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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All wiring for legally required lights shall be serviceable in a manner permitting removal and reinstallation sar outside the trailer. Since the nature of the wire is to limit the m1292 applied to electrical devices, the distance of the device from the power source and the cur- rent demand of the device will determine the materials used. Heavier conductors may be required to protect the carrying of current in wire bundles when all conductors are carrying maximum current. Ground return connections shall be made to the vehicle structure, frame, or engine.
The splice must be insulated.
Ground terminal devices shall be eadmium,. Search the history of over billion web pages on the Internet. Ground terminals shall be accessible for service: 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.
A multitude of dif- 7. Unless otherwise indicated, the latest version of SAE publications shall apply.
This practice applies to wiring systems of less than 50 V. Bunched or concentric will suffice in most applications, except those requiring higher flex life. Care shall be taken to riiiriimize wicking’of solder ma stranded wire to avoid impairment of the strain relief oi: Structure of the trailer, and c. It is desirable to identify, resistance wire by printing the words resistance wire on the conductor.
Truck, Truck-tractor Section 4. This is written principally for new vehicles but is also applicable to rewiring and service.
Secondary applications will dictate the use of special terminations for special use or application. Clips also assist in locating and routing at assembly. Where impractical, the coding is to be followed to a junction block or harness ter- minating point where visual inspection will identify the circuit coding change.
The ground wire for insulated-return systems shall be equal to the xae feed wire. Motor Coach Section 6. Battery strap is available The elongation after aging shall be at least: 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.
49 CFR 393.28 – Wiring systems.
Resistance wire low tension cable may be used to limit the voltage applied to electrical devices. In cases where the engine or body is mounted on rubber or other insula- tion, proper ground saf be provided.
Circuit protection sa be accomplished by dae fuses, circuit break- ers, or fusible links which conform to SAE Standards. A jumper cable with cable plug conforming ase SAE J Wiring not subject to damage from scuffing or scrubbingon rough metal-edges.
Suitable conduit and boxes, b. Wiring exposed to such conditions shall be further protected by either, or a combination of, the use of heavy wall thermoplastic insu- lated cable, see SAE Standard J, Low Tension Primary Cable additional tape application, plastic sleeving or conduit, nonmetallic loom, or metallic or other suitable shielding or covering.
Wiring shall be protected from stones, excess dirt, ice, moisture, chafing, and so forth, that will result in harmful effects. A cable of this type is generally used in static non-flexing applications when nominal abrasion, heat, cold, oil, dielectric, short circuit, and pinch resistance properties are desired.
Headlight systems shall be independently pro- tected. Devices, lamps, and so forth requiring ; peri- odic service shall be serviceable arid accessible by providing’ wife length suffi- cient to reasonably accomplish this.
49 CFR – Wiring systems. | US Law | LII / Legal Information Institute
Storage Battery Cables 7. 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. 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. Avoid areas of excessive heat, vibration, arid abrasion.
Polyvinyl chloride PVC can sqe used in most applica- are sleeves and covers which provide additional circuit and corrosion protection, tions; cross-linked polyethylene, hypalonj neoprene; etc.
NOTE — In many cases 4 or 6 gauge may be required. Preferably, the marking shall be in amber reflective letters. Full text of ” SAE J NOTE — Extra protection such as braid, loom, conduit, etc. Left rear stop and turn Yellow. NOTE— Contact of the trailer king pin or apron plate with the lower coupler or grounding through the coupler is not to be considered as providing a tractor-to-trailer ground.
A ser- rated paint cutting terminal may be utilized to make proper contact on painted surfaces. Non- cycling type circuit breakers will not reset until the overload is removed, unless they are the non-cycling manual-reset type. Also available protection for the core. It is further desirable for all motor vehicle manufacturers to assign and use similar color code information for commonly used electrical circuits to promote ease of circuit analysis in service among the various manufacturers.
Items that dictate the design are: