User's Manual

Chapter 2 Installation Preparations
2-3
3. Cleanness
Cleanness is related to the amount of dust and harmful gases in the air. The
equipment room should meet the following cleanness requirements:
z No explosive, conductive, magnetic or corrosive dust.
z Density of the dust whose diameter is larger than 5µm must be less than or equal
to 3*10
4
particles/m
3
.
z No corrosive metal or gas that is harmful to insulations, such as SO2, NH3.
z The equipment room should be always kept clean, with the doors and windows
properly sealed.
4. Lighting
The equipment room should be equipped with 3 types of lighting facilities:
Common lighting, guaranteed lighting and emergency lighting.
5. Fire-proof requirements
The paint and decoration materials in the equipment room should be fire-proof.
The cabling holes through the wall should be filled with fire-retardant materials.
Fire-fighting devices should be equipped at the appropriate positions.
2.1.3 Checking the Power Supply System
1. DC power supply requirements:
1) BTSB employs -48V DC power supply so the equipment room should be
equipped with an AC/DC power supply converter for working power supply.
The DC voltage is allowed to range from -57V to -40V.
2) To guarantee uninterrupted operation of the BTSB even in case of mains supply
failure, uninterrupted power supply facilities such as diesel engine generator
group and storage battery should be available.
3) The noise level indices of DC power voltages shall meet the technical
specifications by the former Ministry of Posts and Telecommunications.
4) The DC power supply should be provided with over-voltage/over-current
protection and indicators.
2. AC power requirements (including the AC power for construction purpose and