A sealing grommet must close the relevant paths around both the panel opening and the cable. An open edge-protection grommet should not be assumed to make an enclosure waterproof.
Measure the sealing interfaces
Record the dimensions of your cable-routing hole, panel thickness and cable outside diameter. Check that they fall within the selected part's specified ranges. Cable shape and surface condition can also affect the seal.
Define the exposure
Specify the required ingress protection and conditions such as splashing, spray or immersion. Request the applicable test evidence and verify that it covers the intended assembly. A close visual fit is not proof of a rating.
For multiple cables, use a sealing arrangement intended for that configuration. Choose the compound for temperature and fluid exposure. Custom parts are reviewed from customer drawings or existing samples with agreed performance requirements.
