Issue link: https://te.mouser.com/i/1385324
mouser.com/te-connectivity 35 FIGURE 4: Oil barrier tube used in a 3-core paper cable joint. (TE Connectivity) FIGURE 5: Flame-retardant heat-shrink cable accessories in a vertical tray arrangement. (TE Connectivity) This function usually needs to be maintained for a service life of 40 years under maximum operating temperatures of the cable conductor in the range of 70°C. Heat-shrink materials with oil-blocking characteristics can also be used in the oil and gas or petrochemical industry applications, where oil- blocking features are required. Flame-Retardant Heat-Shrink Cable Accessories Specific environments such as railway, offshore applications, government buildings, or power- plant applications have requested flame-retardant cables and cable accessories requirements. Typical standards need to be met by cables. The standards are IEC-60332 and IEEE-1202 and usually only refer to cables. However, it has become common practice and industry- understanding to qualify cables with cable accessories to prove their suitability. During the IEEE-1202 test, the flame is applied to the cable or cable with accessory for 20 minutes. After this time, the flame will be removed, and the product characteristics need to assure that the flame will self-extinguish. The damaged area or flame propagation caused by this test shall be less than 1.5m (such as in a vertical tray application). The right material choice, which is usually combined with a particular wall thickness in the heat-shrink tube, will result in a flame-retardant heat-shrink tube. Shown is a typical arrangement where cables with flame-retardant heat-shrink tubes are subjected (Figure 5).