The safety components shall be so designed as to make assembly mistakes impossible, either as a result of construction or by means of appropriate markings on the components themselves.
Déanfar na comhpháirteanna sábháilteachta a dhearadh ar bhealach nach mbeifear in ann botúin a dhéanamh leis an gcóimeáil, mar thoradh ar thógáil nó trí mharcálacha iomchuí ar na comhpháirteanna iad féin.