What provides both basic and fault protection?

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.

How do you provide fault protection?

Fault protection can be achieved by automatic disconnection of the supply if the exposed-conductive-parts of equipment are properly earthed.

What are the two systems that provide basic and fault protection for extra low voltage installations?


  • Use of SELV (Safety Extra-Low Voltage)
  • Use of PELV (Protection by Extra Low Voltage)
  • FELV system (Functional Extra-Low Voltage)

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.

What is basic and fault protection?

Protective measures

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.

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What is classed as basic protection?

The basic means of protection is the insulation between live parts and exposed conductive parts such as the metal enclosure. In the event of a fault that would otherwise cause an exposed conductive part to become live, the supplementary protection (i.e. the protective earth) comes into effect.

What’s the difference between fault protection and additional protection?

The fault protection refers to cases like TT were the max Zs cannot be met so in a TNCS situation the RCD would not generally be required for fault protection because the Zs readings would be within limits. Additional protection is that extra bit of safety for sockets outside for eg.

What protects from electric shock?

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.

Which is the most common form of protection against faults in electrical installations?

Automatic disconnection of supply (ADS), is typically used in most electrical installations as a means of providing protection from electric shock and is made up of two parts; basic protection and fault protection. Basic protection is a preventive measure against coming into contact with live parts.

Does basic insulation offer protection from indirect contact?

Protective obstacle: part preventing unintentional direct contact, but not preventing direct contact by deliberate action. Basic insulation: insulation of hazardous-live-parts which provides basic protection.

Why is electrical protection required?

Why are circuit protective devices important? Protective devices are important because they ensure that under fault conditions, a high fault current cannot flow – as well as protecting the installation this, more importantly, ensures that consumers are not injured or killed as a result of an electrical fault.

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