How to Select Flexible Metal Conduit for Industrial Cable Protection

Start with the cable route and usable bore

Record the cable count, outside diameters, largest connector, route length, and available space before choosing a nominal conduit size. Check the actual internal diameter and the bore through each fitting: a spacious conduit can still lead into a restrictive connector. Allow for pulling, bends, and future maintenance using the applicable installation rules. Send a route sketch with the inquiry, especially where cables enter a cabinet at an angle or must pass through a tight machine opening.

Separate installation flexibility from repeated movement

A conduit that bends easily during assembly is not automatically suitable for continuous machine motion. Describe whether the route remains fixed, vibrates, flexes occasionally, or moves during every operating cycle. Include the smallest bend radius and whether the movement introduces twisting. Ask for the selected construction's movement and fatigue information rather than judging a short sample by hand. When comparing samples, assemble the complete route with its supports and fittings so that the actual bending points are visible.

Choose the metal and outer construction together

Galvanized steel, stainless steel, an external jacket, and an overbraid answer different selection questions. The metal contributes to mechanical protection; the outer construction changes what directly encounters abrasion, liquids, or cleaning chemicals. ABB distinguishes liquid-resistant, liquidtight, superflexible, and overbraided systems, illustrating why a single description such as metal hose is insufficient. Define the real exposure, then request compatible material and construction options. For outdoor or corrosive service, specify the environment instead of assuming every stainless grade or jacket behaves identically.

Specify a complete conduit and fitting assembly

A procurement specification should identify both conduit and termination parts, including entry threads, straight or angled orientation, seals, and mounting arrangement. Request the relevant system evidence when ingress protection, bonding continuity, or electromagnetic screening matters. Do not derive those properties from a photograph or the presence of metal alone. For a DUCHUANG inquiry, provide the cable dimensions, route drawing, operating environment, movement description, requested test documentation, and order length. This gives the supplier a concrete basis for confirming an appropriate assembly.

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