Grounding metal garden room

[Adiy24]

Hello,

I'm building a garden room metal sandwich panels (

). I'm gonna bring an SWA cable from the house to supply power. Do I have to ground every single panel, floor and ceiling or it's fine to just ground the metal boxes I'm gonna use for the sockets? Would you recommend TT rather than TN-C-S from the house?

 

[ericmark]

Not permitted TN-C-S in a building similar to a caravan, TT is only option.

 

[Adiy24]

Thanks. What about grounding the panels?

 

[morqthana]

What does the supplier of the building kit say?

 

[Adiy24]

To ask on diynot.com