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Explanation of marking for explosion hazardous area due to Dusts
(Ex tb IIIC T70°C Db):
Ex = Certified for use in explosion hazardous areas
tb = Explosion protection method "protection by enclosure"
IIIC = Equipment group for conductive dusts (including IIIA, IIIB and IIIC dusts)
T70°C = Maximum OUTSIDE surface temperature of the unit is 70 °C (within the ambient temperature
range of -20°C - +55°C)
Db = Explosion Protection Level (EPL) marking for "HIGH" level of protection. Equipment for explosive
DUST atmospheres, which is not a source of ignition in normal operation or during expected
malfunctions
1.3 Standard unit construction
The following list familiarizes you with some common unit features important to recognize:
2P+E: Electrical system having Phase (P), Neutral (N) and Protective Earth (PE). With Extra-Low-
Voltage system is recognized as PELV (Protective Extra Low Voltage)
2P : Electrical system having Phase (P), Neutral (N). With Extra-Low-Voltage this system is recognized
as SELV (Safety Extra Low Voltage). No means for bonding available.
Cable: Standard cable of the SLAM
(PUR) outer sleeve and copper sheathing. PUR withstands well chemicals as well mechanical wearing.
Fuse: SLAM
®
TrafoEx has two fuses for protecting against dangers of electrical e.g shortcircuits of
relating equipment/systems.One of the fuses is in the primary side (L conductor of supply) protecting
against supply failures. One of the fuses is in the secondary side (L conductor) protecting against failures
of relating equipment connected to the sockets of the TrafoEx transformer.
In case of activated fuse protection: Stop the work in hazardous area
immediately until the likely shortcircuit of relating equipment/system has
been identified and corrected.
Shortcircuit is definitely a source of ignition which may cause an explosion !
Other common accessories (optional):
To view options on accessories, please visit
3250
6/16
®
TrafoEx–series is H-FLEX C-PUR. This cable has polyurethane
http://www.atexor.com
for further study or call +358 20 734
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