What is NOT a requirement for basic protection as per 411.2?

Compliance with one of the provisions for basic protection described in Section 416

What does an RCM produce when a preselected value of residual current is reached, as noted in the NOTE under 411.1?

Both an audible and visual signal

A physical disconnection of the circuit

Which of the following is NOT listed as an example of extraneous-conductive-parts in Regulation 411.3.1.2?

Plastic water installation pipes

Metallic water installation pipes

Metallic gas installation pipes

Overhead metallic structural parts of the building

According to the note in Regulation 411.3.1.2, when are non-metallic pipes within a building that are connected to metallic pipes unlikely to require protective bonding?

When they do not normally require protective bonding as they are unlikely to be extraneous-conductive-parts

When they enter a building and are not connected to metallic pipes

When they are used for gas installation only

When they are connected to the main earthing terminal

What must be obtained if an installation serves more than one building and the above requirement shall be applied to each building, as per the text?

Consent of the owner or operator of the cable

A detailed report of the installation

Approval from the local government

A new cable installation permit

What is the maximum disconnection time stated in Table 41.1 for final circuits with a rated current not exceeding 32 A supplying only fixed connected current-using equipment?

It is not specified in the provided text

There is no maximum disconnection time specified

The same as for circuits with a rated current of 63 A with one or more socket-outlets

It is provided in Regulation 411.3.2.2

What additional protection is required for socket-outlets with a rated current not exceeding 32 A in locations where they are liable to be used by persons of any age, by BA1, BA3 or children (BA2, BA3)?

RCD with a rated residual operating current not exceeding 30 mA

RCD with a rated residual operating current not exceeding 32 A

RCD with a rated residual operating current not exceeding 5 s

No additional protection is required

Which of the following is an exception to the requirement of additional protection by means of an RCD for socket-outlets used outdoors?

Socket-outlets where a suitably documented risk assessment undertaken with the involvement of a skilled person (electrically) determines that RCD protection is not necessary

Socket-outlets with a rated current not exceeding 32 A in other locations

Mobile equipment with a rated current not exceeding 32 A for use outdoors

All socket-outlets require RCD protection without exception

What is the primary factor on which the integrity of the earthing of the installation in a TN system depends?

The reliability and effective connection of the PEN or PE conductors to Earth

The type of electrical devices used

The distance between the electrical installation and the power supply

The brand of the electrical installation components

In a TN system, if the neutral point or midpoint of the power supply system is not available or accessible, what should be done?

A line conductor should be earthed

A protective device should be installed

The system should be converted to a different type of earthing system

The installation should operate without earthing

Under what condition can a single conductor serve both as a protective conductor and as a neutral conductor in a fixed installation?

If the requirements of Regulation 543.4 are satisfied

If the installation is in an outbuilding of a dwelling

If the installation uses RCDs exclusively for fault protection

If the installation is temporary

What is Zs in the context of the characteristics of the protective devices and circuit impedances?

The impedance in ohms (Ω) of the fault loop comprising

The nominal AC rms or ripple-free DC line voltage to Earth

The protective conductor between the point of the fault and the source

Which of the following types of protective device may be used for fault protection according to Regulation 411.4.5?

An overcurrent protective device

According to the note in Table 41.3, when should the circuit loop impedances not exceed the values given in the table?

When the line conductors are at the appropriate assumed initial temperature.

When the line conductors are at the appropriate maximum permitted operating temperature.

When the line conductors are at the initial assumed temperature.

When the line conductors are at a different temperature than tested.

According to Note 2, when should the circuit loop impedances given in the table not be exceeded?

When the circuit protective conductors are not at the appropriate assumed initial temperature.

When the circuit conductors are at the appropriate maximum permitted operating temperature.

When the circuit conductors are at a temperature below the maximum permitted operating temperature.

When the circuit protective conductors are at the appropriate assumed initial temperature.

What types of protective device shall be used according to 411.5.2, with one being preferred over the other?

An RCD and an overcurrent protective device

An overcurrent protective device and a voltage regulator

In an IT system, live parts shall be insulated from Earth or connected to Earth through what means to handle a high impedance fault?

A) A sufficiently high resistance

B) A direct connection to the neutral point or midpoint of the system

C) An artificial neutral impedance

Which of the following monitoring devices and protective devices may be used in IT systems according to 411.6.3?

A) Insulation monitoring devices (IMDs)

B) Residual current monitoring devices (RCMs)

C) Insulation fault location systems (IFLS)

If an IT system is designed not to disconnect in the event of a first fault, what should indicate the occurrence of the first fault?

C) A visual and/or audible alarm system

A) An insulation monitoring device (IMD)

B) A residual current monitor (RCM)

What additional system may be provided to indicate the location of a first fault from a live part to exposed-conductive-parts or Earth according to 411.6.4?

A) An insulation fault location system according to BS EN 61557-9

B) A residual current device (RCD)

C) A touch voltage limitation device

Electrical Safety Quiz CH41

Quiz

•

Education

•

12th Grade

•

Practice Problem

•

Hard

Chris Barlow

FREE Resource

Basic insulation of live parts

Supplementary bonding connections

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