PVC conduit question

[Colin33]

Hi all, I'm not so familiar with pvc conduit having used it very little in the past. However, I have a small workshop/man-cave to wire, it is attached to a small domestic dwelling. I need to wire this part using 20mm conduit.
I have a few questions:
1: Am I right in thinking I can wire multiple circuits together in the same conduit? (ie socket outlets and lighting)
2: Can I use a single cpc for all of these circuits or is it best practice to run separate?
3: If conduit is connected in and out of a socket outlet back-box, can other circuit conductors (ie for lighting) run through that back-box?
Thanks

 

[mainline]

Hi all, I'm not so familiar with pvc conduit having used it very little in the past. However, I have a small workshop/man-cave to wire, it is attached to a small domestic dwelling. I need to wire this part using 20mm conduit.
I have a few questions:
1: Am I right in thinking I can wire multiple circuits together in the same conduit? (ie socket outlets and lighting)
2: Can I use a single cpc for all of these circuits or is it best practice to run separate?
3: If conduit is connected in and out of a socket outlet back-box, can other circuit conductors (ie for lighting) run through that back-box?
Thanks

Is there a CU going in the garage ?
What earthing arrangement ?
Can you give some more info on the intended layout ?
Supply cable, rcd etc ?
I assume you're going to use single cables and not T&E.

 

[westward10]

1. Yes.
2. Yes but it needs sizing accordingly.
3. Yes but makes future maintenance difficult, not something I would do.

 

[Colin33]

Yes, supply via buried SWA from the main dwelling into new CU. The main house is TT. New CU to have RCBO on all circuits. The workshop area will have a lighting circuit, and two radial socket circuits in pvc conduit. The separate 'living area' in this building will have lighting circuit, water heating, and a ring final, a tiny bit of UFH and all in twin/earth buried in the studwork.