保护管直线长度超过30m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.
保护管直线长度超过30m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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