CBS Presentation

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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Mandatory Locations :(as per the BS5266 Pt. 7EN1838 and BS5266 Pt. 8 EN50172)


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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: 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

Documents

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