StacksVerified U.S. regulatory reference

33 CFR §183.435

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Each conductor in a circuit that has a nominal voltage of 50 volts or more must be:
    1. (1)A conductor that has insulation listed and classified moisture resistant and flame retardant in Article 310, NFPA No. 70, National Electric Code;
    2. (2)A flexible cord type SO, STO, ST, SJO, SJT, or SJTO listed in Article 400, NFPA No. 70, National Electric Code;
    3. (3)A conductor that meets IEEE Standard 45.
    4. (4)A conductor that meets UL Standard 1426.
  2. (b)Where the nominal circuit voltage of each of three or more current carrying conductors in a duct, bundle, or cable is 50 volts or more, the amperages of each of those conductors must not exceed the value in table 5 multiplied by the correction factor in note 2 to Table 5 for the number of conductors that carry 50 volts or more.
  3. (c)This section does not apply to communication systems; electronic navigation equipment; resistance conductors that control circuit amperage; conductors in secondary circuits of ignition systems; and pigtails of less than seven inches of exposed length.