CBS Presentation
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Transcript of CBS Presentation
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8/12/2019 CBS Presentation
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EMERGENCY LIGHTING
CENTRAL BATTERY SYSTEMSANTHI MATHAI
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EMERGENCY LIGHTING CENTRAL BATTERY
SYSTEM
Feeds theEmergencyand Exit Lightsvia sub-
distributionboards from acentralizedsupply source.
Design life of20+ years
Easy
Maintenance
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AC/DC Central Battery System
S
Charger/Rectifier
Battery Bank
Contactor
Load
Input
from
mains
CBS
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Static Inverter System
S S
Charger/Rectifier
Battery Bank
Inverter
Contactor
Load
Input
from
mains
CBS
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Schematic of Central Battery System
CBS
ELDB
ELDB
SS1
SS2
SS3
SS4
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Important Points to note about CBS
CBS are Passive Standby devices connected to
the mains as opposed to the UPS which are on
Active Standbyconnected to the loads
As per the BS5266 Pt. 9 EN 50171, in the event of amains failure, a CBS should have a delay time of min
0.4s in order to notify the occupants that the mains
have failed
Local regulations require the CBS to have a back upof 3 hours at least
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Central Battery Design: Luminaire
Standards: BS5266 Pt.8 EN 50172 and BS5266 Pt. 9 EN
50171
a. Non-maintained Luminaireb. Maintained Luminaire
c. Converted Luminaire
Altogether called Slave Luminaire since fed by a CBS.
Uniform ratio of 40:1 from max to min illuminated
areas.
Escape routes must have at least 1lux
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Central Battery Design: Luminaire
Mandatory Locations :(as per the BS5266 Pt. 7EN1838 and BS5266 Pt. 8 EN50172)
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Central Battery Design: Luminaire
Additional Emergency lighting should be provided
in the following areas :
1. Lift Rooms2. Escalators
5. Generator, Control or Plant rooms
6. Covered car parks
7. External escape routes
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Central Battery Design: Size of System
Make a list of all the luminaires to be connected and note thequantity of fittings of each type.
Establish the electrical supply details for each luminaire type (thecircuit watts and the circuit VA)
Multiply each of these by the quantity of luminaires
Find the total Circuit wattage requirement and the total circuit VArequirement.
Add an allowance (recommend a minimum of 20%) for voltage dropdue to cabling or future expansion
Select a unit from the product list opposite which is capable ofsupplying both the required VA rating and the required wattage
rating.
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Central Battery Design: Size of System
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Central Battery Design: Size of System
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Central Battery Design: Battery & Cable
Battery
Valve Regulated Lead Acid Battery (SLA)
Nickel-Cadmium Battery
Lead Acid Plante
Cables
Fire Protection of cables
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Conclusion
CBS works in conjunction with Fire EngineeringSystems
Depending on the building layout, a modular
approach help reduce cost. E.g. a 100kVA CBS ismore expensive than a 5x10kVA CBS
Efficient CBS : Design and Maintenance
Central Battery Systems help save LIVES