What is the radiation of the laser scanning scanner?
PVC pipe workers save the material, but the protection of strength is weak, such as in the wall nail hole, it may damage the wire, pay attention to choose flame retardant tube, turn not to death. Metal tube high strength, a shielding effect, but also doubles as ground lead, but the construction process more stress.
Usually with PVC pipe; very few people with galvanized pipe. Galvanized pipe buried wall helps to heat, not easy to fire. Lighting socket PVC generally with four sub-tube, threading with more than 6 minutes, more with two tubes. There is also a single line through the tube, safer.
According to the electrical procedures for the way! Built-in, the default threading battalions using metal snakeskin hose! But the domestic tube of these! Most of the PCV tube or even low-quality soft plastic snake hose! This is the hidden trouble of the circuit! There is no way! National conditions so much! Home wall and top embedded tube with PCV! Lighting and socket with three tubes (20mm)! Dry line and air conditioning line can be used 1 inch tube (25 mm) galvanized pipe for wall, buried, outside the wall!
