布线时要用暗管敷设，导线在管内不应有接头和扭结。
When you use the wiring laying underground pipe, wire in the pipes should be joint and kink.
如可行，导线管敷设应采用适用于该应用的地方和国家电气规范。
When applicable, install conduit using local and national electrical codes that apply to the application.
如可行，导线管敷设应采用适用于该应用的地方和国家电气规范。
When applicable, install conduit using local and national electrical codes that apply to the application.
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