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2.5 Intrinsically safe installation
Control units type MEP3* and head amplifier units to type MEP3** and ***S*P*H** are approved by
ATEX as intrinsically safe equipment to II 1 G Ex ia IIC. Refer to safety instruction IP221/SI and local
code of practice.
The following points must be noted when installing these units:-
i) The cable from the head amplifier to the control unit must be screened, and the screen must be
connected at the control unit end only.
ii) On I.S systems the cable from sensor to head amplifier must be less than 15 meters long. If more
than 3 meter is required, special cable must be used.
iii) The control unit must be earthed using at least 4mm
2
wire. All screen earth and main earth
connections must be commoned. In the case of the rack unit, MEP3B, the chassis must be
earthed and each unit connected independently to the chassis earth.
iv) I.S. cables must exit the control separately from the mains and relay cables.
v) It is the responsibility of the installer to ensure that local codes of practice are followed.
Intrinsically Safe Electropulse is approved by ATEX & standards EN50014 and EN50020.
The certificates are listed below:
Description
Certificates of Conformity
MEP3 L
MEP3 R/MEP3 B
Sensor & Head Amplifier
Adjacent Amplifier
Sensors (separate)
Approval
Code
II (1) G [EExia] IIC
II 1 G EExia IIC T4
II 1 G EExia IIC T4
II 1 G EExia IIC T4
To Standard
EN 50014 & EN 50020
EN 50014 & EN 50020
EN 50014 & EN 50020
EN 50014 & EN 50020
Table 2.2 - Approvals