Historical textIn force on Oct. 1, 2001Source: annual CFR editions 1996–2004

§ 393.31 Overload protective devices.

Wording first on file in the 1996 annual edition, superseded by the 2005 annual edition. The section was then removed.

govinfo, 2001 edition ↗

Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2001 edition's wording. An amendment that took effect between Oct. 1, 2001 and Oct. 1, 2001 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.

49 CFR § 393.31 — Overload protective devices.. Text in force on October 1, 2001. This wording effective October 1, 1996 to October 1, 2005. Source: govinfo, 2001 edition, https://www.govinfo.gov/app/details/CFR-2001-title49-vol4/CFR-2001-title49-vol4-sec393-31. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.31?asof=2001-10-01, on October 26, 2026. Unofficial compilation; verify against the official source.

(a) The current to all low tension circuits shall pass through overload protective devices except that this requirement shall not be applicable to battery-to-starting motor or battery-to-generator circuits, ignition and engine control circuits, horn circuits, electrically-operated fuel pump circuits, or electric brake circuits.

(b) Trucks, truck-tractors, and buses meeting the definition of a commercial motor vehicle and manufactured after June 30, 1953 shall have protective devices for electrical circuits arranged so that:

(1) The headlamp circuit or circuits shall not be affected by a short circuit in any other lighting circuits on the motor vehicle; or

(2) The protective device shall be an automatic reset overload circuit breaker if the headlight circuit is protected in common with other circuits.

[33 FR 19735, Dec. 25, 1968, as amended at 53 FR 49397, Dec. 7, 1988]

Amendment history

1 distinct wording on file since Oct. 1, 1996

Oct. 1, 1996 → Oct. 1, 2005annual editions 1996–2004viewing
[33 FR 19735, Dec. 25, 1968, as amended at 53 FR 49397, Dec. 7, 1988]

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.