Classifications Meeting The Nec 500 - WAGO -I/O-SYSTEM 750 Technical Description, Installation And Configuration

Type "n" ignition protection additionally requires electrical components to be
marked with the following extended identification:
A – non spark generating (function modules without relay /without switches)
AC – spark generating, contacts protected by seals (function modules with
L – limited energy (function modules with switch)
Further information
For more detailed information please refer to the national and/or international
standards, directives and regulations!

6.4 Classifications meeting the NEC 500

The following classifications according to NEC 500 (National Electric Code)
are valid for North America.
6.4.1 Divisions
The "Divisions" describe the degree of probability of whatever type of
dangerous situation occurring. Here the following assignments apply:
Explosion endangered areas due to combustible gases, fumes, mist and dust:
Division 1
Division 2
6.4.2 Explosion protection groups
Electrical components for explosion endangered areas are subdivided in three
danger categories:
Class I (gases and fumes):
Class II (dust):
Class III (fibers):
WAGO-I/O-SYSTEM 750
PROFINET IO
relays / without switches)
Encompasses areas in which explosive atmospheres are to be expected
occasionally (> 10 h ≤ 1000 h /year) as well as continuously and long-term
(> 1000 h /year).
Encompasses areas in which explosive atmospheres can be expected rarely
and short-term (>0 h ≤ 10 h /year).
Use in Hazardous Environments
Classifications meeting the NEC 500
Group A (Acetylene)
Group B (Hydrogen)
Group C (Ethylene)
Group D (Methane)
Group E (Metal dust)
Group F (Coal dust)
Group G (Flour, starch and cereal dust)
No sub-groups
• 221