The EEI 19 line safety circuit is of the “selective” type and has spread in recent years for the best performance.
Its characteristic is the use of many separate support circuits, each dedicated to a line support or to a remote station. This allow to clearly recognize the support or station that has detected an abnormal condition, or has issued a stop command, or is not functioning properly due to a fault.
If it is necessary, and with the appropriate procedures, the “selective” Circuit provides the exclusion of a Support Circuit hit by a fault, however despite the function of the other Support Circuits.
The system is intended to be used both for cableways that have a short route and few line supports, and for cableways up to 3 km long and 30 supports.
Each support is associated with a circuit with independent quiescent current: this is to be able to exclude a complete circuit of support, leaving the others running, and to identify where the irregular condition or a fault has occurred.