BOCKWOLDT HELICAL GEAR BOXES BC Series, Operating Instructions Manual

Page: 9 / 70

BOCKWOLDT
Betriebsanleitung
Operating Instructions
Einleitung
Introduction
Betriebsanleitung Ex - 9 -
BOCKWOLDT
1.3.3
II 3 D Ex h IIIB T125°C Dc
(Zone 22)
II 2 G Ex h IIB T4 Gb
(Zone 1)
EPL
(Equipment Protection Level)
Gas : Ga :
category 1G ; Zone 0
Gb : category 2G ; Zone 1
Gc :
category 3G ; Zone 2
Dust : Da : category 1D ; Zone 20
Db :
category 2D ; Zone 21
Dc : category 3D ; Zone 22
Temperature marking
Temperature classes in Gas Ex zones
Temperature limit: T1 : max. 450°C
T2 : max. 300°C
T3 : max. 200°C
T4 : max. 135°C
T5 : max. 100°C
T6 : max. 85°C
Maximum permitted surface temperature
for units in Dust Ex zones: e.g. T125°C
Explosion group
Examples:
IIA : e.g. propane, methane, fuels
IIB : e.g. ethylene, hydrogen sulphide
IIC : e.g. acetylene, hydrogen
IIIA : combustible suspended matter
IIIB : like IIIA and additionally non-conductive dusts
IIIC : like IIIB and additionally conductive dusts
Protection
Motors, e.g. : d : flameproof enclosure
e : increased safety
Gear boxes, e.g.: h : design safety (formerly c)
liquid immersion (formerly k)
control of ignition sources (formerly b)
Potentially explosive atmospheres
G : Gas
D : Dust
Category
3 : Zone 1; Zone 21
3 : Zone 2; Zone 22
Equipment group
II : surface (non-mining) equipment
Markings
: European Union explosion protection marking