For example, it is easy to classify the entire hall as the environment with explosion hazard than looking for the places with real risk of explosive atmosphere occurrence, however, this can turn into a problem if you are forced to nonsensical replacement of electrical wiring that will cost you hundreds of thousands.
Types of external influences
A key document which is the prerequisite for every occupancy permit-related proceedings as well as for every regular electrical equipment inspection. Few people can correctly determine the external influences in premises with explosion hazard. We can do that.
Individual external influences can be divided into three main groups designated with letters:
- A - external influence environment
- B - utilization
- C - construction of buildings
Codes of external influences
|
A - external influence environment |
||
|
AA |
Ambient temperature |
AA1 to AA8 |
|
AB |
atmospheric conditions |
AB1 to AB8 |
|
AC |
Altitude |
AC1 / AC2 (in Czech Republic always AC1 - below 2000 m) |
|
AD |
Presence of water |
AD1 to AD8 (influences the IP protection) |
|
AE |
Presence of solid bodies |
AE1 to AE6 |
|
AF |
Presence of corrosive or polluting substances |
AF1 to AF4 |
|
AG |
Mechanical load – shock |
AG1 to AG3 |
|
AH |
Mechanical load – vibrations |
AH1 to AH3 |
|
AJ |
Other mechanical loads |
(not determined) |
|
AK |
Presence of flor and/or molds |
AK1 or AK2 |
|
AL |
Presence of fauna |
AL1 or AL2 |
|
AM1 to AM41 |
Electromagnetic, electrostatic, or ionizing influences |
determined at places where such influences can be expected |
|
AM8 |
radiated magnetic fields |
AM8-1 or AM8-2 |
|
AM9 |
Electric field |
AM9-1 to AM9-4 |
|
AM31 |
Electrostatic discharge |
AM31-1 to AM31-4 |
|
AN |
Solar radiation intensity |
AN1 to AN3 |
|
AP |
Seismic effects |
AP1 to AP4 (AP1 only in CZ) |
|
AQ |
Lightning level and density |
AQ1 to AQ3 |
|
AR |
Movement of air |
AR1 to AR3 |
|
AS |
Wind |
AS1 to AS3 |
|
B - utilization |
||
|
BA |
Capability of persons |
BA1 to BA5 |
|
BB |
Electrical resistance of human body |
(not determined) |
|
BC |
Contact of persons with earth potential |
BC1 to BC4 |
|
BD |
Conditions of evacuation in case of emergency |
BD1 to BD4 |
|
BE |
Nature of processed or stored materials |
BE1 - No significant risks |
|
C - construction of buildings |
||
|
CA1 |
Construction materials |
CA1 or CA2 |
|
CB |
Building design |
CB1 to CB4 |
Whenever the external influence BE2Nx is determined, this fact has to be reflected, among others, in the fire protection documentation.
Whenever the external influence BE3Nx is determined, this fact has to be reflected, among others, in the Explosion Protection Document.
Knowledge is important for environment determination
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email: info@igniscon.cz