Cable ties for electrical installations. Specifies requirements for metallic, non-metallic and composite cable ties and their associated fixing devices used for the management and support of wiring systems in electrical installations. Includes a 'Pull and Hold' method for testing the loop tensile strength of cable ties both metallic and non-metallic types.
It covers the connector type where the male tab has a hole or dimple detent and is fitted to a female connector. This standard establishes a test method to determine the axial tensile load that can be applied to a mated pair of connectors. It covers the holding effect of a connector cable clamp without causing any detrimental effects upon the cable or connector when subjected to inadvertent axial tensile loads.
A 'Pull and Hold' test is prescribed where the pull force is applied to the connector at a loading-rate 89 newtons per minute up to a specified level and then held for 1 hour, whilst electrical continuity at mA is measured. USCAR automotive applications. USCAR US Council for Automotive Research standard 21 - includes pull testing for validation of solderless crimped connections used with stranded automotive copper wire.
VW Volkswagen Crimp connectors. This automotive company standard relates to solderless crimp connectors using crimp barrels and conductors made of flexible copper and applies only to single cable crimps.
Sections 5. It relates to solderless crimp connectors using crimp barrels and conductors made of flexible copper. Section PG10 covers the 'conductor pull-out strength' test method. BS 5G Part 1 : Crimped joints for aircraft electrical cables and wires. Provides test requirements for the crimping of insulated and non-insulated terminals and splices to general purpose electrical cables, or equipment wires for aircraft, with conductors of copper, copper alloy, aluminium or aluminium alloy.
ISO : Crimped joints for aircraft electrical cables. Describes the design requirements and tests for the crimping of insulated and non-insulated terminations to general purpose cables, with conductors of copper, copper alloy, aluminium or aluminium alloy. This standard sets out requirements for measuring the integrity of crimped connections for interconnecting cable and harness assemblies.
If you decide against the use of cookies, we will not use cookies nor similar technologies, except those that are essential for the proper functioning of the website. Click here for our privacy policy. Accept Cookies Cookie Settings. Contact Us. Email: info checkline. Your information request is sent! If the device had an accuracy of 0. Therefore, wire harness manufacturers that must comply to USCAR will either need pull test devices with extreme accuracy or they will need many devices for a complete range of wires.
Aside from simple mistakes made during the harness manufacturing process, terminals can go out of tolerance in the manufacturing process and frequently companies need to use terminals that are too large for the wire. The wire used is a 26 AWG and the crimp height and width is as specified by the manufacturer. The air gaps inside the crimp clearly indicate that the terminal is too big for the wire. USCAR recognizes that not all wires are the same.
Because of issues such as this and the persistence of crimp quality problems, more and more companies, like VW in Europe and China, are integrating crimp cross section analysis into their production processes. Micrograph systems, or crimp cross sectioning equipment, were typically only seen where applicator tooling was manufactured or in the labs of the large wire harness suppliers. They were large table units involving epoxies and acidic etching solutions. On the other hand, this type of equipment is the only way to get a clear picture of the inside of the crimp Fig 5.
New systems on the market are much more suited for use in the production process because the crimp analysis process is much faster since there are fewer steps.
Most systems use an electrolytic staining process rather than acid etching. Acids require special training, gloves and eye protection as well as special procurement and waste processes, since acids are considered to be hazardous materials.
The solutions in the new systems have a Ph value equal to that of water so they are much safer to use and no special procurement and waste processes are required.
Finally, the new systems are far less expensive. Therefore, getting a comprehensive analysis on the entire crimp is faster, easier and less expensive. The VW specification mandates their use depending on wire size. More issues are seen in smaller wire sizes, so testing frequency is higher. The table below indicates the frequency requirements as stated in the VW specification.
The crimp height 1 is the standard measurement. The crimp width 2 or the non-measurable crimp width can only be measured using a micrograph. The measurable crimp width 3 is simply taken at the widest point of the terminal.
The support angle 4 and support height 5 are indications of how centered the terminal is in the crimp and how strong the crimp will be over time. The more vertical the angle is and the larger the height is the stronger the crimp will be over time. The face end clearance 6 is an indication if the terminal is properly sized to the wire.
If the terminal is too large, the face ends may touch or be too close to the bottom of the crimp. The distance between face ends 7 is also an indication of how centered the terminal is in the crimp.
Pull testing is actually a means of evaluating the mechanical properties of the crimped connections. A tensile strength or pull test actually means to hold a crimped connection steadily and apply a force to it. There are two methods to maintain a continuous force on a test sample. One way is to attach one end of the sample to a stationary point and the other end to a certified and calibrated weight of a precise required value.
The other way is to use a pull tester, which is a machine especially designed for this purpose. The more preferable of these two methods is the pull tester method.
Keeping in mind that each standard weight needs traceable calibration; that each gripper, hook and any other accessory add weight that might invalidate the calibration and in the case when a wire breaks, the weight will fall and might be damaged or, even worst, cause an injury, the weights method becomes not really practical. There are several types of pull testers. There are simple manual testers which are suitable for in-house testing and require special handling by the operator in order to produce reliable results.
On the other hand, there are motorized pull testers which are more reliable and have many more capabilities than the manual ones.
0コメント