Since a certain voltage of electric current is constantly applied to the telephone wiring, increasing when the phone rings, it is dangerous to touch the inside of a junction box or the metal parts connected to it.
Tā kā tālruņa līnija ir zem sprieguma, kas pieaug, tālrunim iezvanoties, nav ieteicams kaut ko aiztikt sadales skapī un skarties klāt metāla detaļām, kas ar to ir savienotas.