Flexible Fire-Resistant Cable

This standard is primarily based on GB/T 12706.1-2020, "Power Cables with Extruded Insulation and Their Accessories Rated from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV) — Part 1: Cables Rated 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV)," as well as GB/T 19666-2019, "General Rules for Flame-Retardant and Fire-Resistant Wires and Cables." This product is designed for use in critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, nuclear power plants, steel mills, and shipbuilding facilities; advanced and essential public infrastructure like satellite ground stations, railway wiring systems, alarm and fire protection systems; and environments where safeguarding human life and property is paramount—such as historic buildings, hotels, high-rise structures, museums, libraries, banks, hospitals, insurance institutions, shopping malls, and research facilities.

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Fire-resistant cable

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Product Description

This standard is primarily based on GB/T 12706.1-2020, "Power Cables with Extruded Insulation and Their Accessories for Rated Voltages from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV)—Part 1: Cables Rated at 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV)," as well as GB/T 19666-2019, "General Specifications for Flame-Retardant and Fire-Resistant Wires and Cables." This product is designed for use in critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, nuclear power plants, steel mills, and shipyards; advanced and essential public facilities like satellite ground stations, railway wiring systems, alarm systems, and fire protection networks; and environments where safeguarding human life and property is paramount—such as historic buildings, hotels, high-rise structures, museums, libraries, banks, hospitals, insurance institutions, shopping malls, and research facilities.

Product Models and Naming

Model	Name
YTTW	Copper-core, embossed copper-sheathed, inorganic mineral-insulated flexible fire-resistant cable
YTTWV	Copper-core, embossed copper-sheathed, inorganic mineral-insulated, PVC-sheathed flexible fire-resistant cable
YTTWY	Copper-core, embossed copper-sheathed, inorganic mineral-insulated, polyolefin-based, corrosion-resistant, flexible fireproof cable with an external protective jacket.

Product Specifications

Model	Rated Voltage	Number of cores	Nominal Cross-Sectional Area / mm²
YTTW YTTWV YTTWY	450/750V 0.6/1kV	1	1.0 to 630
		2	1.0 to 300
		3	1.0 to 240
		4	1.0–185
		3 + 1	3 × 16 + 1 × 10
			3 × 25 + 1 × 16
			3 × 35 + 1 × 16
			3 × 50 + 1 × 25
			3 × 70 + 1 × 35
			3 × 95 + 1 × 50
			3 × 120 + 1 × 70
			3 × 150 + 1 × 70
			3 × 185 + 1 × 95
			3 × 240 + 1 × 120
		3 + 2	3 × 25 + 2 × 16
			3 × 35 + 2 × 16
			3 × 50 + 2 × 25
			3 × 70 + 2 × 35
		4+1	4×16 + 1×10
			4 × 25 + 1 × 16
			4 × 35 + 1 × 16
			4 × 50 + 1 × 25
			4 × 70 + 1 × 35
		5-7	1.0 to 4.0
		12-37	1.0–2.5

Nominal thickness of the copper sheath

Nominal cross-section / mm²	Nominal thickness of copper sheath / mm
Nominal cross-section / mm²	1-core	2-core	3-core	4-core	5-core	7-core	12-core	19-core	24-core	30-core	37-core
1.0	0.4	0.4	0.4	0.4	0.45	0.45	0.4	0.4	0.4	0.4	0.4
1.5	0.4	0.4	0.4	0.4	0.45	0.45	0.4	0.4	0.4	0.4	0.4
2.5	0.4	0.4	0.4	0.4	0.45	0.45	0.4	0.4	0.4	0.4	0.4
4	0.4	0.4	0.4	0.4	0.45	0.45	/	/	/	/	/
6	0.4	0.4	0.4	0.4	0.45	0.45	/	/	/	/	/
10	0.4	0.45	0.45	0.45	0.5	0.5	/	/	/	/	/
16	0.4	0.45	0.45	0.5	0.5	/	/	/	/	/	/
25	0.4	0.5	0.5	0.5	0.5	/	/	/	/	/	/
35	0.45	0.5	0.5	0.5	0.5	/	/	/	/	/	/
50	0.5	0.5	0.5	0.6	0.6	/	/	/	/	/	/
70	0.5	0.5	0.6	0.6	0.6	/	/	/	/	/	/
95	0.5	0.5	0.6	0.6	0.6	/	/	/	/	/	/
120	0.5	0.5	0.6	0.6	0.6	/	/	/	/	/	/
150	0.5	0.6	0.6	0.7	0.7	/	/	/	/	/	/
185	0.5	0.6	0.6	0.7	0.7	/	/	/	/	/	/
240	0.6	0.6	0.6	0.7	0.7	/	/	/	/	/	/
300	0.6	/	/	/	/	/	/	/	/	/	/
400	0.6	/	/	/	/	/	/	/	/	/	/
500	0.6	/	/	/	/	/	/	/	/	/	/
630	0.6	/	/	/	/	/	/	/	/	/	/
Note: For core counts not listed, the nominal thickness of the copper sheath should be set to the closest value specified for the corresponding core count.