Bonding steel conduit around plastic switch

[JosephandAmber]

Any recommendations? I have 25mm steel conduit going into 20mm reducers feeding a plastic time guard switch and then returning to steel conduit again on the other side. An earthing nut is too chunky. I think I need those smaller flat brass plates you get on SWA cables.
[automerge]1588093418[/automerge]
Found them - earth tags. 20mm Earth Tag (Sold in 1's) - https://www.cef.co.uk/catalogue/products/23235-20mm-earth-tag-sold-in-1-s

 

[littlespark]

Is there a cpc in the conduit?

can a metal box be used instead of the plastic? Should come in the same sizes (standard one gang?)

 

[westward10]

Does it need earthing across the switch. Assuming the incoming conduit is earthed a separate cpc through the switch can pick up the outgoing conduit further along at an accessory.

 

[StephenRowley]

How about a sutable sized earthing nut and a fly lead?

 

[radiohead]

If you have to use a plastic box for the timer I'd run the steel conduits into a galv adaptable box and bush the plastic box into the side of it.

 

[JosephandAmber]

If you have to use a plastic box for the timer I'd run the steel conduits into a galv adaptable box and bush the plastic box into the side of it.

I agree this is the best method. Unfortunately, I've already hit the knockouts but lesson learnt.