Introduction to Electrical Engineering

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1 Concise list external influences according IEC 364-3 A AA AA1 AA2 AA3 AA4 AA5 AA6 AB AC AC1 AC2 AD AD1 AD2 AD3 AD4 AD5 AD6 AD7 AD8 AE AE1 AE2 AE3 AE4 Ambient temperature -60°C +5°C -40°C +5°C -25°C +5°C -5°C +40°C +5°C +40°C +5°C 60°C Humidity Altitude ≤ 2000 m > 2000 m Water Negligible Drops Sprays Splashes Jets Waves Immersion Submersion Foreign bodies Negligible Small Very small Dust AF AF1 AF2 AF3 AF4 AG AG1 AG2 AG3 AH AH1 AH2 AH3 AJ AK AK1 AK2 AL AL1 AL2 Corrosion Negligible Atmospheric Intermittent Continuous Impact Low Medium High Vibration Low Medium High Other mechanical stresses Flora No hazard Hazard Fauna No hazard Hazard AM AM1 AM2 AM3 AM4 AM5 AM6 AN AN1 AN2 AP AP1 AP2 AP3 AP4 AQ AQ1 AQ2 AQ3 AR Radiation Negligible Stray currents Electromagnetic Ionization Electrostatics Induction Solar Negligible Significant Seismic Negligible Low Medium High Lightning Negligible Indirect Direct Wind B BA BA1 BA2 BA3 BA4 BA5 BB BC BC1 BC2 BC3 BC4 Capability Ordinary Children Handicapped Instructed Skilled Resistance Contact with earth None Low Frequent Continuous BD BD1 BD2 BD3 BD4 Evacuation (Low density/easy exit) (Low density/difficult exit) (High density/easy exit) (High density/difficult exit) BE BE1 BE2 BE3 BE4 Materials No risk Fire risk Explosion risk Contamination risk C CA CA1 CA2 Materials Non combustible Combustible CB CB1 CB2 CB3 CB4 Structure Negligible risk Fire propagation Structure movement Flexible .EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION 77 Table 8

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