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4.3.1.
Mounting of IDP
IDP is installed in power room near to the switching cubicle at a distance of
about 5 mtrs from it. The size of IDP is 700x700x1700mm. It is to be mounted
by fixing the bottom frame assembly on the floor with four rawl bolts.
4.3.2.
IDP Cabling
The interconnection from switching cubicle to IDP is either through bus bars
or maximum three pairs of PVC insulated cable of conductor cross section 240
sq. mm. crimped with a copper lugs on both the ends.
For extending the power from IDP to DCDP in the Switch Room, PVC
insulated cables of size 240 sq. mm is used. There is a provision for a
maximum of six pairs of cables, each pair used for -48V and -48V GND.
All these cables are explained in Chapter 10 and are connected as shown in
Fig. 10.7 (a).
4.4.
DC DISTRIBUTION PANELS [DCDP'S]
Two number of DC Distribution Panels (refer Fig. 4.2) are used for distribution of -
48V to the suites (for more than 3 suites ), IOP-PDP, invertors, and an emergency
light through a MCB (Miniature Circuit Breaker ) protection mechanism. ONE
DCDP is sufficient for 3 number of full suites and IOP-PDP, inverters emergency
light etc.) Both are mounted on the floor. It has two slots on the top, one for entry of
the input cables from IDP [3 pair in copy-0 and 3 pair in copy-1], and the other for
the exit of cables. It has a front cover which can be opened by unlocking the two
locks provided on it. Inside the DCDP, there are two busbars coupled with each
other by another copper busbar. MCBs are mounted on these busbars for connecting
cables which extend the supply to suites - 120 amps, IOP-PDP - 30 Amps, Inverter -
30 Amps and Emergency light - 30 Amps. First busbar is used for supplying -48V
for copy 0 of the suites and second busbar is used for supplying -48V to copy 1 of the
suites. Below the -48V busbars is the -48V gnd busbar. It has provisions to
terminate cables both on the front as well as rear. -48V gnd cables for copy0 of the
suites can be terminated at the front side and copy1 cables can be terminated on the
rear. Below the -48V gnd busbar is a Digital gnd busbar and Chassis gnd busbar.
Each DCDP has a provision to house an FBI (Fuse Blown Indication) card to sense
the tripping of MCBs. The -48V busbar has a provision for DC supply to FBI card.
The FBI card has LEDs on it for indicating tripping of any MCB. They may be seen
through an acrylic sheet on the front of DCDP.
INSTALLATION MANUAL
IDP & DC DISTRIBUTION PANEL
49
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