The protection against electric shock shall provided case high voltage equipment
and devices well case low voltage equipment. Even insulated parts high voltage
equipment shall protected against direct contact order avoid danger from leakage
currents dangerous electric charge these parts.
This protection can achieved one the following methods:
− preventing current from passing through the body any person any livestock;
− limiting the current which can pass through body value lower than the shock current. Let remind here:
6. This protection may achieved suitable
.1 Protection against direct contact
Persons and livestock shall protected against dangers that may arise from contact with
live parts the installation.
The protection against shock currents or, another words, the protection against electric
shock, was mentioned the preceding part.2.2.1. Rules for installation electrical equipment (apparatus and appliances)
By designing and mounting any electrical installation some basic rules shall followed.
6.
For the design the electrical installation the main aspects are subordinated the aim to
provide:
− the protection persons, livestock, and property,
− the proper functioning the electrical installation for the use intended.
In electrical installation, two major types risk exist:
− shock currents,
− excessive temperatures likely cause burns, fires, etc.2.
We shall pay attention the prevention danger that may arise when the installation not
designed and mounted properly.CONSTRUCTION ELECTRICAL INSTALLATION AND EQUIPMENT
58
6.1.2 Protection against indirect contact
Persons and livestock shall protected against dangers that may arise from contact with
exposed conductive parts case fault.
In connection with the protection against indirect contact, the application the method of
equipotential bonding one the important principles for safety.
This protection can achieved one the following methods:
− preventing fault current from passing through the body any person any livestock;
− limiting the fault current which can pass through body value lower than the shock
current;
− automatic disconnection the supply determined time the occurrence fault likely
to cause current flow through body contact with exposed conductive parts, where the
value that current equal greater than the shock current
