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European Safety Systems Ltd.
Impress House, Mansell Road, London, W3 7QH, UK [email protected] Tel: +44 (0)208 743 8880
www.e-2-s.com Fax: +44 (0)208 740 4200
Document No. D191-00-251-IS-SC_Issue_E
27/04/2018
Sheet 3 of 7
* Flash rates Public Mode Fire
# nominal rms current at nominal voltage
## max. rms current at worst-case voltage in voltage range.
Surge Current for Fire Alarm use per UL Listing
Surge Currents
Model
Nom.
Voltage
Voltage
Range
Flash Rate Setting
Init, Peak Surge
Current (A)
Init. RMS Surge
Current (mA)
D1xB2XH1DC024
24Vdc
20-28Vdc
1Hz (60fpm)
1150 mA
697 mA
1.5Hz (90fpm)
1100 mA
742 mA
1.33Hz (80fpm)
1090 mA
680 mA
Double flash
1070 mA
639 mA
D1xB2XH2DC024
24Vdc
20-28Vdc
1Hz (60fpm)
1590 mA
1180 mA
1.5Hz (90fpm)
1590 mA
1120 mA
1.33Hz (80fpm)
1710 mA
1130 mA
Double flash
1650 mA
1200 mA
Surge current given at worst case voltage
Installation
There are no restrictions on unit orientation.
Safe Installation Requirements
To maintain the ingress protection rating and mode of protection, the cable entries must be fitted with suitably rated cable
entry and/or blanking devices during installation. If conduit is used for installation, seal conduit within 18 inches from the
enclosure.
If entries are fitted with adaptors they must be suitably rated for the application. Fitting of blanking elements into adaptors
is not permitted.
Connections are to be made into the terminal blocks using solid or stranded wire, sizes 0.5-2.5mm2 / AWG 20-14. Wire
insulation needs to be stripped 6-7mm. Wires may be fitted securely with crimped ferrules. Terminal screws need to be
tightened down with a tightening torque of 0.4 Nm / 3.5 Lb-in.
Earthing connections should be made to the Internal Earth terminal in the explosionproof chamber or the external earth
stud.
Check that the ‘O’ ring seal is in place before replacing the explosionproof cover.
Selection of Cable, Cable Glands, Blanking Elements & Adapters
When selecting the cable size, consideration must be given to the input current that each unit draws (see Table), the number of
beacons on the line and the length of the cable runs. The cable size selected must have the necessary capacity to provide the input
current to all of the sounders connected to the line.
When selecting the cable size consideration must be given to the voltage drop over the length of the cable run to ensure the min. input
voltage at the point of use (voltage range)
The voltage drop depends on:
-
The total current draw if the devices installed on this cable run
-
The wire size and total length of the cable run, determining the total resistance of this cable run
-
The minimum output voltage supplied by the power supply
The voltage drop and input voltage at the point of use can be calculated.
Total Wire resistance =
Wire resistance / 1000ft x length of cable run x 2
