Telecom Cable-UL-communication-cable

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GuangDong RiFeng Electric cable co.,ltd

GuangFeng Industrial Zone, West District, ZhongShan City, GuangDong

18938799067

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Telecom Cable-UL-communication-cable


company	GuangDong RiFeng Electric cable co.,ltd
Categories	LED Displays
Update	2010-12-30
Original Region	China
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Telecom Cable-UL-communication-cable

Explain:

Standard: UL 444-2002
Specification:
TABLES

Table 1
Maximum temperature rating of cables relative to diameter and coating of the solid copper conductor or of each copper conductor strand
(See Clause 4.1.1)

Metal coating	Diameter
Metal coating	Smaller than 0.38 mm(0.015in)	At least 0.38 mm(0.015 in)
Uncoated,tin or tin/lead alloy coating	150℃	200℃
Silver coating	200℃	200℃
Nickel coating	over 200℃	over 200℃

Table2
Maximum direct current resistance of copper conductors in ohms per km
(See Clauses 4.1.4 and 6.16.3, and 7.3.2)

Conductor size(AWG)	Stranded conductor				Solic conductor
	Uncoated		Coated		Uncoated		Coated
	20℃	25℃	20℃	25℃	20℃	25℃	20℃	25℃
30	354	361	371	377	374	384	390	397
29	277	282	288	294	293	299	305	311
28	223	227	232	236	236	240	245	250
27	175	179	182	186	185	189	193	197
26	140	143	145	148	148	151	154	157
25	111	113	115	117	117	119	121	124
24	87.6	89.2	90.9	93.2	93.8	95.8	103	105
23	69.2	70.5	71.9	73.2	73.2	74.5	76.1	77.8
22	55.4	56.4	57.4	58.7	59.1	60.4	65.0	66.3
21	43.6	44.6	45.6	46.3	46.3	47.2	48.2	49.2
20	34.4	35.1	35.8	36.4	36.4	37.1	38.1	38.7
19	27.5	28.4	28.6	29.1	29.1	29.7	30.2	30.8
18	21.9	22.3	22.7

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