List of external influences
From Electrical Installation Guide
Figure E65 below is from IEC 60364-5-51, which should be referred to if further details are required.
Fig. E65 – List of external influences (taken from Appendix A of IEC 60364-5-51)
| Code | External influences | Characteristics required for equipment | |||||
|---|---|---|---|---|---|---|---|
| A - Environment | |||||||
| AA | Ambient temperature (°C) | ||||||
| Low | High | ||||||
| AA1 | - 60 °C | + 5 °C | Specially designed equipment or appropriate arrangements | ||||
| AA2 | - 40 °C | + 5 °C | |||||
| AA3 | - 25 °C | + 5 °C | |||||
| AA4 | - 5° C | + 40 °C | Normal (special precautions in certain cases) | ||||
| AA5 | + 5 °C | + 40 °C | Normal | ||||
| AA6 | + 5 °C | + 60 °C | Specially designed equipment or appropriate arrangements | ||||
| AA7 | - 25 °C | + 55 °C | |||||
| AA8 | - 50° C | + 40 °C | |||||
| AB | Atmospheric humidity | ||||||
| Air temperature (°C) | Relative humidity (%) | Absolute humidity (g/m3) | |||||
| Low | High | Low | High | Low | High | ||
| AB1 | - 60 °C | + 5 °C | 3 | 100 | 0.003 | 7 | Appropriate arrangements shall be made |
| AB2 | - 40 °C | + 5 °C | 10 | 100 | 0.1 | 7 | |
| AB3 | - 25 °C | + 5 °C | 10 | 100 | 0.5 | 7 | |
| AB4 | - 5° C | + 40 °C | 5 | 95 | 1 | 29 | Normal |
| AB5 | + 5 °C | + 40 °C | 5 | 85 | 1 | 25 | Normal |
| AB6 | + 5 °C | + 60 °C | 10 | 100 | 1 | 35 | Appropriate arrangements shall be made |
| AB7 | - 25 °C | + 55 °C | 10 | 100 | 0.5 | 29 | |
| AB8 | - 50 °C | + 40 | 15 | 100 | 0.04 | 36 | |
| AC | Altitude | ||||||
| AC1 | ≤ 2000 m | Normal | |||||
| AC2 | > 2000 m | May necessitate precaution (derating factors) | |||||
| AD | Presence of water | ||||||
| AD1 | Negligible | Probability of presence of water is negligible | IPX0 | ||||
| AD2 | Free falling drops | Probability of presence of water is negligible | IPX1 or IPX2 | ||||
| AD3 | Sprays | Possibility of water falling as a spray at an angle up to 60° from the vertical | IPX3 | ||||
| AD4 | Splashes | Possibility of splashes from any direction | IPX4 | ||||
| AD5 | Jets | Possibility of jets of water from any direction | IPX5 | ||||
| AD6 | Waves | Possibility of water waves (seashore locations) | IPX6 | ||||
| AD7 | Immersion | Possibility of intermittent partial or total covering by water | IPX7 | ||||
| AD8 | Submersion | Equipment is permanently and totally covered | IPX8 | ||||
| AE | Presence of foreign solid bodies or dust | ||||||
| Smallest dimension | Example | ||||||
| AE1 | Negligible | IP0X | |||||
| AE2 | Small objects | 2.5 mm | Tools | IP3X | |||
| AE3 | Very small objects | 1 mm | Wire | IP4X | |||
| AE4 | Light dust | IP5X if dust penetration is not harmful to functioning IP6X if dust should not penetrate | |||||
| AE5 | Moderate dust | ||||||
| AE6 | Heavy dust | IP6X | |||||
| AF | Presence of corrosive or polluting substances | ||||||
| AF1 | Negligible | Normal | |||||
| AF2 | Atmospheric | According to the nature of the substance | |||||
| AF3 | Intermittent, accidental | Protection against corrosion | |||||
| AF4 | Continuous | Equipment specially designed | |||||
| AG | Mechanical shock | ||||||
| AG1 | Low severity | Normal, e.g. household and similar equipment | |||||
| AG2 | Medium severity | Standard industrial equipment, where applicable, or reinforced protection | |||||
