BA-en-4003-2005_TUE30
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2.5 Special arrangements according to the declaration of
conformity
• A potential equalization system (PA) has to be set up along the com-
plete measuring circuit.
• In areas in which dust is likely to cause explosive atmospheres, only
appropriately certified equipment marked "D" may be connected to the
measuring circuit.
• In areas in which gas is likely to cause explosive atmospheres, simple
electrical apparatus like clamps and cable rewinders may be connected
to the measuring circuit. The simple apparatus must comply with the
appropriate requirements of EN 60079-11, but must not be certified and
marked.
• The intrinsically safe measuring circuit may also be guided into the
explosion hazard zone in which Class 1 operational equipment is
required. In this zone, sparks generated under field conditions by the
use of connected equipment (e.g. measuring clamp) are not permitted.
Ex!
