For example, in the case of automatic disconnection of supply, basic protection is provided by insulation and barriers and enclosures while fault protection is provided by protective earthing, protective bonding and automatic disconnection of supply. Basic and fault protection are independent.
What is basic protection?
Basic protection is defined as: Protection against electric shock under. fault-free conditions. … In plain language this means that fault protection provides us with protection against receiving an electric shock from conductive parts that are not intended to be live but have become live due to a fault.
What is the fault protection?
The earthing of all exposed-conductive-parts of electrical equipment in the installation and the constitution of an equipotential bonding network (see Protective earthing conductor (PE) )
What is the most common form of fault protection?
The requirements for protective earthing, protective equipotential bonding and automatic disconnection in case of fault should be satisﬁed. For domestic premises, earth fault loop impedance testing is the most common method used to verify circuit disconnection.
What are the requirements for fault protection?
Methods of Fault Protection
- Earthing of circuits and equipment.
- Protective equipotential bonding.
- Automatic disconnection.
What is an example of protection?
Protection is a person or thing that shields from danger, pain or discomfort, or money paid to avoid violence or prosecution. An example of protection is an umbrella to stand under during a rainstorm. An example of protection is money paid by a shopowner to the mob to avoid violence.
Can water cause ground fault?
Ground faults can be caused by water leaking into a breaker box, damaged wires or appliances, poorly insulated or damaged wires, or even a build-up of debris within a box. Ground faults can lead to disastrous results such as electrical shock, fire, or burns.
What gives protection from shock when the appliance is touched?
(ii) The preventive measures to protect a person from an electric shock are the insulation of wire must be of good quality and it should be checked from time to time particularly when they become old, so that no wire is left naked.
How can basic protection be achieved?
Basic protection is required to prevent contact with live parts and is generally verified by inspection. In domestic premises, contact with live parts may occur as a result of damage to cable insulation or enclosures or because barriers are missing.
How can you protect against electrocution by direct contact?
A residual current device (RCD) can provide additional protection against direct contact. RCDs compare the sizes of the currents flowing in the live and neutral conductors of a circuit. In a healthy circuit, the currents will be equal.
What is overload protection?
Overload relays protect the motor, motor branch circuit, and motor branch circuit components from excessive heat from the overload condition. Overload relays are part of the motor starter (assembly of contactor plus overload relay). They protect the motor by monitoring the current flowing in the circuit.