November 16, 2018


Document Name: SAE J Automobile, Truck, Track-Tractor, Trailer, and Motor Coach Wiring CFR Section(s): 49 CFR Standards Body: Society of . Find the most up-to-date version of SAE J at Engineering Electrical wiring shall be installed and maintained to conform to SAE J – Automobile, Truck, Truck-Tractor, Trailer, and Motor Coach Wiring, October , .

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The elongation after aging shall be at least: Items that dictate the design are: Wiring shall be protected from stones, excess dirt, ice, moisture, chafing, and so forth, that will result in harmful effects.

Temperature rise tests of the conductor bundle shall be run to determine the proper conductor size and insulation. Insulated or nonconductive supports shall be used. Resistance wire low tension cable may be used to limit the voltage applied to electrical devices. Bunched or concentric will suffice in most applications, except those requiring higher flex life.

Avoid areas of excessive heat, vibration, arid abrasion. Motor Coach Section 6.

49 CFR 393.28 – Wiring systems.

Non- cycling type circuit breakers will not reset until the overload is removed, unless they are the non-cycling manual-reset type. Circuit Termination— Wiring for trailer circuits shall terminate in: Whatever coding system is chosen, the system shall facilitate in harness manufac- turing and in service. NOTE— Overlay or option wiring should be routed in the same fasteners with standard wiring where practical, or should be fastened to the standard wiring with plastic straps or other mechanical means.


Suitable tubing or conduit over cables may be substituted for grommets if properly secured. NOTE — In many cases 4 or 6 gauge may be required.

Headlight systems shall be independently pro- tected. The splice must be insulated. Ground return connections shall be made to the vehicle structure, frame, or engine.

Wiring connections to lights mounted on the coach body shall be accessible from outside, with the light removed or through an access door in an interior trim panel. Storage Battery Cables 7. In addition, the maximum continuous duty temperature rating for any wire insulation shall be determined by an accelerated aging test conducted in accor- dance with ASTM Dwith the samples of insulation being removed from the finished wire and aged h.

Circuits using resistance wire shall be carefully placed in the vehicle so that their temperature rise will not create a hazard to, or malfunction of, any part of the vehicle. Consideration is given to physical and environmental factors such as flex- ing, heat, cold, bend, oil and fuel contact, dielectric, abrasion, short circuit, and pinch resistance among others.

49 CFR – Wiring systems. | US Law | LII / Legal Information Institute

The ground wire for insulated-return systems shall be equal to the respective feed wire. Heavier conductors may be required to protect the carrying of current in wire bundles when all conductors are carrying maximum current.

All conductors are to be constructed in accordance with SAE Jl and J except when good engineering practice dictates special strand con- structions. All wiring for legally required lights shall be serviceable in a manner permitting removal and reinstallation from outside the trailer.


For larger cable sizes, rope stranding is needed for routing purposes as well. Extreme care shall be h1292 by the design engineer in choosing resistance wire as a conducting material to satisfy the current demand of the device and not create a temperature rise in the conductor that would deteriorate the insulating material even though the device is left on continuously.

Full text of “SAE J Automobile, Truck, Truck-Tractor, Trailer, and Motor Coach Wiring”

Extra protection such as loom, conduit, tubing, heat shield, etc. The main ground wire shall be a minimum of gauge. It covers the areas of performance, operating integrity, efficiency, economy, uniformity, facility of manufacturing and service.

NOTE — Extra protection such as braid, loom, conduit, etc. This practice applies to wiring systems of less than 50 V. A ser- rated paint cutting terminal may be utilized to make proper contact on painted surfaces.

Wiring not subject to damage from scuffing or scrubbingon rough metal-edges. Secondary applications will dictate the use of special terminations for special use or application. A general design guide would be that the conductor will be required to dissipate no more than 5 W per u1292 conductor foot. Suitable conduit and boxes, b. Spe- cial applications without irisulation grips may be employed where other means of retieving-strairi are provided;- 3.