FLAMABILITY TESTS FOR ELECTRICAL CABLES

Transcription

1 Tests on electric and optical fibre cables under fire conditions Description E E acc. to IEC acc. to IEC Tests for flame Tests for flame propagation for a single insulated propagation for a single small insulated wire or cable - procedure for wire or cable - procedure for 1-kW pre-mixed flame diffusion flame 600 mm 600 mm acc. to IEC acc. to IEC kw flame defined by the stipulated setting of the flame length 45 to specimen 45 to specimen Duration of flame see table 1 20 seconds Cable must be self-extinguishing. Cable must be self-extinguishing. The damage or carbonization may The damage or carbonization may only reach max. 50 mm under the only reach max. 50 mm under the upper fixing clamp. upper fixing clamp. Table 1 outer diameter *) of specimen in mm in seconds D < D < D D > *) If cables or insulated cables are tested that are not round (e.g. flat twin cables) their dimensions is to be measured and an equivalent diameter must be calculated from this. 18

2 Examination of the flame length of extended bundle of wires and insulated cables Description IEC , E mm Flat burner (Ribbon gas burner of American Gas Furnace Co.) defined by stipulated flow of gas and air horizontal Category A, B: 40 minutes Category C, D: 20 minutes The burned portion of the sample must not be longer than 2.5 m measured from the bottom edge of the burner, as far as not otherwise specified in the relevant standards. E IEC Category A 7,0 l/m Category B 3,5 l/m Category C 1,5 l/m > 12 mm cable-ø Category D 0,5 l/m 12 mm cable-ø Volume percent of non metallic material per meter. max. width (acc. to testing methods) 19

3 Description UL 1581 section reference to standard UL 2556, section 9.4 (VW-1 Flame Test) 610 mm Bunsen burner with additional air supply (Tirril gas burner) ø 9.5 mm 500 W flame 20 to specimen 5 x 15 seconds with at least 15 seconds flaming break Paper max. 25% carbonized. The specimen may keep on burning for max. 1 minute after any application. Material dropping must not ignite the cotton (B) lying under the specimen. papier 12.5 x 20 mm mm 180 mm 610 mm length of specimen 254 mm 20 B 20

4 Description UL 1581 section 1061 (Cable Flame Test) 455 mm Bunsen burner with additional air supply (Tirril gas burner) ø 9.5 mm 500 W flame 20 to specimen 3 x 60 seconds with 30 seconds between each flaming Paper max. 25% carbonized. The specimen may keep on burning for max. 1 minute after the last application. Material dropping must not ignite the cotton (B) lying under the specimen. papier 10 x 20 mm mm mm 455 mm length of specimen 250 mm 20 B 21

5 Description UL 1581 section 1060 (Vertical Flame and FT1 Test) mm Bunsen burner with additional air supply (Tirril gas burner) ø 9.5 mm 500 W flame 20 to specimen 5 x 15 seconds with each 15 seconds flaming break Paper max. 25% carbonized. The specimen may keep on burning for max. 1 minute after the last application. papier 12.5 x 20 mm mm 180 mm 254 mm mm length of specimen 20 22

6 Description F C »C1«1600 mm +830 C ±50 C in the chimney Duration of test 30 minutes The outstanding cable above the chimney may not be damaged. ventilator 1600 mm min. 250 mm 800 mm 30 mm air air 23