PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

19.34 Illumination Level and Circuit Loading.
(d) Illumination level of the pump house indoor and outdoor areas shall be designed on
the basis of IS : 3646 with average minimum illumination level of 250 lux within the
pump house. The outdoor area shall be provided with average illumination level of
15-20 lux. 100 % spare capacity for the lighting loads and fixtures shall be provided
both at the indoor and outdoor areas.
(e) Voltage drop at the fixture from the MLDB bus shall not exceed 3%.
(f) Circuit loading of each lighting Panel shall be done in such a way that almost
balanced loading in all the three phases is achieved.
(g) At least two sub circuits shall be used for illumination of a particular area.
19.35 Specific Requirement.
Lighting Fixtures.
Lighting fixtures shall be designed for minimum glare. The surface finish shall be
smooth, unobtrusive and scratch resistant.
Reflector shall be of sheet steel or aluminium of minimum 20 SWG thick, securely
fixed by fastening device of captive type.
Fixture shall be suitable for 20 mm conduit entry and 16 SWG G.I. earth wire
connection.
High bay fixtures shall have provision for vibration damper to ensure rated lamp
life.
Fixture shall be furnished complete with lamps and integrally/not-integrally or
separately mounted control gear & accessories as applicable for different types of
fixtures. These shall include holders, ballast, capacitor, starter, igniters etc.
DTS : Detailed Tender Specification. Page 210