ABB MS116 Manual page 11

1.7.5 Equipment categories
Equipment categories are used in the ATEX directive. The category indicates which safety level must be used in each
zone. In zone 0/20, category 1 devices must be used; in zone 1/21, category 2 devices; and in zone 2/22, category 3
devices. Classification into categories is particularly important, because all the inspection, maintenance and repair
duties of the end user will depend on the category of the product/equipment, not on the zone where it is installed.
1.7.6 Equipment protection levels (EPL)
The latest revisions to the IEC and EN standards include the concept of "equipment protection levels" (EPLs), which
identify products according to the ignition risk they might cause. The EPL also considers the potential consequences
of an explosion. For zone 0/20, the equipment protection level required would be "a"; for zone 1/21, it would be "b";
and for zone 2/22, the level would be "c".
1.7.7 Select the device type according to the zone and category/EPL
Standard
IEC 60079-0
EN 60079-0
Group
I
(Mines)
II
(Gas)
III
(Dust)
1.7.8 Manual motor starters in potentially explosive atmospheres
Manual motor starters (e.g. MS132 and MS165) are authorized under device group II, category (2) in the "G" area (ar-
eas with potentially explosive gas, steam, smoke or air mixtures) and additionally for the "D" area (areas with
combustible dust).
BVS 15 ATEX F 004
II (2) G IECEx BVS 17.0070
II (2) D [Ex]
Manual motor starters are not suitable for installation and/or operation in potentially explosive areas. It is intended
to protect a motor which is installed in the potentially explosive atmosphere. When using the devices in potentially
explosive areas, preventive measures must be taken, e. g., operation within a suitable enclosure.
Notes:
−
For explosion-proof applications, the efficiency of the installed protection devices must be verified prior to
commissioning!
−
The protection function of the device is the thermal overload protection and protection against short-cir-
cuits in the motor. In case of an overload trip, the motor is switched off by opening the main contacts of the
manual motor starter.
−
The safe state is the "tripped state", i.e., turning the handle to the 0-position or trip position.
APR I L 19
MA N UA L MOTOR START ER G UI D E
EPL Protection level
Ma Very high The zone classification is
Mb High
Ga Very high
Gb High
Gc Enhanced
Da Very high
Db High
Dc Enhanced
Table 1: Select the device type according to the zone and category/EPL
Zone according to
IEC 60079-10-x
EN 60079-10-x
Zones Equipment group
not used in mines
0
1
2
20
21
22
ATEX Directive
2014/34/EU (previously 94/9/EC)
Equipment category
I
(Mines)
II
(Surface)
M1
M2
1G
2G
3G
1D
2D
3D
1 1/8 0