I am trying to better understand the requirements of BS7671 in relation to practical installation of wiring in an timber outbuilding.  422.4.201 states that Electrical equipment (boxes etc) installed on or in a combustible material shall comply with the relevant standard for enclosure temperature rise. Can anyone help me understand what that standard is? I can't find any further information that helps me understand what is needed to be compliant. Is there a particular product approval that would mean this is satisfied?

I would appreciate any help in this.

Thanks

Mike