NEN 1010 §433
Overcurrent protection
Overstroombeveiliging
Also known as: groepzekering, groepszekering, home-battery, overstroom, overcurrent, overcurrent-protection, kortsluitbeveiliging, 431, verlengsnoer, stekkerdoos, stekkerdozen, contactdozen, power-strip, extension-cord, artikel-431, nen-1010-431, thuisbatterij, bess
Overcurrent protection: combination of overload (thermal) and short-circuit (magnetic) protection. Set to cable allowable current Iz — In ≤ Iz and I2 ≤ 1.45 Iz.
Practical example
Overcurrent protection. For a cable with Iz of 25 A, a 20 A MCB is used, satisfying In ≤ Iz and I2 ≤ 1.45 Iz.
Common mistake
Overcurrent protection. Common mistake: Choosing a breaker slightly above cable rating 'to prevent tripping' — thus voiding the cable's overload protection.
See also
Related terms
- Miniature Circuit Breaker (MCB)
- Fuse
- Selectivity / discrimination
- Tripping curve B / C / D
- Breaking capacity
- Fire-Protection RCD (300 mA)
- Equipotential bonding
- Initial verification / commissioning inspection
- Overvoltage category I-IV (CAT I-IV)
- Isolation transformer (electrical separation)
- Escape route lighting / emergency lighting
In-depth guides
- → §433 Overload protection (§433) — the coordination rule Ib ≤ In ≤ Iz and I₂ ≤ 1.45 Iz
- → §443 Surge Protection (SPD)
- → IEC 62619 / IEC 62477-1 BESS — DC side: overcurrent protection and cable sizing for battery energy storage systems
- → §559 Assimilation lighting — groups, RCD type and protection
- → NEN-EN-IEC 62305 Lightning protection for greenhouse complexes — risk
- → §434 Short-circuit protection & the adiabatic equation — §434
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