Jan. 06, 2022
Electrical Flexible Conduit often encounters a variety of
problems during the construction process. The most common problem is the
excessive resistance encountered during threading. In fact, there are many ways
to solve this situation. In the early stage of construction, We can prevent this
from happening as long as we do a good job. Let me introduce the specific
reasons and solutions.
Electrical Flexible Conduit
The joints of flexible electrical conduits need to be tightened before
construction and the tightening method is also required. First, unscrew the
fastening nut of the connection joint and place it on the inner wall of the box
(box), and then tighten the connection joint with a wrench Just the nut.
Protective measures such as adding protective tubes should be taken when the
foundation of the building or when it may be exposed to significant mechanical
impulse. Compensation devices should be installed when passing through
settlement joints or expansion joints. Flexible electrical conduits should be
neatly arranged and firmly fixed when exposed, and the spacing between their
fixing points should be uniform. The distance between the tube clamp and the
terminal, the midpoint of the turn, the edge of the electrical appliance or
equipment is 150mm ~ 300mm, and the fixed tube clamp in the middle of the
pipeline The large distance is 0.5 ~ 1m, and the distance between fixed points
should be uniform, and the allowable deviation should not be greater than 30mm.
The allowable deviation of the horizontality or verticality of the exposed
flexible metal wire protection sleeve laid horizontally or vertically is 5%, and
the deviation of the total length should not be more than 1/2 of the inner
diameter of the pipe. When the flexible metal wire protective sleeve is
concealed, it should be laid along the near route, and the bending should be
reduced. The small distance between the metal sleeve buried in the building and
the building surface should not be less than 15mm; laying in the cast-in-situ
concrete It should be fixed with steel bars when the distance is not more than
500mm. When the flexible metal wire protection sleeve is routed after piping,
the total cross-sectional area of the conductor in the pipe including the
insulating layer should not be greater than 40% of the empty cross-sectional
area of the pipe. When the flexible metal wire is used to protect the sleeve
or the bend is long, to prevent damage to the wire due to excessive resistance
when the Priica pipe is threaded, the distance between the two junction boxes or
the cable box is specified: no more than 30m when there is no bend; When there
is one bend, it does not exceed 20m; when there are two bends, it does not
exceed 15m; when there are three bends, it does not exceed 8m.
Windable metal tube can absorb vibration, it can not only improve the
system's ability to fatigue damage, but also can achieve the effect of reducing
noise. This is why some piping systems use Flexible Metal
Conduit.
After the metal reacts with oxygen in the atmosphere, an oxide film is formed
on the surface. The iron oxide formed on ordinary carbon steel continues to
oxidize, causing the corrosion to continue to expand
Large, eventually forming holes. Carbon steel surfaces can be electroplated
with paint or oxidation-resistant metals (for example, zinc, nickel, and
chromium).
As is known, this protection is only a film. If the protective layer is
broken, the underlying steel begins to rust.
We are Electrical Flexible Conduit Factory, welcome to
consult.
