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从工艺上分析耐火电缆的对火的耐受特性：Single core: A few users are mainly used to facilitate the maintenance of lines, such as more than two cores. When one core is burnt out, other cores are discarded at the same time. When the single core cable is burned out, only one core is replaced, so the maintenance and replacement is more economical.
Single core laying requires at least two parallel laying to form a transmission circuit.
电缆是怎么制造出来的，比如：左侧为各自类型耐火电缆，右侧为做对于的具体流程：
（ZR-）KVV
（ZR-）KVVR 铜(铝)材——拉丝(——绞合)——挤包绝缘——成缆+绕包——挤包护套
（ZR-）KVV22
（ZR-）KVV23 铜(铝)材—拉丝(—绞合)—挤包绝缘——成缆+绕包+钢带装铠——挤包护套
或—成缆+绕包—挤包内护套—钢带装铠—护套
（ZR-）KVV32
（ZR-）KVV33 铜(铝)材—拉丝(—绞合)—挤包绝缘—成缆+绕包—挤包内护套—钢丝装铠—挤包护套
Five-core cable is three fire lines, one neutral line and one grounding line. It is suitable for 380V and 220V lines. It realizes secondary grounding through neutral line and grounding line. It protects the line well and has high safety to life.
Four-core cables are suitable for 380V and 220V. Three-core cables are fire wires, the voltage between wires is 380V (called line voltage), and the fourth core is neutral line, which can be used for grounding.
NH—KVV
NH—KVVR 铜(铝)材—拉丝(——绞合)—绕包云母带——挤包绝缘——成缆+绕包——挤包护套
电缆是怎么制造出来的，比如：左侧为各自类型耐火电缆，右侧为做对于的具体流程：
Three-core cable is suitable for triangular connection of transmission and distribution lines, using a voltage of 380V, three-core are all fire lines.
Two-core cable can only be used in 220V line, that is, one core one ground.
NH-- KVV22
NH-- KVV23 铜(铝)材—拉丝(—绞合)—绕包云母带—挤包绝缘—成缆+绕包+装铠—护套
或—成缆+绕包—挤包内护套—钢带装铠—护套
电缆是怎么制造出来的，比如：左侧为各自类型耐火电缆，右侧为做对于的具体流程：
NH-- KVV32
NH--KVV33 铜(铝)材——拉丝(——绞合)——绕包云母带——挤包绝缘——成缆+绕包——挤包内护套——钢丝装铠——护套
电缆是怎么制造出来的，比如：左侧为各自类型耐火电缆，右侧为做对于的具体流程：
（ZR-）KVV（R）P
（ZR-）KVV（R）P2 铜(铝)材—拉丝(—绞合)——挤包绝缘——成缆+绕包——铜丝编织(铜带绕包)——挤包护套
（ZR-）KVV（R）P22
（ZR-）KVV（R）P2-22 铜(铝)材——拉丝(——绞合)——绕包云母带——挤包绝缘——成缆+绕包——铜丝编织(铜带绕包)——挤包内护套——钢丝装铠——挤包护套
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