Manholes and Handholes Flashcards
vaults usually house bulky items such as large transformers and network protective devices
true
manholes serve as cable junction points for pulling in new or replacement cable or to splice existing cables.
true
Manholes are usually located at street intersections, and the distance between them seldom exceeds 500 feet.
true
What are manholes made of?
Precast-concrete
The walls of precast-concrete vary in thickness from ? to ?.
8” to 2’
Manholes are constructed in such a manner as to keep them as dry as possible.
True
If manholes are incorporated into a system, the bottom of the excavation area should be firm and undisturbed or compacted earth.
true
Conduit runs should terminate flush on the interior side of the manhole wall.
true
If pulling eyes are installed in a manhole, they should be installed in the wall directly opposite the conduit run. Properly positioned pulling eyes help facilitate the pulling in of cable.
true
Manholes are most used in a dense city environment because they ? .
give access to cables already in place
To keep manholes free from water, ? are examples of active type systems.
automatic pumps
The most common use for a manhole is to ? .
splice cables
Manholes are usually located ? .
at street intersections
A “three way” manhole is one where ? .
ducts enter and leave in three different directions
Manhole covers have changed very little in the last century. They are made of steel with a minimum diameter of ? to allow for worker access.
32”
A subsurface enclosure used on lateral two-way duct lines and are restricted to one-conductor cables, best describes a ? .
handhole
Prior to the 1960s, manholes were primarily constructed of poured on site reinforced concrete or ? .
brick and mortar
The size and shape of a manhole is usually determined by the ? .
number of ducts entering and leaving
Manholes are always constructed on the site where they will be used.
False
A vault or manhole kept dry by a drain connected to a sewer, typically will have a ? to prevent gas from entering.
Trap
The type of surrounding soil affects the construction of a manhole.
True
The backfill material around a manhole should be ? or the excavated material from the hole if it is fine and dry.
sand
Conduit runs should terminate ? on the inside of the manhole wall.
flush
If pulling eyes are installed in a manhole, they should be installed in the opposite wall ? the conduit termination.
directly across from
