1
Indirect contact and protection case fault
.
5.
Figure 5.2).FUNDAMENTAL RULES FOR PROTECTION AGAINST ELECTRIC SHOCK
34
However, the case fault, when current flows from the live conductors the earthed
casing, enclosure frame, i. This difference called
residual-current.e.2.1)
All electrical equipment shall provided with foreseen for one the measures against
indirect contact (see Table 5.2.2. the earthed exposed conductive parts or, the case very
sensitive residual-current protective device when current flows through the human body the
earth the protective conductor, there will difference current. Protection against indirect contact
"Indirect contact" the contact persons livestock with exposed conductive parts which
have become live under fault conditions (see Figure 5.2.1)
Protection against indirect contact requires correspondence measures electrical
equipment and measures electrical installation (see Table 5.2. The residual-current protective device must ensure the disconnection all live
conductors the circuit, including the neutral conductor. This ensured through the operation
of trip coil through which current from differential current transformer flows
