Laying of cables
Laying of cables
1- Race way:
·
this method will be used in important place like labs, hospitals and in
some applications it will be wall mounted.
2-cable trays:
·
this method is used in industrial loads.
3-under ground:
·
there are different method for laying depend on the type of cable and
the importance of the cable.
·
Cable supported on brackets above ground level.
·
Cables laid directly in ground ( direct burial ).
The depth of trench may be
vary between 0.8 m to 1.5 m depends on voltage level.
4 - cables laid in ducts:
· this method for vital cable and
for crossing ways.
· Two man holed to repair the cable
easy when fault happen.
5- Conduits ( pipes ) for
buildings ( walls & ceiling )
Note:
· It is prohibited to lay conduits
in finished floors
· When we use any pipe we must have
space factor = 0.45 space factor
= ∑ area of cables /
internal area of conduit this space factor for:
·
Ventilation
·
Expansions & extensions.
6- troughs: this method is very high is very high expensive and
used in labs.
