purchase & stores division - ISRO

Wiring shall be terminated with pin & ring type ferrules with ferrule numbers marked
at both ends of wiring. CT wiring shall be marked with additional distinct Red tags on
both ends. All secondary wiring shall be terminated by using Wago make (cage clamp
type) terminal blocks.
8.9 CABLE BOX
a. The VCB's shall be provided with suitable and identical cable boxes for
connection Single / dual runs of 3 core, 11kv XLPE cables of size up to 240
mm 2 approaching vertical from below. The cable shall be so located at
convenient height to facilitate easy cable jointing/termination work.
b. The access for the isolator cable box shall be from side and the access for the Teeoff
cable box shall be from rear side and distanced of bottom level of wiping
gland from ground shall be maintained at 350 mm (minimum)
c. The cable boxes shall be with detachable front cover for ease of termination &
shall be interlocked with Switch position (i.e. when isolator is in Earth / OFF
position.
d. The design of the cable box shall be such that any type of jointing methods such
as heat shrinkable/push on type /cold shrinkable type termination’s can be
adopted.
8.10 EARTHING
a. All units shall have a special earth bar with a sectional area of not less than 100
mm 2 run along the whole of metal enclosed Switch structure, each end being
connected to the main earthing system where metal cases are used on instruments
these shall be connected to this bar by conductors of not less than 16mm 2 section.
b. A mechanical ‘ON/OFF’ indicator shall be provided on isolators and VCB
breaker to indicate whether Switch is ON of OFF.
8.11 REMOTE MONITORING & CONTROL PANEL
a. A separate remote monitoring and control Panel, Pre Fabricated Make of Elsteel,
BCH or Rittal (PS), only shall be provided with all fixing accessories originally
supplied by the enclosure manufacturer. This panel shall have manual control
features for switching ON /OFF of equipments with indications and suitable
interlocks & feed back.
b. The Panel shall be located around 100 mtrs away from the system. All the
necessary control cables and its integration shall be provided.
8.12 OTHERS
a. All foundation bolts, nuts, washer for installation shall be supplied by the
manufacturer.
b. Removable eye bolts shall be provided to facilitate the handling of the cubicles
c. Labels: All cubicles shall be clearly labeled as required indicating where
necessary for their purpose and “ON” / “OFF” lettered on brass, enamel iron or
other suitable materials. Name plate shall be of Aluminium sheet of 2 mm thick
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