_______________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH www.e2s.com Tel: +44 (0)208 743 8880
Document No. D202-00-501-IS
Issue 1 28-01-2024 Sheet 4 of 9
Call Point Cover
Call Point Base
M6 x 60 Cap head Cover Bolts - 4 off Positions
Fig. 2 Accessing the Enclosure.
Check that the earth bonding wire between the two castings
is secure and the ‘O’ ring seal is in place.
When replacing the cover casting ensure that it is square with
the chamber casting before inserting. Carefully place the
cover on the base. Only after the cover is fully in place should
the four M6 x 60 cover bolts and their spring washer be
tightened down. Never use the cover bolts to force the cover
into position.
8) Earthing
The units are provided with internal and external earth
terminals which are mounted in the base of the unit.
Internal earthing connections should be made to the Internal
Earth terminal in the base of the housing using a ring crimp
terminal to secure the earth conductor under the earth clamp.
The earth conductor should be at least equal in size and
rating to the incoming power conductors.
Fig 3 Earth terminals
9) Power Supply Selection
Electrical Ratings
Input terminals and Zener Barrier or Galvanic
Isolator
Power is supplied to the call point is via the + and –
terminals. All terminals have the following input safety
parameters:
Ui
=
30V
Ii
=
500mA
Pi
=
1100mW
Ci
=
0
Li
=
0
The unit may be powered from an ATEX/IECEx/UKEx
certified Zener barrier or galvanic isolator which have output
parameters equal to or less than 30V, 500mA and 1100mW,
where Io is resistively limited. The cable parameters stated
on the selected Zener barrier or galvanic isolator certificate
must be observed.
10) Selection of Cable. Cable Glands, Blanking
Elements & Adapters
ATEx/IECEx & UKEx Installations:
The equipment must only be installed by suitably qualified
personnel in accordance with the latest issues of the relevant
standards:
EN60079-14 / IEC60079-14: Explosive atmospheres -
Electrical installations design, selection and erection
EN60079-10-1 / IEC60079-10-1:
Explosive atmospheres -
Classification of areas. Explosive gas atmospheres
The installation of the units must also be in accordance with
any local codes that may apply and should only be carried
out by a competent electrical engineer who has the
necessary training.
For high ambient temperatures the cable entry temperature
may 70ºC or the cable branching point temperature
may exceed 80ºC and therefore suitable heat resisting cables
and cable glands must be used, with a rated service
temperature of at least the values stated below:
For models GNExCP7-BG-I:
Max. ambient
temperature ºC
50 55 60 65 70
req. Cable / Cable
Gland rating: ºC
76 81 86 91 96
For models GNExCP7-BG-IR:
Max. ambient
temperature ºC
40
45
50 55 60 65 70
req. Cable /
Cable Gland
rating: ºC
85 90 95 100 105 110 115
NEC / CEC Installations:
The installation of the units must also be in accordance with
any local codes that may apply and should only be carried
out by a competent electrical engineer who has the
necessary training. In compliance with the National Electrical
Code NFPA 70 or Canadian Electric Code CSA22.1
Wiring terminal
Internal Earthing
External Earthing
