Kjer iz tehničnih razlogov ni mogoče pritrditi delov tako, kakor je opisano v pododstavku (a) tega obvestila, so lahko sestavni deli spojeni s pripomočki, navedenimi v pododstavku (c) tega obvestila, pod pogojem, da pripomočki, ki se uporabljajo na notranji strani stene, niso dostopni z zunanje strani.
Where, due to technical reasons, it is not practicable to secure parts in the manner described in subparagraph (a) of this note, the constituent parts may be joined by means of the devices mentioned in subparagraph (c) of this note provided that the devices used on the inner face of the wall are not accessible from the outside.