伴热电缆的交叉：在易燃易爆场合必须采用配套的防爆直线型接线盒，一般场合也可以采用绞接或焊接。
Heating cable cross: must be used in explosive situations linear supporting proof junction box, the general situation can also be used splice or welding.
保护管直线长度超过30 m时需加装接线盒，同一管线超过两个直角弯时应加设中间接线盒。
When the linear length of the protecting pipe is over 30m, the junction box should be added; and when there are more than 2 right-angle bends, junction box should be added between them.
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