Mounting And Installation - Ex-Tech Solution ERSA Série Mode D'emploi

8. Mounting and installation

 Check if the data on the label of the enclosure are consistent with the permitted conditions for the
explosive atmosphere of use
o Group II : surface industries
o Category 2
o G
o D
o IPxx
 Before installing and commissioning, ensure that the flameproof enclosure Ex d:
o Is not damaged externally
o The surfaces of the lid which are in contact with the surfaces of the housing have no damage
o The threads of the housing for closing the lid are not damaged
 Check if there is a specific position of mounting
 The wiring of the cable conductors must be made with a particular care

The conductor insulation must reach the terminal. The conductive soul must not be damaged
 Not to exceed the authorized maximal temperature, it is advisable to choose the appropriate cables
and take a particular care in installing them
 Follow the instructions contained in the specifications
 Installation of intrinsic safety elements:
 The installation of the intrinsic safety circuits (IS) inside the enclosure is subordinated to the respect of
the requirements of their documents of certification, their certificates and with that after:
o Circuits IS are cabled with connection wires of which the thickness of insulator is ≥ 0,5 mm and
the section ≥0,5 mm ².
o The connection wires support a dielectric test of 500 V effective.
o The air gap between the active parts under voltage of the connection elements of the intrinsic
safety circuit compared to connection elements of an non intrinsic safety circuit is higher or
equal to 50 millimeters
o The air gap and creepage distances in the air between the active parts under voltage of the
intrinsic safety circuit compared to an intrinsic safety circuit close are higher or equal to 6
millimeters
o The air gap and creepage distances in the air between the active parts under voltage of the
intrinsic safety circuit compared to the metal parts which can be with the ground are higher or
equal to 3 millimeters.
o The active parts of the intrinsic safety circuits support a dielectric test of rigidity under an
effective alternating voltage of 500 Volts compared to the metal mass
o The active parts of an intrinsic safety circuit support a dielectric test of rigidity under an effective
alternating voltage of 500 Volts compared to an intrinsic safety circuit close.
o Circuits NIS are cabled with conductive wires whose insulation is such as they can support a
dielectric test of 2 U + 1000 V effective, U being the sum of the tensions of the IS and NIS
circuits, with a minimum of 1500 V
o
The sketch below shows the requirements of intrinsically safe devices
1. Isolating IS and Non-IS circuits
Cable core
IS Non-IS
2 cable ducts
Metallic screen earthed
IS Non-IS
1 duct and metallic screen
ERS003A12–07 01/12/2016
: high level of protection
: for Gas
: for Dusts
: IP rating (waterproofness for solids and liquids)
Insulating wall
IS Non-IS
Duct with insulating wall
≥ 8 mm
Flanging
IS Non-IS
Duct with cables flanging
Operating instructions
Flameproof enclosure - ERSA series
2. Clearance and creepage distances between IS and Noni-IS
devices
≥ 3 mm
≥ 3 mm
ENG
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