Three parallel insulation copper wires form power generatrix. Electric heating threads are wound around the inner jacket insulation layer ln every certain distance, the heating thread is welded in turn to the three power generatrix circularly. This makes every 2 phases into acontinuous parallel connection resistance. When the generatrix is connected to 3 -phase power supply, the every parallel resistance heats at the same time This makes a continuous heating belt.
（2）產品規格和主要技術特性
Product Types and Main Technical Characteristics
表 2-2： JFB-口/3型電熱帶主要技術參數表
Table 2-2: Main Technical Parameters of JFB- 口 /3 Type Electric heat cable
型號
Type
額定 電壓
Rated Voltage
（v）
額定 功率
Rated Power
（w/m）
絕緣 電阻
Insulation Resistance
（MΩ /hm）
電氣 強度
Electricity Intensity
（v/min）
絕緣層 材料
Insulation Material
產品 zui高 耐溫
Highest Temp- erature
（℃）
防爆 標志
Explo- sion Proof Label
zui小彎 曲半徑
Min. Bending Radius
（mm）
介質zui 高維持 溫度
Highest Maintenance Temperature of Media
（℃）
單電源 zui大使 用長度
Max. UseLength of Single Power
（m）
加強型
Reinforced
JFB-30/3J
380
30
≥50
2750
F46
200
ExeIIT4
普通型
Common
30 加強型
Reinforced
35
120
320
JFB-40/3J
40
100
240
JFB-50/3J
50
80
190
JFB-60/3J
60
60
160
（3）產品特點及應用場合
Product Characteristics and Applications
三相電熱帶除有單相電熱帶相同特點外，還有以下優點：
Besides the above characteristics the three phase heating cables have following advantages:
①率的三相電熱帶的zui大允許使用長度是單相電熱帶的三倍。
The most tolerable length of the three-phase heat cable is three times longer than the length of the single-phase heating cable of the same wattage.
②三相帶截面大，傳熱導面積大，能提高傳輸效率。
Bigger section area of three phase heating cable can broaden heat transmitting area and thisincreases the transmitting efficiency.
三相并聯帶一般適用于大管徑，管網系統管線和罐體的伴熱保溫。
Three phase parallel connection heating cables are suitable forthethermal insulation of pipes with big diameters, pipe lines in nets and tanks.
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