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What type of extension cord is required for temporary wiring?

RegSenseSafety & HealthElectrical SafetyConstruction SafetyElectrical Safety Construction StandardsBest ResultsOccupational Safety and Health Administration (OSHA), DOLFAQEnglishFocus AreaUSA

OSHA says that extension cords must be rated for hard or extra-hard usage and must be three-wire. The regulations say at 1926.405(a)(2)(ii)(J):

  • Extension cord sets used with portable electric tools and appliances shall be of three-wire type and shall be designed for hard or extra-hard usage.
  • Flexible cords used with temporary and portable lights shall be designed for hard or extra-hard usage.

The National Electrical Code, ANSI/NFPA 70, in Article 400, Table 400-4, lists various types of flexible cords, some of which are noted as being designed for hard or extra-hard usage. Examples of these types of flexible cords include hard service cord (types S, ST, SO, STO) and junior hard service cord (types SJ, SJO, SJT, SJTO).

['Electrical Safety']
['Electrical Safety Construction Standards']
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