Lamp-holders shall be heavy duty
porcelain mogul type, 600 Volt rating.
Maximum winding temperature in ballast
shall not exceed 130 ํC. Those installed
outside building shall be provided with
Weather-sealed housing to protect
against moisture, corrosion and dust.
The lamps shall be 220V, 1phase, 50Hz,
with Watts ratings as shown in the
drawings or specification.