Bus tie duct also known by the term BTD is a system of
distributing electric power using copper busbars with
suitable enclosures preferably metal structure to prevent
the busducts from getting damaged from foreign bodies.
Busbars are now becoming irreplaceable simply because of the
convenience and safety factor. While using traditional
cables, the cost of cabling and trunking and the time taken
for installation is much higher than busbars. Comparision
between using BTD and Cables.
Comparision between using BTD and Cables.
BTD
CABLES
feature
Finishing is superior, hence adds to aesthetics of
building.
Power feeding to Multiple floor building can be done
with single Bus-trunking system.
Power tap-off can be achieved from the single system
in- stalled. In case the load changes, one may simply
replace the Tap off boxes to higher ratings.
feature
Improper laying of the cables may spoil the aesthetics
of building.
Power tap off can be done from the single system
installed. In case the load changes we have to just
replace the Tap off boxes of higher rating.
Not possible. Additional cables need to be laid up to
the particular floor.
voltage drop
The voltage drop of bus trunking is less as compared
to cables.
voltage drop
The voltage drop is more in cables
structure
Example for 3200A(Cu) dimensions: 151(w)x340(h) and
light in weight.
Total run is made up of multiple elements which are
joined together. Thus, making the complete system
maintenance friendly.
Easy retrofitting of the elements is possible in case
the location and the consumer load changes.
Totally enclosed, tamper-proof. Fit and forget system.
structure
Cables and supporting structure example for 700mm wide
i.e., cable tray etc. is very heavy and occupies more
space.
As single lengths of multiple cables are installed,
making them maintenance non-friendly.
Easy retrofitting of the element is not possible in
case the location and consumer load.
Insulation can wear off with time. Can get damaged by
rodents. Has to be maintained on regular basis.
Degree of Protection
IP54 for plug-in type, IP55/65 for feeder type.
Degree of Protection
No protection as such.
enclosure
Cables are simply insulated with multiple layers of
PVC.
Low Short circuit strength & low fire protection.
enclosure
It consists of busbars in a protective enclosure,
including straight lengths, fittings, devices and
accessories.
High Short circuit strength & high fire protection.
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