The best replacement for iec is nema.

The best alternatives to iec are rated as following:
★★★★★  nema
★★★  ul
★★★  en
★★  nec
★★  ansi
★★  ibew
★  atex
★  nema motors
★  nema motor
★  ieee
★  nema enclosure
★  ul standards
★  jic
★  nab
  en standards
  iecex
  doe
  doe washer capacity
  nema standards
  nec area classification
  aha
  cenelec
  bs
  irb
  eff

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