A steel gland that directy contacts the mesh (screen or armour) on the cable and is fastened through the metal box is the ideal solution. No other connection to the mesh / screen is required in this case. The matal case must of course be connected to mains earth. The inside of the box under the gland nutsmust be free of paint or similar finishes.
If you use a plastic gland on the box then leave the mesh and outer insulation intact up to within a few inches of the VFD. One good way to earth the screen in this case is to use a 15mm compression fitting for water pipe. Fold the mesh over the olive and clamp it with the nut. Iflike most, the olive has a sharp edge break it with a file so it doesn't cut the mesh. Mount the fitting on a angle bracket fastened ot the same metal plate / box wall as the VFD.
The plumbing fitting trick is not good for the outside of the box because it does not provide mechanical support for the cable.

Robert.

I don't know the gland design , but from a EMC performance respect that is perfect. You just need to make sure it has adequate mechanocal support.

Chris, whilst the brass gland will provide screening it may not give good mechanical support. If the cables are otherwise fixed this may not matter. The type of gland used appears to be made for SWA (steel wire armoured) cable where the armouring is of much heavier steel wire galvanised, this may account for the loose fit. Noel

I agree with SOD on input cable.
Earth block is OK as long as it is fastened directly the metal plate / box the VFD is mounted on.

Robert.

.

That looks tidy, and very useful, Chris

Could you share the Part Number please ?

MichaelG.

Thanks for that, Chris

MichaelG.

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https://unicrimp.com/product/QCXT20S

Edited By Michael Gilligan on 15/09/2023 07:50:23

A small point , but when fitting wire into a hole rather larger than the wire, bend the wire back over to double it's thickness, this will give the screws more to bite on. The box looks as though it's powder coat , it is vital that ANY coating(or paint ) is remover from under screws, bolts Etc to ensure sound connection. In this case round the earth bolt and copper washer for screen fixing.  Noel.

Edited By noel shelley on 15/09/2023 11:04:21

Small perfectionist point, as Chris is doing a better than average installation, I suggest clipping the screen pig-tails from the gland and carefully removing the remains:

Terminating the screen wires and tightening the gland can cause a few damaged strands to eventually break loose, perhaps much later after the cabinet has been warmed cooled and vibrated by using the lathe. Tidying up the pigtail and carefully removing the remains reduces the risk.

Another booby trap: check that the gland really is earthed to the box. Metal to metal contact is required and a thick coat of paint is a good insulator. You can guess how I know!

Dave