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NFPAInstallationUSA

NFPA 70 (NEC)

National Electrical Code

The US wiring code. Its standard ampere ratings (240.6) and motor full-load current tables are widely used alongside IEC practice in Thailand.

What it covers

  • Standard ampere ratings of fuses and breakers (240.6)
  • Motor full-load current tables (430.248, 430.250)
  • Conductor ampacity (310)

Used in ElecCalcPro

Related standards

IEC 60364-4-43

This page summarises the document; it does not reproduce it. Obtain the current edition from the publisher for design and compliance work.