---
kind: "section"
citation: "33 C.F.R. § 183.435"
title: "33"
number: "183.435"
heading: "Conductors in circuits of 50 volts or more."
url: "https://uscodex.org/cfr/33/183.435"
---

# §183.435. Conductors in circuits of 50 volts or more.

- (a) Each conductor in a circuit that has a nominal voltage of 50 volts or more must be:
  - (1) A conductor that has insulation listed and classified moisture resistant and flame retardant in Article 310, NFPA No. 70, National Electric Code;
  - (2) **A flexible cord type SO, STO, ST, SJO, SJT, or SJTO listed in Article 400, NFPA No.** 70, National Electric Code;
  - (3) **A conductor that meets IEEE Standard 45.**
  - (4) **A conductor that meets UL Standard 1426.**
- (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.
- (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.

## Notes

### Amendments

[CGD 73-217, 42 FR 5944, Jan. 31, 1977; 42 FR 24739, May 16, 1977, as amended by CGD 80-047 and CGD 80-046, 45 FR 85450, Dec. 29, 1980; CGD 87-009, 53 FR 36972, Sept. 23, 1988]

### Source

Source: CGD 73-217, 42 FR 5944, Jan. 31, 1977, unless otherwise noted.

### Authority

Authority: 46 U.S.C. 4302; Pub. L. 103-206, 107 Stat. 2439; and Department of Homeland Security Delegation No. 0170.1, para. II, (92)(b). Subpart E is also authorized by Pub. L. 114-120, 130 Stat. 27

### Source

Source: CGD 72-61R, 37 FR 15782, Aug. 4, 1972, unless otherwise noted.

### Amendments

[CGD 73-217, 42 FR 5944, Jan. 31, 1977; 42 FR 24739, May 16, 1977, as amended by CGD 80-047 and CGD 80-046, 45 FR 85450, Dec. 29, 1980; CGD 87-009, 53 FR 36972, Sept. 23, 1988]