Exposed-conductive parts connected to neutral –TN
Note :
In this system, the neutral from the transformer is connected to the earth ground and all metallic part of the equipment is connected to the neutral. There are two ways to connect the metallic part to the neutral: Through an earth wire connected to the neutral (TN-S) or connected directly to the neutral (TN-C).
System TN-S
System TN-C
Note :
An electric fault becomes a short circuit and circuit breaker or fuse will open the circuit. This system has to be well design to be sure of the efficiency of the security.