| AG3 | High severity | Reinforced protection | |||||
| AH | Vibrations | ||||||
| AH1 | Low severity | Household or similar | Normal | ||||
| AH2 | Medium severity | Usual industrial conditions | Specially designed equipment or special arrangements | ||||
| AH3 | High severity | Severe industrial conditions | |||||
| AK | Presence of flora and/or moulds growth | ||||||
| AK1 | No hazard | Normal | |||||
| AK2 | Hazard | Special protection | |||||
| AL | Presence of fauna | ||||||
| AL1 | No hazard | Normal | |||||
| AL2 | Hazard | Special protection | |||||
| AM | Electromagnetic, electrostatic or ionising influences / Low frequency electromagnetic phenomena / Harmonics | ||||||
| AM1 | Harmonics, interharmonics | Refer to applicable IEC standards | |||||
| AM2 | Signalling voltage | ||||||
| AM3 | Voltage amplitude variations | ||||||
| AM4 | Voltage unbalance | ||||||
| AM5 | Power frequency variations | ||||||
| AM6 | Induced low-frequency voltages | ||||||
| AM7 | Direct current in a.c. networks | ||||||
| AM8 | Radiated magnetic fields | ||||||
| AM9 | Electric field | ||||||
| AM21 | Induced oscillatory voltages or currents | ||||||
| AM22 | Conducted unidirectional transients of the nanosecond time scale | ||||||
| AM23 | Conducted unidirectional transients of the microsecond to the millisecond time scale | ||||||
| AM24 | Conducted oscillatory transients | ||||||
| AM25 | Radiated high frequency phenomena | ||||||
| AM31 | Electrostatic discharges | ||||||
| AM41 | Ionisation | ||||||
| AN | Solar radiation | ||||||
| AN1 | Low | Normal | |||||
| AN2 | Medium | ||||||
| AN3 | High | ||||||
| AP | Seismic effect | ||||||
| AP1 | Negligible | Normal | |||||
| AP2 | Low severity | ||||||
| AP3 | Medium severity | ||||||
| AP4 | High severity | ||||||
| AQ | Lightning | ||||||
| AQ1 | Negligible | Normal | |||||
| AQ2 | Indirect exposure | ||||||
| AQ3 | Direct exposure | ||||||
| AR | Movement of air | ||||||
| AR1 | Low | Normal | |||||
| AR2 | Medium | ||||||
| AR3 | High | ||||||
| AS | Wind | ||||||
| AS1 | Low | Normal | |||||
| AS2 | Medium | ||||||
| AS3 | High | ||||||
| B - Utilization | |||||||
| BA | Capability of persons | ||||||
| BA1 | Ordinary | Normal | |||||
| BA2 | Children | ||||||
| BA3 | Handicapped | ||||||
| BA4 | Instructed | ||||||
| BA5 | Skilled | ||||||
| BB | Electrical resistance of human body (under consideration) | ||||||
| BC | Contact of persons with earth potential | ||||||
| BC1 | None | Class of equipment according to IEC61140 | |||||
| BC2 | Low | ||||||
| BC3 | Frequent | ||||||
| BC4 | Continuous | ||||||
| BD | Condition of evacuation in case of emergency | ||||||
| BD1 | Low density / easy exit | Normal | |||||
| BD2 | Low density / difficult exit | ||||||
| BD3 | High density / easy exit | ||||||
| BD4 | High density / difficult exit | ||||||
| BE | Nature of processed or stored materials | ||||||
| BE1 | No significant risks | Normal | |||||
| BE2 | Fire risks | ||||||
| BE3 | Explosion risks | ||||||
| BE4 | Contamination risks | ||||||
| C - Construction of building | |||||||
| CA | Construction materials | ||||||
| CA1 | Non combustible | Normal | |||||
| CA2 | Combustible | ||||||
| CB | Building design | ||||||
| CB1 | Negligible risks | Normal | |||||
| CB2 | Propagation of fire | ||||||
| CB3 | Movement | ||||||
| CB4 | Flexible or unstable | ||||||
