory plow
3.HorizontaI directional drilling
TDMM: Page 13-34

Question 11

Why are different types of
transmission media
separated when they are
installed in the same
underground pathway?

Answer 11

Because separation provides:
*Ready identification
*Individual mechanical protection
*Individual growth potential
TDMM: Page 13-37

Question 12

How can you protect
conduit that passes under
roads, driveways, or
railroad tracks?

Answer 12

Encase the conduit in concrete.
TDMM: Page 13-41

Question 13

What should be done to
prevent conduits from
shearing?

Answer 13

Extend sleeves through the walls
into the undisturbed earth.
TDMM: Page 13-41

Question 14

Name 4 types of
corrosion-resistant conduit.

Answer 14

I .Fiber or fiberglass
2. Concrete
3.Rigid galvanized metal
4. Rigid and non-rigid non-metallic
TDMM: Page 13-42

Question 15

How is most conduit listed?

Answer 15

BY TRADE SIZE

Question 16

How many covers are
required for an MH that
measures between
=3.7 m (12 ft) and
-6.1 m (20 ft) long?

Answer 16

2
TDMM: Page 13-48

Question 17

How many covers are
required for an MH that is
longer =6.1 m (20 ft)?

Answer 17

3
TDMM: Page 13-48

Question 18

What marking is typically
used for the cover of a
telephone manhole?

Answer 18

T for telecommunications
TDMM: Page 13-48

Question 19

What does an S marking on
an MH cover typically
represent?

Answer 19

Signal
TDMM: Page 13-48

Question 20

What does a C marking on
an MH cover typically
represent?

Answer 20

Communication
TDMM: Page 13-48

Question 21

Where should the number
for an MH be placed?

Answer 21

On the inside collar of the MH
above the first step
TDMM: Page 13-48

Question 22

Name 3 benefits of placing
main conduit entry points
at opposite ends of an MH.

Answer 22

I .AIIows for an organized cable
formation
2.Maximizes the available
working space at the center of
the MH
3.Permits splaying the entry
points in certain installations
TDMM: Page 13-51

Question 23

What is the strength
requirements for concrete
used for cast-in-place
MHs?

Answer 23

24,132 kPA (3500 psi)
TDMM: Page 13-51

Question 24

Why should precast MHS
be used whenever
possible?

Answer 24

For uniformity, economy, and
installation efficiency
TDMM: Page 13-51

Question 25

Name 2 instances when site-cast MHS should be used.

Answer 25

1 . The size required for the MH exceeds the precast sizes. 2.0bstructions prohibit the use of precast MHs. TDMM: Page 13-51

Question 26

Name 4 factors that should be considered when selecting the permanent location for pole lines.

Answer 26

I .Future road widening or realignment 2.Expansion of other utilities 3.SpeciaI problems 4.Safety and convenience of workers and the general public TDMM: Page 13-52

Question 27

Name 3 considerations for pole design.

Answer 27

1 .Pole-line classification 2.Storm loading 3.Clearance requirements TDMM: Page 13-52

Question 28

When should self- supporting cable be used instead of lashed?

Answer 28

*It is available in the required size. *There is no existing strand. *New cable cannot be lashed to an existing cable. *Adequate space exists for future growth. TDMM: Page 13-52

Question 29

What is basis of pole class designations?

Answer 29

Design load not exceeding a percentage of the breaking strength TDMM: Page 13-53

Question 30

What type of loading refers to wind pressure on the attachments and aboveground portion of the pole?

Answer 30

Transverse storm loading TDMM: Page 13-53

Question 31

What is vertical loading?

Answer 31

The weight of the attachments and, on guyed poles, the vertical component of the tensions in the guys TDMM: Page 13-53

Question 32

What can create a bending moment on an aerial pole?

Answer 32

Eccentric loads or unbalanced tensions at unguyed corners and dead ends TDMM: Page 13-53

Question 33

True or False The ICT designer is liable for reporting any existing hazard that must be corrected to the responsible utility company or owner.

Answer 33

True. The ICT designer is liable for reporting any existing hazard that must be corrected to the responsible utility company or owner. TDMM: Page 13-53