Why, in general, the strong tube is plastic tubes, weak tubes are metal tubes?
Weak metal pipe is mainly anti-interference, shielding role. Strong PVC is because the cost material cost and construction low construction speed, simple process, smooth inner wall wear line resistance is small but low strength, in more than 40 pipes generally required chroma metal tube or galvanized metal tube special.
Strong electricity with plastic pipe is to prevent leakage in the insulation role, such as using metal tube will be connected to the ground, weak electricity is the leakage of electricity, will not be dangerous
The metal tube can be grounded to shield, eliminate interference, and reduce the electromagnetic interference between the weak current
