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Electrical Safety Exam 2024/2025 Questions With Completed & Verified Solutions.
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Electrical Safety Exam 2024/2025 Questions With Completed & Verified Solutions.
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Electrical SafetyA consumer unit or distribution board is used to: - ANS Provide distribution and overload
protection for final circuits
A main protective bonding conductor is used to: - ANS Connect extraneous conductive parts
(such as metal water pipes) to the main earthing terminal of the installation
A miniature circuit breaker (MCB) is used to: - ANS Provide overload and short circuit
protection for electrical circuits
A Permit to Work procedure is a formal written system used to control the work by means of
potential hazards identification and: - ANS A risk assessment
A permit-to-work system must be used: - ANS For all work on live electrical systems
A residual current device is designed to operate in the event of one of the following: - ANS
Earth fault
A rewireable fuse will carry an overload current of 50% more than the fuse rating for
approximately - ANS 3-4 hours
A risk assessment should be reviewed - ANS When any change to the task or environment
takes place
A risk assessment should include consideration of what in your business might cause harm and
how and, the people who might be affected. This should include: - ANS All people who might be
affected
A safe system of work is a formal procedure which results from systematic examination of a task
in order to identify all the hazards. It defines safe methods to ensure: - ANS "that hazards are
eliminated, or risks minimized"
A socket in an enclosure to IP 66 can be used for - ANS An outside installation
A standard (BS1363 or IEC60309) switched socket outlet is used to: - ANS To easily plug a
piece of equipment into the electrical supply
A switched fused connection unit is used to: - ANS Wire directly into the final circuit to feed a
piece of equipment
A test simulating a fault condition would be used when testing? - ANS Residual current devices
, An IEC60309 industrial connector is used in preference to a BS1363 square pin connector
when: - ANS For higher-current or 3-phase applications
Compared with low-current equipment, a piece of equipment that draws a large-current needs: -
ANS A larger cable
Earth fault loop impedance should be - ANS As low as possible
Extraneous-conductive-parts require protective equipotential bonding to ensure that? - ANS No
dangerous potential difference can occur
Fuses are preferable to Miniature Circuit Breakers (MCBs) when: - ANS Very high prospective
fault currents may occur
How do you calculate the current drawn by a single-phase mains-powered device given its
power rating - ANS Divide the power rating by 230V
If a fuse blows again after being replaced the correct procedure is - ANS Isolate the circuit or
device, then trace and rectify the fault
If the hazards of a task can not be eliminated then the next best control is: - ANS A safe system
of work
If you are asked to install a piece of electrical equipment that you have never seen before you
should: - ANS Do not install it and hand the work over to someone who has the correct
knowledge or experience.
IP codes are shorthand for International Protection Marking IEC Standard 60529, often referred
to as Ingress Protection. An IP code refers to an enclosures degree of protection provided
against intrusion of: - ANS Dust, water and accidental contact to electrical parts
It is a requirement of the Electricity at Work Regulations that No person shall be engaged in any
work activity where technical knowledge or experience is necessary to prevent danger or injury
unless: - ANS They possesses relevant knowledge and experience or is under appropriate
supervision.
Live conductor(s) in a single-phase circuit are defined as: - ANS Line (brown) and neutral (blue)
conductors
Low Voltage is defined in BS7617 as: - ANS AC voltage exceeding 50V AC but less than
1000V AC
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