manholes and handholes Flashcards
the distance between manholes seldom exceeds
500’
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
Pre-cast concrete manholes are manufactured with walls varying in thickness from a minimum of ? to a maximum of ? , depending on the location where they will be used.
8” / 24”
It is recommended to place equipment directly below the manhole access opening to allow for ease in maintenance and testing.
false
Vaults that have openings into enclosed areas used by the public must have ? provided
adequate ventilation
The type of surrounding soil affects the construction of a manhole.
true
