Volume-IF - JantERmantER

TITLE:
LIGHTING DISTRIBUTION BOARD
& LIGHTING PANEL
SPECIFICATION NO. PES-558-01A
VOLUME - II B
SECTION - D
REV.NO. 0 DATE
SHEET 1
OF
3.2.3 Independent gasketted hinged door with operating handle shall be provided for
access to transformer & its taps. Operating handle shall have built-in key locking
arrangement.
3.2.4 Suitable ventilation arrangement for the transformer compartment to dissipate the
heat of the transformer shall be provided. The arrangement shall be in the form of
louvers and the same shall be provided with galvanized wire mesh with dust catchers
on the inside.
3.2.5 The degree of protection for transformer compartment shall be IP:42 unless
mentioned otherwise in Data Sheet A.
3.2.6 Connections between transformer secondary terminals and the busbars shall be
made by using PVC insulated flexible copper cables or busbars.
3.2.7 Warning plate shall be provided on transformer enclosure. The inscription of warning
plate shall be as given below:
- DO NOT OPEN DOORS WHEN ENERGISED
- KEEP TAPS AT SAME POSITION FOR ALL PHASES
3.2.8 Transformer enclosure shall be provided with a danger plate.
3.3 Lighting Transformer
3.3.1 Lighting transformer, where specified shall form an integral part of lighting distribution
board.
3.3.2 Lighting transformer shall be dry type, natural air cooled and suitable for mounting
inside the lighting distribution board. Transformer shall be non-encapsulated type,
unless specified otherwise in Data Sheet A.
3.3.3 Rating of transformer shall be 50 kVA as per type of LDB.
3.3.4 Voltage rating shall be given in Data Sheet A.
3.3.5 Percentage impedance shall be 3% for 50kVA and 4% for 100 kVA transformers,
unless specified otherwise in Data Sheet A.
3.3.6 Off circuit tap changers/links shall be provided for + 5% in steps of 2.5%.
3.3.7 Transformer winding insulation shall be class “F” or better.
3.3.8 Transformer shall be of vector group Dynl.