Kadar je vir tveganja lahko napačna priključitev, morajo biti napačni priključki za tekočine, vključno z električnimi vodniki, preprečeni z zasnovo, če to ni doseženo, pa z navodili na ceveh, kablih itd. in/ali priključnih sklopih.
Where a faulty connection can be the source of risk, incorrect fluid connections, including electrical conductors, must be made impossible by the design or, failing this, by information given on the pipes, cables, etc. and/or connector blocks.