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2. Power frequency voltage test: AC 50HZ3.5KV/5min does not break down the IEC flame retardant rating In order to assess the merits of the flame-retardant performance of the cable, the International Electrotechnical Commission established three standards: IEC60332-1, IEC60332-2 and IEC60332-3. IEC60332-1 and IEC60332-2 are used to evaluate the flame retardant ability of single cable when it is tilted and placed vertically (nationally corresponding to GB12666.3 and GB12666.4). IEC 60332-3 (Chinese equivalent GB 12666.5-90, GB 12666.5 has been replaced by GB/T 18380.3-2001) is used to evaluate the flame retardant ability of bunched cables in vertical burning, compared to bunched cables in the vertical The burning requirements are much higher on the requirements of the flame retardancy.
â—Ž IEC60332-1/BS4066-1 Flame Retardant Rating (Single Wire or Cable Vertical Flame Test FlameTestOnSingleVerticalInsulatedWires/Cables) This is a flame retardant standard for a single cable. The test stipulated that a 60cm-long specimen was vertically fixed in a metal box opened in the front wall. The flaming length 175mm propane burner was brought into contact with the cable at a 45-degree angle from a position 450mm from the upper fixed end of the specimen. If the burned part of the specimen does not exceed 50mm from the lower part of the fixed end, the test passes.
◎ IEC60332-3/BS4066-3 flammability rating (bundle wire or cable vertical flame test FlameTestOnBunchedWires/Cables) This is a flame-retardant standard for bunched cables. The test stipulates that bundled 3.5m long cable specimens shall be fixed on a trapezoidal test stand with wire, and the number of specimens shall be determined according to the non-metallic materials required for different classifications. The sample is hung vertically on the back wall of the burner and air is introduced into the burner through the air inlet on the bottom plate. The propane surface burner is contacted with the sample with a 750°C flame. When the sample is forced to blow (air discharge 5m3/min, wind speed 0.9m/s), it must be burned within 20 minutes of vertical combustion, the cable spreads in the flame Within 2.5 meters self extinguishes. IEC60332 is divided into Class A, Class B, Class C and Class D to assess the flame retardant performance.
Any cable listed by UL Flame Retardance Standard UL has been tested and verified to comply with a certain fire rating. The cable may be printed with a UL identification number, a fire rating, and an approval number.
â—Ž Boost-CMP (PlenumFlameTest/SteinerTunnelTest) This is the most demanding Plenum Cable in the UL Fire Code. The applicable safety standard is UL910. The experiment specifies the horizontal wind on the device. A number of samples were placed on the track and burned for 20 minutes using an 87.9 KW gas Bunsen burner (300,000 BTU/Hr). The pass criteria is that the flame must not extend beyond 5 feet from the flame front of the Bunsen burner. The peak value of the optical density is 0.5 at maximum, and the maximum value of the average density is 0.15. This type of CMP cable is usually installed in the air return pressurization system used in ventilation ducts or air handling equipment and is approved by Canada and the United States. FEP/PLENUM materials that meet the UL910 standard have better flame retardancy than low-smoke halogen-free materials that comply with IEC60332-1 and IEC 60332-3 standards, and have low smoke concentrations.
â—Ž Trunk Level - CMR Grade (Riser Flame Test) This is a commercial grade cable (Riser Cable) in the UL standard. The applicable safety standard is UL1666. The experiment stipulates that a plurality of samples shall be laid on the simulated vertical shaft and the specified 154.5 KW gas Bunsen burner (527,500 BTU/Hr) shall be used for 30 minutes. The pass criteria is that the flame cannot spread to the upper part of a 12-foot-high room. The trunk level cable does not have a smoke concentration specification and is generally used for vertical and horizontal floor wiring.
â—ŽCommercial grade - CM grade (VertialTrayFlameTest) This is a commercial grade cable (GeneralPurseCable) in the UL standard. The applicable safety standard is UL1581. The experiment stipulated that a plurality of specimens should be laid on a vertical stand 8 feet high and burned (70,000 BTU/Hr) for 20 minutes with a prescribed 20KW band torch. The pass criteria is that the flame should not spread to the upper end of the cable and self-extinguish. UL1581 is similar to IEC60332-3C except that the number of installed cables is different. Commercial grade cables do not have smoke concentration specifications and are generally applied only to horizontal cabling on the same floor. They should not be used for vertical cabling on floors.
â—Ž General-class CMG (Vertial Tray Flame Test) This is a general-purpose cable in the UL standard (General Purpose Cable). The applicable safety standard is UL1581. Commercial-grade and general-purpose testing conditions are similar, and they are also approved for use in Canada and the United States. General-purpose cables do not have a smoke concentration specification and are generally applied only to horizontal cabling on the same floor. They should not be used for vertical cabling on floors.
â—Ž Home-class CMX (Vertial Wire Flame Test) This is the UL standard home-rated cable (Restricted Cable). The applicable safety standards are UL1581 and VW-1. The experiment stipulated that the sample was kept vertical and was burned (30,000 TU/Hr) for 15 seconds with the test burner, then stopped for 15 seconds and repeated 5 times. Passage criteria for the remaining flame can not exceed 60 seconds, the sample can not be burned more than 25%, the bottom of the surgical cotton can not be ignited by falling objects. UL1581-VW-1 is similar to IEC60332-1, except that the burning time is different. This grade also has no smoke or toxicity specifications and is used only in home or small office systems where a single cable is laid. This type of cable should not be laid in bundles and must be sleeved. Smoke density, halogen content and toxicity level
Analysis of Main Technical Specifications of Flame Retardant Cables
Flame retardant cable main technical indicators Finished cable conductor (R type) DC resistance (conforming to GB3956)