ARMTEL DWEx - Explosion-Proof

DWEX DIGITAL LOUD-SPEAKING EXPLOSION PROOF CALL STATION
User Manual
page 18/40 armtel.com
© Armtel info@armtel.com
1.5 Explosion-proof
1.5.1 Compliance with the requirements of TR TS ТС 012/2011 "On safety equipment
for use in potentially explosive atmospheres" and ATEX 2014/34/EU to meet the requirement
of interstate and national standards.
1.5.2 Explosion protection type "e" in DWEx is provided by:
– Compliance with the requirements of ГОСТ Р МЭК 60079-7-2012 (EN 60079-
7:2015) for electrical installation leakages and electrical gaps;
– Temperature limits on the surface of the enclosure, the cover and on electrical
contacts to a maximum level of not more than +85 °C according to group T6 to
GOST 31610.0-2014 (EN 60079-0: 2012);
– Use of Ex-components in the equipment, such as explosion-proof cable glands
series 8161 manufactured by STAHL and explosion-proof terminal blocks
STS 2.5 TWIN manufactured by Phoenix Contact.
1.5.3 Explosion protection type "d" in DWEx is provided by putting its electrical
circuits in an explosion-proof shell made in accordance with GOST IEC 60079-1-2011 (EN
60079-1:2014).
Explosion-proof box DKV-3 made of aluminum alloy is used as the shell. The cable
outlet from the explosion-proof box is made through Ex-cable gland marked Ex d IIC
During the manufacturing process, the explosion-proof box DKV-3 is tested for
explosion resistance in accordance with GOST IEC 60079-1-2011 (EN 60079-1:2014) with the
pressure 1.5 times higher than the pressure of the explosion.
Wiring is carried out by a cable of 0.5 mm
2
cross-section for each core and with
reinforced insulation, which withstands the test voltage of 3000 V AC without breakdown.
The tightness of the connection and the compliance with the requirements of explosion
protection are ensured by the use of Ex-cable glands having the necessary certificates.
The box covers are protected from self-unscrewing by means of locking screws.
1.5.4 Explosion protection type "ib" is provided by limiting the parameters of
the electrical circuits to intrinsically safe values, which meets the requirements of
GOST 31610.11-2014 (EN 60079-11:2012).
Blocks of spark protection on zener diodes, in conjunction with current-limiting
resistors, limit the voltage and current in the electrical control and power supply circuits and
circuits in emergency mode to the safe level specified in GOST 31610.11-2014 (EN 60079-
11:2012).