It is possible to run VFD cables in conduits, but the following key considerations apply:
- Shielding: VFD cables can generate electromagnetic interference (EMI) when operating at high frequencies. Using metal conduits, such as steel pipes, can further enhance shielding and reduce interference, especially for sensitive control signals or other nearby cables.
- Cooling requirements: Shielded VFD cables can generate a lot of heat when in operation, and the limited space in the conduit for heat dissipation may cause the cable temperature to rise. Therefore, ensure that there is sufficient air circulation inside the conduit, or choose a larger conduit when the cooling requirement is high.
- Grounding treatment: The metal shield of the conduit should be properly connected to the grounding shield system of the VFD spindle cable to provide a continuous grounding path to optimize electromagnetic shielding performance.
- Bending radius: When laying out VFD motor cable, care should be taken to keep their bending radius within the manufacturer's recommended range to prevent cable damage, especially when installed in conduits.
In general, laying VFD cables in metal conduits can provide additional electromagnetic shielding protection and mechanical protection, but proper heat dissipation and grounding conditions must be ensured to extend the service life of the cable and ensure system stability.
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