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Reading the regulations as they stood on October 1, 2007. Current text may differ.Switch to current
Current textIn force on Oct. 1, 2007Source: annual CFR editions 2005–2016

§ 393.28 Wiring systems.

Current wording, in the annual edition revised as of Oct. 1, 2005.

govinfo, 2007 edition ↗
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2007 edition's wording. An amendment that took effect between Oct. 1, 2007 and Oct. 1, 2007 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.
49 CFR § 393.28 — Wiring systems.. Text in force on October 1, 2007. This wording effective October 1, 2005 to present. Source: govinfo, 2007 edition, https://www.govinfo.gov/app/details/CFR-2007-title49-vol5/CFR-2007-title49-vol5-sec393-28. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.28?asof=2007-10-01, on October 26, 2026. Unofficial compilation; verify against the official source.

Electrical wiring shall be installed and maintained to conform to SAE J1292—Automobile, Truck, Truck-Tractor, Trailer, and Motor Coach Wiring, October 1981, except the jumper cable plug and receptacle need not conform to SAE J560. The reference to SAE J1292 shall not be construed to require circuit protection on trailers. (See § 393.7(b) for information on the incorporation by reference and availability of this document.)

[70 FR 48047, Aug. 15, 2005]

Amendment history

2 distinct wordings on file since Oct. 1, 1996
  1. Oct. 1, 2005 → presentannual editions 2005–2016diff vs. previousviewing
    [70 FR 48047, Aug. 15, 2005]
  2. Oct. 1, 1996 → Oct. 1, 2005annual editions 1996–2004
    [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.