Identify the electrical device primarily designed to disconnect a circuit during an 'Earth fault'.
MCB
RCD
BS88 Fuse
Cartridge fuse
Identify the electrical device primarily designed to disconnect a circuit during an 'Earth fault'.
MCB
RCBO
BS3036 Fuse
Cartridge fuse
Handtools must operate on a reduced voltage system. What is the maximum voltage of this system?
110v AC
110v DC
50v AC
50v DC
Reduced voltage systems for handtools on site are supplied by a transformer. What is the nature of the output voltage from the transformer.
it is 110v from a centre-tapped transformer
it is 110v to Earth
it is supplied at 55v DC for safety
it provides a safe DC voltage
Identify the maximum voltage from a RED coloured Industrial-type socket outlet.
400v AC - 3 phase
230v AC
50v AC
110v AC
Identify the maximum voltage from a BLUE coloured Industrial-type socket outlet.
400v AC - 3 phase
230v AC
50v AC
110v AC
Identify the maximum voltage from a YELLOW coloured Industrial-type socket outlet.
400v AC - 3 phase
230v AC
50v AC
110v AC
What colour is a 50v AC (reduced voltage) Industrial socket outlet.
Violet
White
Red
Green
The electrical flex used for worksite extension leads is especially resistant to very low temperatures. What name is given to this type of flex.
Zero flex
Artic cable
Arctic flex
Flexible cable
The flex used for worksite extension leads must be able to withstand temperatures......
as low as 5 degrees C
below zero degrees C
above 30 degrees C
at least 20 degrees C
During construction of a temporary site electrical distribution board (builders board), a means of recording the electricity usage on site is required by means of a meter. This meter will measure consumption in ...
kWh
Amps
Watts
Volts
Identify ANY of the following that may be required when constructing a worksite temporary electrical distribution board (builders board) - click all answers that apply.
Isolators
Switchgear
RCD protection
MCB protection
Amendment 2 of BS7671:2018 specifies specific requirements for Fuseboards installed in domestic premises. What is this requirement.
must be non-combustible
must be of combustible material
must be constructed of hardened p.v.c
must be located at least 1.5 metres above finished floor level
Identify the name of the component in a domestic fuseboard that supplies mains voltage to each m.c.b simultaneously.
switched live cable
busbar
main feed
neutral block
Identify the term used to state the number of circuits that can be fed from a single fuseboard.
ways
modules
circuits
gangs
Identify the term used to state the number of single-way devices that can be installed in a single fuseboard.
ways
modules
circuits
gangs
Some domestic fuseboards are fitted with more than 1 RCD to protect different parts of an installation. What name is given to this type of fuseboard.
split-load
half-load
dual-load
twin-load
Electrical equipment and accessories must meet IP (Ingress Protection) requirements. Identify the IP code that signifies protection against objects of 12.5mm or bigger.
IP2x
IP4x
IP65
IPxxW
Electrical equipment and accessories must meet IP (Ingress Protection) requirements. Identify the IP code that signifies protection against objects of 1mm or bigger.
IP2x
IP4x
IP65
IPxxB
Electrical equipment and accessories must meet IP (Ingress Protection) requirements. Identify the IP code that signifies protection against dust and jets of water from all directions.
IP2x
IP44
IP65
IPxxB
Electrical equipment and accessories must meet IP (Ingress Protection) requirements. What is signified by an 'x' in an IP code?.
no protection
full protection
not applicable
no protection against solid objects
Electrical equipment and accessories must meet IP (Ingress Protection) requirements. Identify the IP code that signifies specific protection against the ingress of a 12.5mm 'test' finger for a depth of up to 80mm.