Flexible fire-resistant cable

This standard is primarily based on GB/T 12706.1-2020, “Extruded Insulated Power Cables and Accessories for Rated Voltages from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV)—Part 1: Cables for Rated Voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV),” as well as GB/T 19666-2019, “General Requirements for Flame‑Retardant and Fire‑Resistant Wires and Cables,” among other relevant standards. This product is intended for critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, (nuclear) power stations, steel mills, and shipbuilding facilities; advanced and essential public infrastructure, such as satellite earth stations, railway wiring systems, alarm systems, and fire‑protection systems; and environments where the safety of persons and property must be ensured, including historic buildings, hotels and guesthouses, high‑rise structures, museums, libraries, banks, hospitals, insurance institutions, shopping malls, and research institutes.

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Fire-resistant cable

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Product Description

This standard is primarily based on GB/T 12706.1-2020, “Extruded Insulated Power Cables and Accessories for Rated Voltages from 1 kV (Um = 1.2 kV) to 35 kV (Um = 40.5 kV)—Part 1: Cables for Rated Voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV),” as well as GB/T 19666-2019, “General Requirements for Flame‑Retardant and Fire‑Resistant Wires and Cables,” among other relevant standards. This product is intended for critical electrical engineering applications, including hazardous areas such as airports, oil depots, liquefied gas stations, chemical plants, coal mines, (nuclear) power stations, steel mills, and shipbuilding facilities; advanced and vital public infrastructure, such as satellite earth stations, railway wiring systems, alarm and fire‑protection systems; and environments where the safety of persons and property must be ensured, including historic buildings, hotels and guesthouses, high‑rise structures, museums, libraries, banks, hospitals, insurance institutions, shopping malls, and research institutes.

Product Model and Naming

Model number	Name
YTTW	Copper-conductor, corrugated copper‑sheathed, inorganic mineral‑insulated flexible fire‑resistant cable
YTTWV	Copper‑core, corrugated copper‑sheathed, inorganic mineral‑insulated, PVC‑sheathed flexible fire‑resistant cable
YTTWY	Copper‑core, corrugated copper‑sheathed, inorganic mineral‑insulated, polyolefin‑coated, corrosion‑resistant outer sheath, flexible fire‑resistant cable.

Product Specifications

Model number	Rated voltage	Number of cores	Nominal Cross-Sectional Area/mm²
YTTW YTTWV YTTWY	450/750V 0.6/1kV	1	1.0~630
		2	1.0~300
		3	1.0~240
		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	1.0~4.0
		12-37	1.0-2.5

Nominal thickness of the copper sheath

Nominal cross-sectional area/mm²	Nominal thickness of copper sheath / mm
Nominal cross-sectional area/mm²	1 core	2-core	3-core	4 cells	5-core	7-core	12-core	19-core	24 cores	30-pin	37 cores
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 conductor sizes not listed, the nominal thickness of the copper sheath shall be taken as the value closest to that specified for the corresponding conductor size.