S.N. Pre - Fabricated Trays Fabricated Trays
1 The fabrication quality of these cable trays
are superior and looks aesthetically good af-
ter installationThe fabrication quality entirely
depends upon site people fabricating
the task but normally observed
average which looks aesthetically
not so good after installation.
2 The cable trays are available in modular
concept hence installation is quite simpler.The cable trays are manually
fabricated at site with an endless con-
cept. Joining the cable trays is big task
for erectors.
3 The cable trays are fully hot dip galvanized
after completion of fabrication work. The
trays do not get rusted due to proper galva-
nizing coating over entire portion of it.The cable trays fully fabricated by lo-
cal man power and painted with red ox-
ide. There are chances of unpainted part
on the cable tray.
4 Cable laying in these cable trays are safer
from electro mechanical damages due to
proper height of runner.Cable laying in these cable trays are
not safer from electro mechanical
damages due to improper height of run-
ner.
5 Pre-procurement planning of these cable
trays is essential requirement because of
bought out item otherwise there are chanc-
es of surplus or shortfall of material.For these trays, no pre-planning
is required because of site fabrication
activities. The material can be pro-
duces as per requirement by the skilled
workmen available for erection ac-
tivities.
6 The overall quality of pre-fabricated cable
trays are superior in terms of fabrication,
welding, galvanizing, erection etc.The overall quality of fabricated cable
trays are not comparable with GI cable
trays in terms of fabrication, welding, gal-
vanizing, erection etc.
7The cable trays are cheaper than fabricated ca-
ble trays due to use of 2.15mm sheet metalsThe cable trays are costlier than pre-fab-
ricated trays due to use of angles and
flat.
8 Bending stress of these cable trays is much
better than fabricated cable trays due to
proper design of runner height.Bending stress of these cable trays is
much lesser than pre-fabricated cable
trays due to proper design of runner
height.
9 The pre-fabricated cable tray does not needs
welding machines, raw material, welding
rods, electrical power, cutting machines,
fabrication yard etc. Hence, people are
comfortable, confident, have concentration
on erection work only.The site fabricated cable tray needs
welding machines, raw material,
welding rods, electrical power, cutting
machines, fabrication yard etc. All
these requirement leads to unnecessary
stress to contractor as well as project ex-
ecutives.
10 The pre-fabricated cable tray does not need
skilled fitters, welders and helpers for fabri-
cation work. This activity avoids nuisance
pressure to contractor and proj-
ect executives even in critical phase of the
project.Site fabricated cable tray needs
skilled fitters, welders and helpers for
fabrication work. This activity creates
nuisance pressure to contractor and
project executives in critical phase of the
project.5.3 Technical Comparison: