Is earthing a basic protection?
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.
What are the four common forms of basic protection against electric shock?
Protection against direct contact electric shock is based on normal common sense measures such as insulation of live parts, use of barriers or enclosures, protection by obstacles or protection by placing live parts out of reach.
What is meant by fault protection?
Fault protection requires the protective devices to operate within a specified time under fault conditions. Carrying out an earth fault loop impedance test is the most common method used for verifying circuit disconnection, although this may increase the risk of unnecessarily coming into contact with live parts.
Is Felv a means of basic protection?
Functional extra-low voltage (FELV)
Although the FELV part of a circuit uses an extra-low voltage, it is not adequately protected from accidental contact with higher voltages in other parts of the circuit. Therefore, the protection requirements for the higher voltage have to be applied to the entire circuit.
What is an octopus wiring?
It is the jam packing of wires on an outlet. It is when a cord or power extension is plugged into another power source directly inserted in the outlet thus creating an image of the octopus.
What is the full form of Elcb?
An Earth-leakage circuit breaker (ELCB) is a safety device used in electrical installations with high Earth impedance to prevent shock.
What is the purpose of basic protection?
Protection against direct contacts is called Basic Protection. Indirect Contacts: electric contact of persons or animals with exposedconductive-parts which have become live under fault conditions. I am subject to an indirect contact when I touch a metallic part that can become live due to a single fault.
What are electrical protection methods?
Protective shields, protective barriers, or insulating material must be used to protect employees from shock, burns, or other electrical related injuries while employees are working near exposed energized parts which might be contacted or where dangerous electric heating or arcing might occur.
What are the two basic circuit protection devices?
There are two general categories of circuit protection: 1) Fuses 2) Electro-mechanical circuit breakers.
Is insulation basic protection?
Very little steel conduit. Basic insulation: ‘ insulation applied to live parts to provide basic protection and which does not necessarily include insulation used exclusively for functional purposes.
Is SELV basic or fault protection?
The Separated Extra Low Voltage (SELV) systems can be thought of as having a protective partition from the other higher voltage systems. Combining the low voltage, basic insulation, and protective separation makes SELV systems one of the safest electrical systems.
What form of protection is offered by SELV?
The SELV systems must have protective-separation such as reinforced insulation, double insulation or protective screening from all circuits carrying higher voltages. The SELV cables must be double insulated or pass through plastic conduits especially when they are likely to come into contact with other circuits.
What is the difference between SELV and FELV?
If a separated extra-low voltage (SELV) system is earthed, or if the insulation of the supply which feeds it does not meet the necessary requirements, it ceases to be a SELV system and becomes a functional extra-low voltage (FELV) system.