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
3.9.2 Every metal part other than those forming parts of an electrical circuit shall
connected to the earth bus by means of high conductivity copper wire of size not less
than 2.5 sq. mm cross-sectional area.
3.9.3 Doors shall have a flexible copper wire for earth connection to fixed unit.
3.9.4 Each LDB shall be fitted with two earthing studs located in accessible position on
sides for connection of internal earth busbar to the external earthing connection.
3.9.5 Earth busbar shall be brought outside LDB for making external connections.
3.10 Type of LDBs
The LDBs shall be of following type:
a) LDB-H (n) - AC LDB with 100 kVA transformer
b) LDB-F (n) - AC LDB with 50 kVA transformer
c) LDB-N (n) - AC LDB with no transformer
d) LDB-D (n) - DC LDB
NOTE: (n) indicates number of outgoing feeders.
3.10.1 AC LDBs (LDB-H, LDB-F, LDB-N)
Each LDB shall comprise of the following and comply with the enclosed single line
diagrams:
a) One lighting transformer (LDB-H & LDB-F)
LIGHTING SYSTEM
b) One incomer of TP / TPN switch-fuse unit or MCCB / MCCB with neutral link
as per Data Sheet A. It shall be provided on the primary side of transformer
for LDB type LDB-H & LDB-F.
c) Set of busbars with 3 phase and neutral.
d) TPN switchfuse units for each outgoing circuit.
e) Three indicating lamps with fuses for indicating bus supply ON.
f) CT operated ammeter with selector switch.
g) VT operated voltmeter with selector switch.