E2S BExBG15D Manual De Instrucciones página 3

The input current will vary according to the voltage input
level. The current levels shown above are for nominal input
voltage. The 12V, 24V and 48V DC units have a converter
circuit and therefore the input current level will decrease
slightly as the input voltage in increased and will increase
slightly as the input voltage is reduced.
The above table also shows the maximum voltages at which
the beacons can be operated.
9)
Cable Selection
When selecting the cable size consideration must be given to
the input current that each unit draws (see table above), 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 beacons
connected to the line.
SAFETY WARNING: If the BExBG15D and BExBG10D
beacons are used at high ambient temperatures, i.e. over
+40ºC, then the cable entry temperature may exceed +70ºC
and therefore suitable heat resisting cables must be used,
with a rated service temperature of at least 110ºC.
10)
Earthing
Both AC and DC beacon units must be connected to a good
quality earth. The units are provided with internal and
external earthing terminals which are both located on the
terminal chamber section of the unit (see figures 2 and 3).
When using the internal earth terminal ensure that the
stainless steel M4 flat washer is between the incoming earth
wire and the enclosure.
When using the external earth terminal a cable crimp lug
must be used. The cable lug should be located between the
two M5 stainless steel flat washers. The M5 stainless steel
spring washer must be fixed between the outer flat washer
and the M5 stainless steel nut to ensure that the cable lug is
secured against loosening and twisting.
The internal earth bonding wire ensures that a good quality
earth is maintained between the flameproof chamber casting
and the flameproof cover casting.
BExBG15D and BExBG10D Beacon Cover Internal
View
_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. IS 2459-P
Internal Bonding
Wire Terminal
2 off M20
Cable Entries
Internal Earth Terminal
Figure 3
Issue E 12-03-10
11)
Cable Glands
The BExBG15D and BExBG10D beacons have dual cable
gland entries which have an M20 x1.5 entry thread as
standard. Only cable glands approved for Ex 'd' applications
can be used, which must be suitable for the type of cable
being used and also meet the requirements of the Ex 'd'
flameproof installation
IEC60079-14:2007.
When only one cable entry is used the other one must be
closed with an Ex 'd' flameproof blanking plug, which must be
suitably approved for the installation requirements.
For combustible dust applications, the cable entry device and
blanking elements shall be in type of explosion protection
increased safety "e" or flameproof enclosure "d" and shall
have an IP 6X rating according to EN60529:1992.
SAFETY WARNING: If the BExBG15D and BExBG10D
beacons are used at high ambient temperatures, i.e. over
+40ºC, then the cable entry temperature may exceed +70ºC
and therefore suitable heat resisting cable glands must be
used, with a rated service temperature of at least 110ºC.
12)
Cable Connections
The cable connections are made into the terminal blocks on
the electronic pcb assembly located in the flameproof
enclosure. See section 7 of this manual for access to the
flameproof enclosure. A four-way terminal block is provided
on both AC and DC beacons. Therefore there are two live
terminals and two neutral terminals for the input and output
wiring on AC units. On the DC units there are two +ve
terminals and two -ve terminals for the input and output
wiring.
BExBG15D and BExBG10DD 15 and 10 Joule Beacons
Flip / Flop
Terminal
Header
Wires having a cross sectional area of up to 2.5mm² can be
connected to each terminal way. If an input and output wire is
required a 2.5mm² wire can be connected to each terminal
way. When connecting wires to the terminals great care
should be taken to dress the wires so that when the cover is
inserted into the chamber the wires do not exert excess
pressure on the terminal blocks. This is particularly important
when using cables with large cross sectional areas such as
2.5mm².
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Sheet 3 of 4
standard EN60079-14:2008
Supply
Terminals
Figure 4
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