in the case of audible warning devices receiving direct current a test voltage of 6,5, 13 or 26 volts, measured at the output side of the eletricity source and corresponding to a nominal voltage of 6, 12 or 24 volts respectively;
pri zvočnih opozorilnih napravah, ki jih napaja enosmerni tok, s preskusno napetostjo 6, 5, 13 ali 26 voltov, merjeno na izhodni strani električnega vira, kar ustreza nazivnim napetostim 6, 12 ali 24 voltov;