After many years of development of metal conduits, from ordinary steel pipes to PVC pipes, there are also sleeved and crimped steel conduits and sleeved and tightly fixed steel conduits.
The wiring system of a building is like a person's blood vessels and nerves. It is a very important and sensitive system. It is not to be used at all. The role of the metal conduit is to protect the normal operation of the circuit system. Poor quality metal conduits will not only not protect them but can also cause damage.