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Segment Protector
Hazardous Area Installation and Use
3
Hazardous Area Installation and Use
Danger!
Risk of explosion through damaged electronic components
Premature wear of electronic components in a device that was previously used in a general
electrical system can cause sparks that can ignite the surrounding atmosphere.
Never install devices that have already been operated in general electrical systems in electrical
systems used in combination with hazardous areas!
3.1
Installation in Zone 2, no Live Maintenance at Trunk and Spurs (Ex nAc)
For non-intrinsically safe Zone 2 circuits, live maintenance on the trunk or spurs must only be
carried out with hot work permit.
No special safety requirements exist for the host interface provided the host itself is installed in
the safe area. If the host interface is installed in Zone 2, a declaration of conformity must be
provided.
Field devices and Segment Protectors are located in Zone 2 and therefore need to be certified
for non-sparking protection (Ex nAc). If the fieldbus power supplies are also located in
hazardous area Zone 2, the same requirements apply.
The evaluation of a non-sparking circuit is limited to the maximum voltage of the fieldbus power
supply (U
Segment Protector and field devices. Field devices and Segment Protectors following this
requirement could be either certified for non-sparking apparatus equipment or intrinsically safe
apparatus according to Entity or FISCO.
For the requirements for typical fieldbus products for use in Zone 2 installations refer to the
manual: 'Using Pepperl+Fuchs fieldbus equipment in Zone 2 hazardous area environment'.
This document is supplied separately and can be obtained from the Pepperl+Fuchs Internet
product database.
3.2
Installation in Zone 2 with Live Maintenance at the Spurs (Ex ic,
FISCO ic)
Danger!
Risk of explosion through exposed conductors
Exposed conductors of inadequately fixed cables can cause sparks that can ignite the
surrounding atmosphere.
When installing the device ensure that the cables are securely fixed.
For applications requiring certified output voltages at the spurs in accordance with
IEC 60079–25 (rated as Ex ic or FISCO ic), two solutions are available:
1. The use of dedicated fieldbus power supply modules which safely limit the output voltage
in accordance with IEC 60079–25, using a maximum output voltage level of U
current is limited by the Segment Protector.
2. To take into account the Segment Protector internal voltage limitation, in accordance with
IEC 60079–25, using a maximum output voltage level of U
by the Segment Protector.
12
) which has to be less than or equal to the maximum rated input voltage U
o
of the
i
24 V. The
o
32 V. The current is limited
o
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