52
Mounting and Operating Instructions CEAG Battery Cabinets
40071860035 (N) March 2016 www.ceag.de
6 Installation
6.2.3.1 Ventilation requirements
Ventilation of electrical rooms
Dimensions of ventilation acc. to EN 50272-2.
The minimum air flow rate for ventilation of a battery location
or compartment shall be calculated by the following formula:
Q = 0.05 x n x Igas x CN x 10-3 [m
3
/h]
Q = needed air volume flow in m
3
/h
0.05 = fixed factor
n = no. of accumulator cells
Igas = current in mA per Ah, fits 8 mA per Ah for Iboost with
VRLA batteries
CN = capacity C10 for lead acid at 20 °C
Example for needed air volume flow of ZB-S with 155.6 Ah
lead acid battery:
Q = 0.05 x n x Igas x CN x 10-3
Q = 0.05 x 108 x 8 x 155.6 x 10-3 m
3
/h
Q = 6.72 m
3
/h
In order to ensure the air volume flow of 6.72 m3/h, the air
inlets and outlets in the electrical distribution room must
have the following min. cross-sections acc. to EN 50272-2.
Vent cross-section of the air inlets and outlets:
A • 28 x Q
A • 28 x 6.72 m
3
/h
A • 188.21 cm
2
The required vents in the F90 walls must be guarded by fire
protection measures, e.g. F90 fire shutters.
As the calculation shows, the use of even the largest batte-
ry does not require an elaborate technical ventilation (e.g.
explosion protected fans).
Due to the installed maintenance-free, sealed lead acid gas
recombination batteries no further special constructional
requirements such as a floor resistant to electrolytes or a
floor covering (tiles) etc. have to be met.
VRLA valve regulated lead acid monobloc batteries can operate
in any position. Except on top.
Chart 9
Calculation of ventilation of electrical rooms acc. EN 50272-2 (calculated for boost charge!):
6.2.3.2 Close vicinity of the battery
From EN 50272-2: “…In the close vicinity of the battery the
dilution of explosive gases is not always secured. Therefore
a safety distance extending through air must be observed
within which sparking or glowing devices (max. surface tem-
perature 300°C) are prohibited. The dispersion of explosive
gas depends on the gas release rate and the ventilation close
to the source of release.
6.2.4 Electrical requirements (protection, insulation,
resistance, etc.)
To prevent a build-up of static electricity when handling batte-
ries, clothing/materials, safety boots and gloves are required
to have a surface resistance 108 Ohm and an insulation
resistance of 105 Ohm.
From EN 50272-2: “…To be resistant against environmental
influences, like temperature, wetness, dust, gases, vapours
and mechanical loads, the minimum insulation resistance
between the battery´s circuit and other local conductive
parts should be greater than 100 Ohm/V (of battery nominal
voltage) corresponding to a leakage current < 10 mA.”
Note:
„Before an inspection separate the battery system from
the fix installation and check if there is a dangerous voltage
between the battery and its rack or cabinet. ...“
With battery system > DC 120 V the rack or cabinet made
of metal has to be connected to a protective conductor or
there is a protection insulation against the battery and the
mounting location. (Chapter 5.2 in EN 50272-2)
This insulation must withstand 4000 V for one minute.
Note:
Protection against direct and indirect touching can be used
for battery units with a rated voltage <= DC 120 V. In this
case the requirements of metallic battery racks and cabinets
are not valid (acc. to 5.2 in EN 50272-2).
Touch protection must be provided for all active parts at
voltages > 60 V DC with insulation, covers and distance.
6.2.5 Installation
Batteries shall be installed in clean, dry locations. They must
be secured against falling items and dirt.
Battery capacity C10
at 1.8 V/Z and +20 °C [Ah]
5.5
8.5
14.0 23.3 32.0 39.8 50.4 53.7 66.2 85.7 89.4 106.0 118.0 143.1 155.6 178.8 195.4 245.0 268.2 308.0 357.6
Air volume flow req. for
the ventilation of the place
of installation [m
3
/h]
0.24 0.37 0.60 1.01 1.38 1.72 2.18 2.32 2.86 3.70 3.86 4.58 5.10 6.18 6.72 7.72 8.44 10.58 11.59 13.31 15.45
Vent cross-section
of the air inlets and
outlets of the place of
installation [cm
2
]
6.6 10.3 16.9 28.2 38.7 48.1 61.0 65.0 80.1 103.7 108.1 128.2 142.7 173.1 188.2 216.3 236.4 296.3 324.4 372.6 432.5
