Explosion Protection; Electromagnetic Compatibility - Siemens SIWAREX JB Compact Operating Instructions

Technical data

6.3 Explosion protection

6.3 Explosion protection
In hazardous areas, it is only permitted to use components with the appropriate Ex approval.
The junction box can be used in hazardous areas even for connecting an intrinsically safe
circuit according to EN 60079-14 or EN 61241-14.
In zone 20, certified circuits in category ia, ib or iaD, ibD are permitted.
The terminals meet the requirements for disconnecting intrinsically safe circuits: The
creepage distance and clearance are greater than 8 mm.
Only connect the device to circuits that comply with the technical data specified on the
nameplate or on the certificates and approvals (e.g., the EC-type examination certificates). If
the circuits do not comply with the information in the certificates and approvals, then the
safety required for the approval is longer guaranteed.
When using the junction box for type of protection nA, the junction box must be included in
the local potential equalization. The external and internal connection in the cover must be
used for this purpose. Use a cable eye that is crimped to the cable to do this. The minimum
cross-section of the PAL connecting cable must be the same or greater than the cross-
section of the phase conductor. The washer that is also to be used must ensure that the
contact pressure is permanently maintained. The four cover screws must be screwed tight.
Before loosening the cover screws, all of the circuits must be de-energized.
The circuits that are connected must be either only intrinsically safe or only non-intrinsically
safe. Mixing is not allowed.
If the SIWAREX JB junction box is operated with the marking
II 1 D Ex tb + ib IIIC T85°C Da IP66 in hazardous zone 20, then the feeding circuit must
meet the requirements of protection type "intrinisically safe" Cat. ia or Cat. ib in connection
with another recognized protection type.
6.4

Electromagnetic compatibility

The SIWAREX JB junction box meets the following EMC requirements:
● EN 61326: 1999
● EN 45501: 1992
● NAMUR NE21: 2004
To maintain the electromagnetic compatibility, for example,
● ensure that the cables are routed with electromagnetic compatibility (even within
● lay the signal cable segregated from cables with voltages > 60 V or high currents.
● avoid sites neighboring large electrical systems
20
cabinets!).
SIWAREX JB stainless steel with ATEX certificate
Compact Operating Instructions, 06/2010, A5E01257284C-01